A bstract In this work, we obtain the current limits on the pair production of vectorlike leptons decaying to a Standard Model gauge boson and a lepton in the second generation using the Run-2 data at the LHC. Since there is no dedicated search out of Run-2 data, we recast the ATLAS analyses searching for the type-III seesaw heavy leptons in the multi-lepton channels. There is no limit for the SU(2) L singlet vectorlike lepton beyond about 100 GeV, while the limit is about 780 GeV for the doublet one. Thus, dedicated searches for the vectorlike leptons are necessary, especially for the singlet one. We also study the general cases of the vectorlike lepton decays and future sensitivities at the HL-LHC.
{"title":"Current status on pair-produced muon-philic vectorlike leptons in multilepton channels at the LHC","authors":"Junichiro Kawamura, Seodong Shin","doi":"10.1007/jhep11(2023)025","DOIUrl":"https://doi.org/10.1007/jhep11(2023)025","url":null,"abstract":"A bstract In this work, we obtain the current limits on the pair production of vectorlike leptons decaying to a Standard Model gauge boson and a lepton in the second generation using the Run-2 data at the LHC. Since there is no dedicated search out of Run-2 data, we recast the ATLAS analyses searching for the type-III seesaw heavy leptons in the multi-lepton channels. There is no limit for the SU(2) L singlet vectorlike lepton beyond about 100 GeV, while the limit is about 780 GeV for the doublet one. Thus, dedicated searches for the vectorlike leptons are necessary, especially for the singlet one. We also study the general cases of the vectorlike lepton decays and future sensitivities at the HL-LHC.","PeriodicalId":48906,"journal":{"name":"Journal of High Energy Physics","volume":"71 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135684938","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A bstract Time and space translation invariance, giving rise to energy and momentum conservation, are not only amongst the most fundamental but also the most generally accepted symmetry assumptions in physics. It is nevertheless prudent to put such assumptions to experimental and observational tests. In this note, we take the first step in this direction, specifying a simple periodic time dependence that violates time translation invariance in QED, and setting phenomenological constraints on it. In addition to observational and experimental constraints on time varying couplings, we focus on probes of violation of energy conservation such as spontaneous production of photon and electron pairs and the e → eγ process. We discuss similarities and differences to the discussion of time varying fundamental constants and to the case of a light bosonic dark matter field that usually also causes oscillating effects.
{"title":"Probing Poincaré violation","authors":"Rick Gupta, Joerg Jaeckel, Michael Spannowsky","doi":"10.1007/jhep11(2023)026","DOIUrl":"https://doi.org/10.1007/jhep11(2023)026","url":null,"abstract":"A bstract Time and space translation invariance, giving rise to energy and momentum conservation, are not only amongst the most fundamental but also the most generally accepted symmetry assumptions in physics. It is nevertheless prudent to put such assumptions to experimental and observational tests. In this note, we take the first step in this direction, specifying a simple periodic time dependence that violates time translation invariance in QED, and setting phenomenological constraints on it. In addition to observational and experimental constraints on time varying couplings, we focus on probes of violation of energy conservation such as spontaneous production of photon and electron pairs and the e → eγ process. We discuss similarities and differences to the discussion of time varying fundamental constants and to the case of a light bosonic dark matter field that usually also causes oscillating effects.","PeriodicalId":48906,"journal":{"name":"Journal of High Energy Physics","volume":"14 8","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135684184","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A bstract Kerr-AdS d +1 black holes for d ≥ 3 suffer from classical superradiant instabilities over a range of masses above extremality. We conjecture that these instabilities settle down into Grey Galaxies (GGs) — a new class of coarse-grained solutions to Einstein’s equations which we construct in d = 3. Grey Galaxies are made up of a black hole with critical angular velocity ω = 1 in the ‘centre’ of AdS, surrounded by a large flat disk of thermal bulk gas that revolves around the centre of AdS at the speed of light. The gas carries a finite fraction of the total energy, as its parametrically low energy density and large radius are inversely related. GGs exist at masses that extend all the way down to the unitarity bound. Their thermodynamics is that of a weakly interacting mix of Kerr-AdS black holes and the bulk gas. Their boundary stress tensor is the sum of a smooth ‘black hole’ contribution and a peaked gas contribution that is delta function localized around the equator of the boundary sphere in the large N limit. We also construct another class of solutions with the same charges; ‘Revolving Black Holes (RBHs)’. RBHs are macroscopically charged SO( d, 2) descendants of AdS-Kerr solutions, and consist of ω = 1 black holes revolving around the centre of AdS at a fixed radial location but in a quantum wave function in the angular directions. RBH solutions are marginally entropically subdominant to GG solutions and do not constitute the endpoint of the superradiant instability. Nonetheless, we argue that supersymmetric versions of these solutions have interesting implications for the spectrum of supersymmetric states in, e.g. $$ mathcal{N} $$ N = 4 Yang-Mills theory.
d≥3的抽象Kerr-AdS d +1黑洞在极值以上的质量范围内具有经典超辐射不稳定性。我们推测，这些不稳定性会沉淀到灰色星系(gg)中——这是我们在d = 3中构造的爱因斯坦方程的一类新的粗粒度解。灰色星系是由一个临界角速度为ω = 1的黑洞组成的，黑洞位于AdS的“中心”，周围是一个巨大的扁平热块状气体盘，以光速围绕AdS中心旋转。气体携带的总能量的有限部分，因为它的参数低能量密度和大半径成反比。黑洞存在的质量一直延伸到统一界。它们的热力学是Kerr-AdS黑洞和大量气体弱相互作用的混合物。它们的边界应力张量是平滑的“黑洞”贡献和峰值气体贡献的总和，峰值气体贡献是在大N极限下边界球赤道附近的三角函数。我们还构造了另一类具有相同电荷的解;旋转黑洞(RBHs)。RBHs是AdS- kerr解的宏观带电SO(d, 2)后代，由ω = 1的黑洞组成，它们以固定的径向位置围绕AdS中心旋转，但在角方向上以量子波函数旋转。相对于GG解，RBH解在熵上是次要的，并且不构成超辐射不稳定性的终点。尽管如此，我们认为这些解的超对称版本对超对称态的谱有有趣的含义，例如$$ mathcal{N} $$ N = 4 Yang-Mills理论。
{"title":"Grey Galaxies’ as an endpoint of the Kerr-AdS superradiant instability","authors":"Seok Kim, Suman Kundu, Eunwoo Lee, Jaeha Lee, Shiraz Minwalla, Chintan Patel","doi":"10.1007/jhep11(2023)024","DOIUrl":"https://doi.org/10.1007/jhep11(2023)024","url":null,"abstract":"A bstract Kerr-AdS d +1 black holes for d ≥ 3 suffer from classical superradiant instabilities over a range of masses above extremality. We conjecture that these instabilities settle down into Grey Galaxies (GGs) — a new class of coarse-grained solutions to Einstein’s equations which we construct in d = 3. Grey Galaxies are made up of a black hole with critical angular velocity ω = 1 in the ‘centre’ of AdS, surrounded by a large flat disk of thermal bulk gas that revolves around the centre of AdS at the speed of light. The gas carries a finite fraction of the total energy, as its parametrically low energy density and large radius are inversely related. GGs exist at masses that extend all the way down to the unitarity bound. Their thermodynamics is that of a weakly interacting mix of Kerr-AdS black holes and the bulk gas. Their boundary stress tensor is the sum of a smooth ‘black hole’ contribution and a peaked gas contribution that is delta function localized around the equator of the boundary sphere in the large N limit. We also construct another class of solutions with the same charges; ‘Revolving Black Holes (RBHs)’. RBHs are macroscopically charged SO( d, 2) descendants of AdS-Kerr solutions, and consist of ω = 1 black holes revolving around the centre of AdS at a fixed radial location but in a quantum wave function in the angular directions. RBH solutions are marginally entropically subdominant to GG solutions and do not constitute the endpoint of the superradiant instability. Nonetheless, we argue that supersymmetric versions of these solutions have interesting implications for the spectrum of supersymmetric states in, e.g. $$ mathcal{N} $$ <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"> <mml:mi>N</mml:mi> </mml:math> = 4 Yang-Mills theory.","PeriodicalId":48906,"journal":{"name":"Journal of High Energy Physics","volume":"8 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135680023","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Admir Greljo, Jakub Salko, Aleks Smolkovič, Peter Stangl
A bstract Exclusive semileptonic b hadron decays ( b → uℓν ) serve as a sandbox for probing strong and electroweak interactions and for extracting the CKM element V ub . Instead, this work investigates their underexplored potential to reveal new short-distance physics. Utilizing SMEFT as a conduit to chart territory beyond the SM, we demonstrate that substantive new physics contributions in b → uℓν are necessarily linked to correlated effects in rare neutral-current b decays, neutral B meson mixing or high-mass Drell-Yan tails. We find that measurements of the latter processes strongly restrict the allowed deviations in the former. A complete set of tree-level mediators, originating from a perturbative ultraviolet model and matching at dimension 6, is thoroughly explored to support this assertion. As a showcase application, we examine the feasibility of a new physics interpretation of the recent tension in exclusive |V ub | extraction from B → Vℓν where V = ( ρ, ω ).
{"title":"SMEFT restrictions on exclusive b → uℓν decays","authors":"Admir Greljo, Jakub Salko, Aleks Smolkovič, Peter Stangl","doi":"10.1007/jhep11(2023)023","DOIUrl":"https://doi.org/10.1007/jhep11(2023)023","url":null,"abstract":"A bstract Exclusive semileptonic b hadron decays ( b → uℓν ) serve as a sandbox for probing strong and electroweak interactions and for extracting the CKM element V ub . Instead, this work investigates their underexplored potential to reveal new short-distance physics. Utilizing SMEFT as a conduit to chart territory beyond the SM, we demonstrate that substantive new physics contributions in b → uℓν are necessarily linked to correlated effects in rare neutral-current b decays, neutral B meson mixing or high-mass Drell-Yan tails. We find that measurements of the latter processes strongly restrict the allowed deviations in the former. A complete set of tree-level mediators, originating from a perturbative ultraviolet model and matching at dimension 6, is thoroughly explored to support this assertion. As a showcase application, we examine the feasibility of a new physics interpretation of the recent tension in exclusive |V ub | extraction from B → Vℓν where V = ( ρ, ω ).","PeriodicalId":48906,"journal":{"name":"Journal of High Energy Physics","volume":"17 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135680060","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A bstract Neutral particles capable of travelling cosmic distances from a source to detectors on Earth are limited to photons and neutrinos. Examination of the Dark Matter annihilation/decay spectra for these particles reveals the presence of continuum spectra (e.g. due to fragmentation and W or Z decay) and peaks (due to direct annihilations/decays). However, when one explores extensions of the Standard Model (BSM), unexplored spectra emerge that differ significantly from those of the Standard Model (SM) for both neutrinos and photons. In this paper, we argue for the inclusion of important spectra that include peaks as well as previously largely unexplored entities such as boxes and combinations of box, peak and continuum decay spectra.
{"title":"New energy spectra in neutrino and photon detectors to reveal hidden dark matter signals","authors":"Wim Beenakker, Sascha Caron, Jochem Kip, Roberto Ruiz de Austri, Zhongyi Zhang","doi":"10.1007/jhep11(2023)028","DOIUrl":"https://doi.org/10.1007/jhep11(2023)028","url":null,"abstract":"A bstract Neutral particles capable of travelling cosmic distances from a source to detectors on Earth are limited to photons and neutrinos. Examination of the Dark Matter annihilation/decay spectra for these particles reveals the presence of continuum spectra (e.g. due to fragmentation and W or Z decay) and peaks (due to direct annihilations/decays). However, when one explores extensions of the Standard Model (BSM), unexplored spectra emerge that differ significantly from those of the Standard Model (SM) for both neutrinos and photons. In this paper, we argue for the inclusion of important spectra that include peaks as well as previously largely unexplored entities such as boxes and combinations of box, peak and continuum decay spectra.","PeriodicalId":48906,"journal":{"name":"Journal of High Energy Physics","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135682376","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A bstract The photoproduction of P -wave doubly charmed baryon (Ξ cc ) is investigated in the context of future high-energy and high-luminosity e + e − colliders. The direct photoproduction via the sub-process $$ gamma +gamma to {Xi}_{cc}+overline{c}+overline{c} $$ γ+γ→Ξcc+c¯+c¯ and the resolved channel $$ gamma +gto {Xi}_{cc}+overline{c}+overline{c} $$ γ+g→Ξcc+c¯+c¯ are considered. Within the framework of non-relativistic QCD, the calculation encompasses four P -wave ( cc )-diquark configurations: $$ {(cc)}_{overline{textbf{3}}} $$ cc3¯ [ 1 P 1 ], ( cc ) 6 [ 3 P 0 ], ( cc ) 6 [ 3 P 1 ] and ( cc ) 6 [ 3 P 2 ]. The two S -wave states, $$ {(cc)}_{overline{textbf{3}}} $$ cc3¯ [ 3 S 1 ] and ( cc ) 6 [ 1 S 0 ], are also included for comparison. The cross sections, as well as the differential distributions involving transverse momentum, rapidity, and angular variables, have been computed. Numerical results reveal that the resolved photoproduction process plays a significant role and can provide dominant contributions. The photoproduction rate of the P -wave Ξ cc is approximately one order of magnitude lower than that of the S -wave.
在未来高能高亮度e + e−对撞机的背景下，研究了P波双粲重子(Ξ cc)的光产生。考虑了通过子过程$$ gamma +gamma to {Xi}_{cc}+overline{c}+overline{c} $$ γ + γ→Ξ cc + c¯+ c¯和解析通道$$ gamma +gto {Xi}_{cc}+overline{c}+overline{c} $$ γ + g→Ξ cc + c¯+ c¯的直接光生产。在非相对论性QCD的框架内，计算包括四种P波(cc)-双夸克构型:$$ {(cc)}_{overline{textbf{3}}} $$ cc 3¯[1 p1]， (cc) 6 [3 p1]， (cc) 6 [3 p2]和(cc) 6 [3 p2]。两种S波状态，$$ {(cc)}_{overline{textbf{3}}} $$ cc 3¯[3 S 1]和(cc) 6 [1 S 0]，也包括在其中进行比较。横截面，以及微分分布涉及横向动量，速度，和角变量，已经计算。数值结果表明，分辨光产生过程起着重要的作用，可以提供主导的贡献。P波Ξ cc的光产生率比S波的光产生率大约低一个数量级。
{"title":"Photoproduction of P-wave doubly charmed baryon at future e+e− collider","authors":"Xi-Jie Zhan, Xing-Gang Wu, Xu-Chang Zheng","doi":"10.1007/jhep11(2023)029","DOIUrl":"https://doi.org/10.1007/jhep11(2023)029","url":null,"abstract":"A bstract The photoproduction of P -wave doubly charmed baryon (Ξ cc ) is investigated in the context of future high-energy and high-luminosity e + e − colliders. The direct photoproduction via the sub-process $$ gamma +gamma to {Xi}_{cc}+overline{c}+overline{c} $$ <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"> <mml:mi>γ</mml:mi> <mml:mo>+</mml:mo> <mml:mi>γ</mml:mi> <mml:mo>→</mml:mo> <mml:msub> <mml:mi>Ξ</mml:mi> <mml:mi>cc</mml:mi> </mml:msub> <mml:mo>+</mml:mo> <mml:mover> <mml:mi>c</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> <mml:mo>+</mml:mo> <mml:mover> <mml:mi>c</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> and the resolved channel $$ gamma +gto {Xi}_{cc}+overline{c}+overline{c} $$ <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"> <mml:mi>γ</mml:mi> <mml:mo>+</mml:mo> <mml:mi>g</mml:mi> <mml:mo>→</mml:mo> <mml:msub> <mml:mi>Ξ</mml:mi> <mml:mi>cc</mml:mi> </mml:msub> <mml:mo>+</mml:mo> <mml:mover> <mml:mi>c</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> <mml:mo>+</mml:mo> <mml:mover> <mml:mi>c</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> are considered. Within the framework of non-relativistic QCD, the calculation encompasses four P -wave ( cc )-diquark configurations: $$ {(cc)}_{overline{textbf{3}}} $$ <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"> <mml:msub> <mml:mfenced> <mml:mi>cc</mml:mi> </mml:mfenced> <mml:mover> <mml:mn>3</mml:mn> <mml:mo>¯</mml:mo> </mml:mover> </mml:msub> </mml:math> [ 1 P 1 ], ( cc ) 6 [ 3 P 0 ], ( cc ) 6 [ 3 P 1 ] and ( cc ) 6 [ 3 P 2 ]. The two S -wave states, $$ {(cc)}_{overline{textbf{3}}} $$ <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"> <mml:msub> <mml:mfenced> <mml:mi>cc</mml:mi> </mml:mfenced> <mml:mover> <mml:mn>3</mml:mn> <mml:mo>¯</mml:mo> </mml:mover> </mml:msub> </mml:math> [ 3 S 1 ] and ( cc ) 6 [ 1 S 0 ], are also included for comparison. The cross sections, as well as the differential distributions involving transverse momentum, rapidity, and angular variables, have been computed. Numerical results reveal that the resolved photoproduction process plays a significant role and can provide dominant contributions. The photoproduction rate of the P -wave Ξ cc is approximately one order of magnitude lower than that of the S -wave.","PeriodicalId":48906,"journal":{"name":"Journal of High Energy Physics","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135679466","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A bstract Through the calculation of the matrix element of the singlet axial-current operator between the vacuum and a pair of gluons in dimensional regularization with an anti-commuting γ 5 defined in a Kreimer-scheme variant, we find that additional renormalization counter-terms proportional to the Chern-Simons current operator are needed starting from $$ mathcal{O} $$ O ( $$ {alpha}_s^2 $$ αs2 ) in QCD. This is in contrast to the well-known purely multiplicative renormalization of the singlet axial-current operator defined with a non-anticommuting γ 5 . Consequently, without introducing compensation terms in the form of additional renormalization, the Adler-Bell-Jackiw anomaly equation does not hold automatically in the bare form in this kind of schemes. We determine the corresponding (gauge-dependent) coefficient to $$ mathcal{O} $$ O ( $$ {alpha}_s^3 $$ αs3 ) in QCD, using a variant of the original Kreimer prescription which is implemented in our computation in terms of the standard cyclic trace together with a constructively-defined γ 5 . Owing to the factorized form of these divergences, intimately related to the axial anomaly, we further performed a check, using concrete examples, that with γ 5 treated in this way, the axial-current operator needs no more additional renormalization in dimensional regularization but only for non-anomalous amplitudes in a perturbatively renormalizable theory. To be complete, we provide a few additional ingredients needed for a proposed extension of the algorithmic procedure formulated in the above analysis to potential applications to a renormalizable anomaly-free chiral gauge theory, i.e. the electroweak theory.
通过计算空间正则化中真空和胶子对之间的单重态轴流算子的矩阵元，并定义了克莱默格式变体中的反交换γ 5，我们发现从QCD中的$$ mathcal{O} $$ O ($$ {alpha}_s^2 $$ α s 2)开始，需要额外的与chen - simons电流算子成比例的重整化逆项。这与众所周知的用非反交换γ 5定义的单重态轴流算子的纯乘法重整化相反。因此，在不引入额外重整化形式的补偿项的情况下，Adler-Bell-Jackiw异常方程在这种格式下不能自动保持裸形式。我们确定了QCD中对应的(测量相关的)系数$$ mathcal{O} $$ O ($$ {alpha}_s^3 $$ α s 3)，使用原始Kreimer处方的一种变体，该变体在我们的计算中根据标准循环迹线和构造定义的γ 5实现。由于这些散度的因式分解形式，与轴向异常密切相关，我们进一步用具体的例子进行了检查，用这种方式处理γ 5，轴流算子在维度正则化中不需要更多的额外重整化，而只需要在微扰重整化理论中对非异常振幅进行重整化。为了完成，我们提供了一些额外的成分，以建议将上述分析中制定的算法程序扩展到可重整的无异常手性规范理论(即电弱理论)的潜在应用。
{"title":"An observation on Feynman diagrams with axial anomalous subgraphs in dimensional regularization with an anticommuting γ5","authors":"Long Chen","doi":"10.1007/jhep11(2023)030","DOIUrl":"https://doi.org/10.1007/jhep11(2023)030","url":null,"abstract":"A bstract Through the calculation of the matrix element of the singlet axial-current operator between the vacuum and a pair of gluons in dimensional regularization with an anti-commuting γ 5 defined in a Kreimer-scheme variant, we find that additional renormalization counter-terms proportional to the Chern-Simons current operator are needed starting from $$ mathcal{O} $$ <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"> <mml:mi>O</mml:mi> </mml:math> ( $$ {alpha}_s^2 $$ <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"> <mml:msubsup> <mml:mi>α</mml:mi> <mml:mi>s</mml:mi> <mml:mn>2</mml:mn> </mml:msubsup> </mml:math> ) in QCD. This is in contrast to the well-known purely multiplicative renormalization of the singlet axial-current operator defined with a non-anticommuting γ 5 . Consequently, without introducing compensation terms in the form of additional renormalization, the Adler-Bell-Jackiw anomaly equation does not hold automatically in the bare form in this kind of schemes. We determine the corresponding (gauge-dependent) coefficient to $$ mathcal{O} $$ <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"> <mml:mi>O</mml:mi> </mml:math> ( $$ {alpha}_s^3 $$ <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"> <mml:msubsup> <mml:mi>α</mml:mi> <mml:mi>s</mml:mi> <mml:mn>3</mml:mn> </mml:msubsup> </mml:math> ) in QCD, using a variant of the original Kreimer prescription which is implemented in our computation in terms of the standard cyclic trace together with a constructively-defined γ 5 . Owing to the factorized form of these divergences, intimately related to the axial anomaly, we further performed a check, using concrete examples, that with γ 5 treated in this way, the axial-current operator needs no more additional renormalization in dimensional regularization but only for non-anomalous amplitudes in a perturbatively renormalizable theory. To be complete, we provide a few additional ingredients needed for a proposed extension of the algorithmic procedure formulated in the above analysis to potential applications to a renormalizable anomaly-free chiral gauge theory, i.e. the electroweak theory.","PeriodicalId":48906,"journal":{"name":"Journal of High Energy Physics","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135682374","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Stefan Dittmaier, Philipp Maierhöfer, Christopher Schwan, Ramon Winterhalder
A bstract We present a new calculation of next-to-leading-order corrections of the strong and electroweak interactions to like-sign W-boson scattering at the Large Hadron Collider, implemented in the Monte Carlo integrator B onsay . The calculation includes leptonic decays of the W bosons. It comprises the whole tower of next-to-leading-order contributions to the cross section, which scale like $$ {alpha}_{textrm{s}}^3 $$ αs3 α 4 , $$ {alpha}_{textrm{s}}^2 $$ αs2 α 5 , α s α 6 , and α 7 in the strong and electroweak couplings α s and α . We present a detailed survey of numerical results confirming the occurrence of large pure electroweak corrections of the order of ~ −12% for integrated cross sections and even larger corrections in high-energy tails of distributions. The electroweak corrections account for the major part of the complete next-to-leading-order correction, which amounts to 15–20% in size, depending on the details of the event selection chosen for analysing vector-boson-scattering. Moreover, we compare the full next-to-leading-order corrections to approximate results based on the neglect of contributions that are not enhanced by the vector-boson scattering kinematics (VBS approximation) and on resonance expansions for the W-boson decays (double-pole approximation) ; the quality of this approximation is good within ≲ 1 . 5% for integrated cross sections and the dominating parts of the differential distributions. Finally, for the leading-order predictions, we construct different versions of effective vector-boson approximations , which are based on cross-section contributions that are enhanced by collinear emission of W bosons off the initial-state (anti)quarks; in line with previous findings in the literature, it turns out that the approximative quality is rather limited for applications at the LHC.
摘要本文提出了在蒙特卡洛积分器B onsay中实现的大型强子对撞机强、电弱相互作用对w -玻色子散射的次一级修正的新计算。计算包括W玻色子的轻子衰变。在强耦合和电弱耦合α s和α中，它由整个次领先级贡献塔组成，其尺度为$$ {alpha}_{textrm{s}}^3 $$ α s 3 α 4, $$ {alpha}_{textrm{s}}^2 $$ α s 2 α 5， α s α 6和α 7。我们给出了详细的数值结果，证实了−12量级的大纯电弱修正的存在% for integrated cross sections and even larger corrections in high-energy tails of distributions. The electroweak corrections account for the major part of the complete next-to-leading-order correction, which amounts to 15–20% in size, depending on the details of the event selection chosen for analysing vector-boson-scattering. Moreover, we compare the full next-to-leading-order corrections to approximate results based on the neglect of contributions that are not enhanced by the vector-boson scattering kinematics (VBS approximation) and on resonance expansions for the W-boson decays (double-pole approximation) ; the quality of this approximation is good within ≲ 1 . 5% for integrated cross sections and the dominating parts of the differential distributions. Finally, for the leading-order predictions, we construct different versions of effective vector-boson approximations , which are based on cross-section contributions that are enhanced by collinear emission of W bosons off the initial-state (anti)quarks; in line with previous findings in the literature, it turns out that the approximative quality is rather limited for applications at the LHC.
{"title":"Like-sign W-boson scattering at the LHC — approximations and full next-to-leading-order predictions","authors":"Stefan Dittmaier, Philipp Maierhöfer, Christopher Schwan, Ramon Winterhalder","doi":"10.1007/jhep11(2023)022","DOIUrl":"https://doi.org/10.1007/jhep11(2023)022","url":null,"abstract":"A bstract We present a new calculation of next-to-leading-order corrections of the strong and electroweak interactions to like-sign W-boson scattering at the Large Hadron Collider, implemented in the Monte Carlo integrator B onsay . The calculation includes leptonic decays of the W bosons. It comprises the whole tower of next-to-leading-order contributions to the cross section, which scale like $$ {alpha}_{textrm{s}}^3 $$ <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"> <mml:msubsup> <mml:mi>α</mml:mi> <mml:mi>s</mml:mi> <mml:mn>3</mml:mn> </mml:msubsup> </mml:math> α 4 , $$ {alpha}_{textrm{s}}^2 $$ <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"> <mml:msubsup> <mml:mi>α</mml:mi> <mml:mi>s</mml:mi> <mml:mn>2</mml:mn> </mml:msubsup> </mml:math> α 5 , α s α 6 , and α 7 in the strong and electroweak couplings α s and α . We present a detailed survey of numerical results confirming the occurrence of large pure electroweak corrections of the order of ~ −12% for integrated cross sections and even larger corrections in high-energy tails of distributions. The electroweak corrections account for the major part of the complete next-to-leading-order correction, which amounts to 15–20% in size, depending on the details of the event selection chosen for analysing vector-boson-scattering. Moreover, we compare the full next-to-leading-order corrections to approximate results based on the neglect of contributions that are not enhanced by the vector-boson scattering kinematics (VBS approximation) and on resonance expansions for the W-boson decays (double-pole approximation) ; the quality of this approximation is good within ≲ 1 . 5% for integrated cross sections and the dominating parts of the differential distributions. Finally, for the leading-order predictions, we construct different versions of effective vector-boson approximations , which are based on cross-section contributions that are enhanced by collinear emission of W bosons off the initial-state (anti)quarks; in line with previous findings in the literature, it turns out that the approximative quality is rather limited for applications at the LHC.","PeriodicalId":48906,"journal":{"name":"Journal of High Energy Physics","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135679509","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A bstract Double holography offers a profound understanding of the island formula by describing a gravitational system on AdS d coupled to a conformal field theory on ℝ 1, d− 1 , dual to an AdS d +1 spacetime with an end-of-the-world (EOW) brane. In this work, we extend the proposal in [12] by considering that the dual bulk spacetime has two EOW branes: one with a gravitational system and the other with a thermal bath. We demonstrate an equivalence between this proposal and the wedge holographic theory. We examine it in both Anti-de Sitter gravity and de Sitter gravity by calculating the entanglement entropy of the Hawking radiation. Finally, we employ the doubly holographic model to verify the formula for the entanglement entropy in a subregion within conformally flat spacetime.
一个抽象的双全息通过描述一个在AdS d上的引力系统耦合到一个在d−1上的共形场论，对偶到一个具有世界末日(EOW)膜的AdS d +1时空，从而提供了对岛公式的深刻理解。在这项工作中，我们扩展了[12]中的建议，考虑到双体时空具有两个EOW膜:一个具有引力系统，另一个具有热浴。我们证明了这个提议和楔形全息理论之间的等价性。我们通过计算霍金辐射的纠缠熵来检验它在反德西特引力和德西特引力中的作用。最后，我们利用双全息模型验证了共形平坦时空中子区域的纠缠熵公式。
{"title":"Island formula in Planck brane","authors":"Jing-Cheng Chang, Song He, Yu-Xiao Liu, Long Zhao","doi":"10.1007/jhep11(2023)006","DOIUrl":"https://doi.org/10.1007/jhep11(2023)006","url":null,"abstract":"A bstract Double holography offers a profound understanding of the island formula by describing a gravitational system on AdS d coupled to a conformal field theory on ℝ 1, d− 1 , dual to an AdS d +1 spacetime with an end-of-the-world (EOW) brane. In this work, we extend the proposal in [12] by considering that the dual bulk spacetime has two EOW branes: one with a gravitational system and the other with a thermal bath. We demonstrate an equivalence between this proposal and the wedge holographic theory. We examine it in both Anti-de Sitter gravity and de Sitter gravity by calculating the entanglement entropy of the Hawking radiation. Finally, we employ the doubly holographic model to verify the formula for the entanglement entropy in a subregion within conformally flat spacetime.","PeriodicalId":48906,"journal":{"name":"Journal of High Energy Physics","volume":"151 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135973889","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A bstract We consider 4-dimensional $$ mathcal{N} $$ N = 2 superconformal quiver theories with SU( N ) M gauge group and bi-fundamental matter and we evaluate correlation functions of n coincident Wilson loops in the planar limit of the theory. Exploiting specific untwisted/twisted combinations of these operators and using supersymmetric localization, we are able to resum the whole perturbative expansion and find exact expressions for these correlators that are valid for all values of the ’t Hooft coupling. Moreover, we analytically derive the leading strong coupling behaviour of the correlators, showing that they obey a remarkable simple rule. Our analysis is complemented by numerical checks based on a Padé resummation of the perturbative series.
考虑具有SU(N) M规范群和双基物质的4维$$ mathcal{N} $$ N = 2超共形颤振理论，在该理论的平面极限下计算了N个重合Wilson环的相关函数。利用这些算子的特定的非扭曲/扭曲组合，并使用超对称局域化，我们能够恢复整个微扰展开，并找到对所有t - Hooft耦合值有效的这些相关器的精确表达式。此外，我们解析导出了相关器的主要强耦合行为，表明它们遵循一个非常简单的规则。我们的分析是由基于摄动级数的一种近似恢复的数值检验来补充的。
{"title":"Wilson loop correlators at strong coupling in $$ mathcal{N} $$ = 2 quiver gauge theories","authors":"Alessandro Pini, Paolo Vallarino","doi":"10.1007/jhep11(2023)003","DOIUrl":"https://doi.org/10.1007/jhep11(2023)003","url":null,"abstract":"A bstract We consider 4-dimensional $$ mathcal{N} $$ <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"> <mml:mi>N</mml:mi> </mml:math> = 2 superconformal quiver theories with SU( N ) M gauge group and bi-fundamental matter and we evaluate correlation functions of n coincident Wilson loops in the planar limit of the theory. Exploiting specific untwisted/twisted combinations of these operators and using supersymmetric localization, we are able to resum the whole perturbative expansion and find exact expressions for these correlators that are valid for all values of the ’t Hooft coupling. Moreover, we analytically derive the leading strong coupling behaviour of the correlators, showing that they obey a remarkable simple rule. Our analysis is complemented by numerical checks based on a Padé resummation of the perturbative series.","PeriodicalId":48906,"journal":{"name":"Journal of High Energy Physics","volume":"14 16","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135972759","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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