A bstract In this note we describe how to complement the neutrino evolution matrix calculated at a given energy and trajectory with additional information which allows to reliably extrapolate it to nearby energies or trajectories without repeating the full computation. Our method works for arbitrary matter density profiles, can be applied to any propagation model described by an Hamiltonian, and exactly guarantees the unitarity of the evolution matrix. As a straightforward application, we show how to enhance the calculation of the theoretical predictions for experimentally measured quantities, so that they remain accurate even in the presence of fast neutrino oscillations. Furthermore, the ability to “move around” a given energy and trajectory opens the door to precise interpolation of the oscillation amplitudes within a grid of tabulated values, with potential benefits for the computation speed of Monte-Carlo codes. We also provide a set of examples to illustrate the most prominent features of our approach.
{"title":"From ray to spray: augmenting amplitudes and taming fast oscillations in fully numerical neutrino codes","authors":"Michele Maltoni","doi":"10.1007/jhep11(2023)033","DOIUrl":"https://doi.org/10.1007/jhep11(2023)033","url":null,"abstract":"A bstract In this note we describe how to complement the neutrino evolution matrix calculated at a given energy and trajectory with additional information which allows to reliably extrapolate it to nearby energies or trajectories without repeating the full computation. Our method works for arbitrary matter density profiles, can be applied to any propagation model described by an Hamiltonian, and exactly guarantees the unitarity of the evolution matrix. As a straightforward application, we show how to enhance the calculation of the theoretical predictions for experimentally measured quantities, so that they remain accurate even in the presence of fast neutrino oscillations. Furthermore, the ability to “move around” a given energy and trajectory opens the door to precise interpolation of the oscillation amplitudes within a grid of tabulated values, with potential benefits for the computation speed of Monte-Carlo codes. We also provide a set of examples to illustrate the most prominent features of our approach.","PeriodicalId":48906,"journal":{"name":"Journal of High Energy Physics","volume":"63 9","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135540135","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 construct theories of free fermions in (2 n − 1)-dimensions with SU(1 , n ) spacetime symmetry from the null reduction of fermions on a 2 n -dimensional Ω-deformed Minkowski background for n = 2 and n = 3. These play a role in the 5d SU(1 , 3)-invariant theories that are conjectured to offer a full description of certain 6d superconformal field theories. We find the (2 n − 1)-dimensional manifestation of the supersymmetry of a free 2 n -dimensional boson-fermion system, which we use to fix the fermion two-point functions. It is then shown that the full 2 n -dimensional two-point function can be recovered through resummation. Limits of the theories are considered, and it is observed that both Galilean and Carrollian field theories appear in different regimes. We confirm that the correlation functions obey the SU(1 , n ) Ward identities and the representations of the fermions under this group are discussed.
{"title":"Fermions with SU(1, n) spacetime symmetry","authors":"Joseph Smith","doi":"10.1007/jhep11(2023)032","DOIUrl":"https://doi.org/10.1007/jhep11(2023)032","url":null,"abstract":"A bstract We construct theories of free fermions in (2 n − 1)-dimensions with SU(1 , n ) spacetime symmetry from the null reduction of fermions on a 2 n -dimensional Ω-deformed Minkowski background for n = 2 and n = 3. These play a role in the 5d SU(1 , 3)-invariant theories that are conjectured to offer a full description of certain 6d superconformal field theories. We find the (2 n − 1)-dimensional manifestation of the supersymmetry of a free 2 n -dimensional boson-fermion system, which we use to fix the fermion two-point functions. It is then shown that the full 2 n -dimensional two-point function can be recovered through resummation. Limits of the theories are considered, and it is observed that both Galilean and Carrollian field theories appear in different regimes. We confirm that the correlation functions obey the SU(1 , n ) Ward identities and the representations of the fermions under this group are discussed.","PeriodicalId":48906,"journal":{"name":"Journal of High Energy Physics","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135539501","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 portal connecting the invisible and visible sectors is one of the most natural explanations of the dark world. However, the early-time dark matter production via the portal faces extremely stringent late-time constraints. To solve such tension, we construct the scalar-controlled kinetic mixing varying with the ultralight CP-even scalar’s cosmological evolution. To realize this and eliminate the constant mixing, we couple the ultralight scalar within 10 − 33 eV ≲ m 0 ≪ eV with the heavy doubly charged messengers and impose the ℤ 2 symmetry under the dark charge conjugation. Via the varying mixing, the keV – MeV dark photon dark matter is produced through the early-time freeze-in when the scalar is misaligned from the origin and free from the late-time exclusions when the scalar does the damped oscillation and dynamically sets the kinetic mixing. We also find that the scalar-photon coupling emerges from the underlying physics, which changes the cosmological history and provides the experimental targets based on the fine-structure constant variation and the equivalence principle violation. To ensure the scalar naturalness, we discretely re-establish the broken shift symmetry by embedding the minimal model into the ℤ N -protected model. When N ~ 10, the scalar’s mass quantum correction can be suppressed much below 10 − 33 eV.
{"title":"Cosmologically varying kinetic mixing","authors":"Xucheng Gan, Di Liu","doi":"10.1007/jhep11(2023)031","DOIUrl":"https://doi.org/10.1007/jhep11(2023)031","url":null,"abstract":"A bstract The portal connecting the invisible and visible sectors is one of the most natural explanations of the dark world. However, the early-time dark matter production via the portal faces extremely stringent late-time constraints. To solve such tension, we construct the scalar-controlled kinetic mixing varying with the ultralight CP-even scalar’s cosmological evolution. To realize this and eliminate the constant mixing, we couple the ultralight scalar within 10 − 33 eV ≲ m 0 ≪ eV with the heavy doubly charged messengers and impose the ℤ 2 symmetry under the dark charge conjugation. Via the varying mixing, the keV – MeV dark photon dark matter is produced through the early-time freeze-in when the scalar is misaligned from the origin and free from the late-time exclusions when the scalar does the damped oscillation and dynamically sets the kinetic mixing. We also find that the scalar-photon coupling emerges from the underlying physics, which changes the cosmological history and provides the experimental targets based on the fine-structure constant variation and the equivalence principle violation. To ensure the scalar naturalness, we discretely re-establish the broken shift symmetry by embedding the minimal model into the ℤ N -protected model. When N ~ 10, the scalar’s mass quantum correction can be suppressed much below 10 − 33 eV.","PeriodicalId":48906,"journal":{"name":"Journal of High Energy Physics","volume":"73 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135539545","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}
Federico Capone, Prahar Mitra, Aaron Poole, Bilyana Tomova
A bstract We perform a complete and systematic analysis of the solution space of six-dimensional Einstein gravity. We show that a particular subclass of solutions — those that are analytic near $$ mathcal{I} $$ I + — admit a non-trivial action of the generalised Bondi-Metzner-van der Burg-Sachs (GBMS) group which contains infinite-dimensional supertranslations and superrotations. The latter consists of all smooth volume-preserving Diff×Weyl transformations of the celestial S 4 . Using the covariant phase space formalism and a new technique which we develop in this paper (phase space renormalization), we are able to renormalize the symplectic potential using counterterms which are local and covariant . The Hamiltonian charges corresponding to GBMS diffeomorphisms are non-integrable. We show that the integrable part of these charges faithfully represent the GBMS algebra and in doing so, settle a long-standing open question regarding the existence of infinite-dimensional asymptotic symmetries in higher even dimensional non-linear gravity. Finally, we show that the semi-classical Ward identities for supertranslations and superrotations are precisely the leading and subleading soft-graviton theorems respectively.
我们对六维爱因斯坦引力的解空间进行了完整而系统的分析。我们证明了在$$ mathcal{I} $$ I +附近解析解的一个特殊子类承认包含无限维超平移和超旋转的广义Bondi-Metzner-van der Burg-Sachs (GBMS)群的非平凡作用。后者由天体s4的所有光滑的体积保持Diff×Weyl变换组成。利用协变相空间形式和本文提出的一种新技术(相空间重整化)，我们可以用局部协变的反项对辛势进行重整化。对应于GBMS微分同胚的哈密顿电荷是不可积的。我们证明了这些电荷的可积部分忠实地表示了GBMS代数，从而解决了一个长期存在的关于高偶数维非线性重力中无限维渐近对称性的存在性的开放性问题。最后，我们证明了超平移和超旋转的半经典Ward恒等式分别是软引力子的先导定理和次先导定理。
{"title":"Phase space renormalization and finite BMS charges in six dimensions","authors":"Federico Capone, Prahar Mitra, Aaron Poole, Bilyana Tomova","doi":"10.1007/jhep11(2023)034","DOIUrl":"https://doi.org/10.1007/jhep11(2023)034","url":null,"abstract":"A bstract We perform a complete and systematic analysis of the solution space of six-dimensional Einstein gravity. We show that a particular subclass of solutions — those that are analytic near $$ mathcal{I} $$ <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"> <mml:mi>I</mml:mi> </mml:math> + — admit a non-trivial action of the generalised Bondi-Metzner-van der Burg-Sachs (GBMS) group which contains infinite-dimensional supertranslations and superrotations. The latter consists of all smooth volume-preserving Diff×Weyl transformations of the celestial S 4 . Using the covariant phase space formalism and a new technique which we develop in this paper (phase space renormalization), we are able to renormalize the symplectic potential using counterterms which are local and covariant . The Hamiltonian charges corresponding to GBMS diffeomorphisms are non-integrable. We show that the integrable part of these charges faithfully represent the GBMS algebra and in doing so, settle a long-standing open question regarding the existence of infinite-dimensional asymptotic symmetries in higher even dimensional non-linear gravity. Finally, we show that the semi-classical Ward identities for supertranslations and superrotations are precisely the leading and subleading soft-graviton theorems respectively.","PeriodicalId":48906,"journal":{"name":"Journal of High Energy Physics","volume":"79 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135539978","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}
Giorgos Anastasiou, Ignacio J. Araya, Cristóbal Corral, Rodrigo Olea
Abstract We present a streamlined proof that any Einstein-AdS space is a solution of the Lu, Pang and Pope conformal gravity theory in six dimensions. The reduction of conformal gravity into Einstein theory manifestly shows that the action of the latter can be written as the Einstein-Hilbert term plus the Euler topological density and an additional contribution that depends on the Laplacian of the bulk Weyl tensor squared. The prescription for obtaining this form of the action by embedding the Einstein theory into a Weyl-invariant purely metric theory, was dubbed Conformal Renormalization and its resulting action was shown to be equivalent to the one obtained by holographic renormalization. As a non-trivial application of the method, we compute the Noether-Wald charges and thermodynamic quantities for topological black hole solutions with generic transverse section in Einstein-AdS 6 theory.
{"title":"Conformal Renormalization of topological black holes in AdS6","authors":"Giorgos Anastasiou, Ignacio J. Araya, Cristóbal Corral, Rodrigo Olea","doi":"10.1007/jhep11(2023)036","DOIUrl":"https://doi.org/10.1007/jhep11(2023)036","url":null,"abstract":"Abstract We present a streamlined proof that any Einstein-AdS space is a solution of the Lu, Pang and Pope conformal gravity theory in six dimensions. The reduction of conformal gravity into Einstein theory manifestly shows that the action of the latter can be written as the Einstein-Hilbert term plus the Euler topological density and an additional contribution that depends on the Laplacian of the bulk Weyl tensor squared. The prescription for obtaining this form of the action by embedding the Einstein theory into a Weyl-invariant purely metric theory, was dubbed Conformal Renormalization and its resulting action was shown to be equivalent to the one obtained by holographic renormalization. As a non-trivial application of the method, we compute the Noether-Wald charges and thermodynamic quantities for topological black hole solutions with generic transverse section in Einstein-AdS 6 theory.","PeriodicalId":48906,"journal":{"name":"Journal of High Energy Physics","volume":"27 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135540053","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 Error-correcting codes are known to define chiral 2d lattice CFTs where all the U(1) symmetries are enhanced to SU(2). In this paper, we extend this construction to a broader class of length- n codes which define full (non-chiral) CFTs with SU(2) n symmetry, where n = c + $$ overline{c} $$ c¯ . We show that codes give a natural discrete ensemble of 2d theories in which one can compute averaged observables. The partition functions obtained from averaging over all codes weighted equally is found to be given by the sum over modular images of the vacuum character of the full extended symmetry group, and in this case the number of modular images is finite. This averaged partition function has a large gap, scaling linearly with n , in primaries of the full SU(2) n symmetry group. Using the sum over modular images, we conjecture the form of the genus-2 partition function. This exhibits the connected contributions to disconnected boundaries characteristic of wormhole solutions in a bulk dual.
{"title":"Averaging over codes and an SU(2) modular bootstrap","authors":"Johan Henriksson, Brian McPeak","doi":"10.1007/jhep11(2023)035","DOIUrl":"https://doi.org/10.1007/jhep11(2023)035","url":null,"abstract":"A bstract Error-correcting codes are known to define chiral 2d lattice CFTs where all the U(1) symmetries are enhanced to SU(2). In this paper, we extend this construction to a broader class of length- n codes which define full (non-chiral) CFTs with SU(2) n symmetry, where n = c + $$ overline{c} $$ <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"> <mml:mover> <mml:mi>c</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> . We show that codes give a natural discrete ensemble of 2d theories in which one can compute averaged observables. The partition functions obtained from averaging over all codes weighted equally is found to be given by the sum over modular images of the vacuum character of the full extended symmetry group, and in this case the number of modular images is finite. This averaged partition function has a large gap, scaling linearly with n , in primaries of the full SU(2) n symmetry group. Using the sum over modular images, we conjecture the form of the genus-2 partition function. This exhibits the connected contributions to disconnected boundaries characteristic of wormhole solutions in a bulk dual.","PeriodicalId":48906,"journal":{"name":"Journal of High Energy Physics","volume":"76 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135539333","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 Consider a system consisting of D p and D p ′, placed parallel at a separation and with p − p ′ = 2 n (assuming p ≥ p ′, the integer n ≥ 0 and p ′ > 0). When either D p or D p ′ carries a worldvolume electric flux, one in general expects a non-vanishing open string pair production due to the pair of virtual open string/anti open string connecting the two D branes under the action of the applied flux. However, this will not be true for p ′ = 0 and p = 2 , 4 , 6 when the D p carries a pure electric flux. In this note, we will explore the case for which a finite non-vanishing open string pair production rate can indeed be produced when a certain worldvolume flux is applied to the Dp brane and understand the physics behind.
考虑一个由pdp和pdp '组成的系统，它们平行放置在一个间隔处，p - p ' = 2n(假设p≥p '，整数n≥0,p ' >当D p或D p '携带世界体积电通量时，由于在外加通量的作用下连接两个D膜的虚开弦/反开弦对，人们通常期望产生不消失的开弦对。然而，当p ' = 0和p = 2,4,6时，当p带纯电通量时，这就不成立了。在这篇文章中，我们将探讨当将一定的世界体积通量应用于Dp膜时，是否确实可以产生有限的非消失开弦对产生率，并了解其背后的物理原理。
{"title":"Understanding the open string pair production of the Dp/D0 system","authors":"J. X. Lu","doi":"10.1007/jhep11(2023)019","DOIUrl":"https://doi.org/10.1007/jhep11(2023)019","url":null,"abstract":"A bstract Consider a system consisting of D p and D p ′, placed parallel at a separation and with p − p ′ = 2 n (assuming p ≥ p ′, the integer n ≥ 0 and p ′ > 0). When either D p or D p ′ carries a worldvolume electric flux, one in general expects a non-vanishing open string pair production due to the pair of virtual open string/anti open string connecting the two D branes under the action of the applied flux. However, this will not be true for p ′ = 0 and p = 2 , 4 , 6 when the D p carries a pure electric flux. In this note, we will explore the case for which a finite non-vanishing open string pair production rate can indeed be produced when a certain worldvolume flux is applied to the Dp brane and understand the physics behind.","PeriodicalId":48906,"journal":{"name":"Journal of High Energy Physics","volume":"6 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135679825","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 study the stability of the electroweak vacuum in the supersymmetric (SUSY) standard model (SM), paying particular attention to its relation to the SUSY contribution to the muon anomalous magnetic moment a μ . If the SUSY contribution to a μ is sizable, the electroweak vacuum may become unstable because of enhanced trilinear scalar interactions. With a μ being fixed, larger slepton masses require more enhanced trilinear couplings, which make the electroweak vacuum more unstable. Thus, assuming SUSY contribution to a μ being sizable, an upper bound on the slepton masses is obtained. We give a detailed prescription to perform a full one-loop calculation of the decay rate of the electroweak vacuum for the case that the SUSY contribution to a μ is enhanced. We also give an upper bound on the slepton masses as a function of the SUSY contribution to a μ .
{"title":"Stability of electroweak vacuum and supersymmetric contribution to muon g − 2","authors":"So Chigusa, Takeo Moroi, Yutaro Shoji","doi":"10.1007/jhep11(2023)027","DOIUrl":"https://doi.org/10.1007/jhep11(2023)027","url":null,"abstract":"A bstract We study the stability of the electroweak vacuum in the supersymmetric (SUSY) standard model (SM), paying particular attention to its relation to the SUSY contribution to the muon anomalous magnetic moment a μ . If the SUSY contribution to a μ is sizable, the electroweak vacuum may become unstable because of enhanced trilinear scalar interactions. With a μ being fixed, larger slepton masses require more enhanced trilinear couplings, which make the electroweak vacuum more unstable. Thus, assuming SUSY contribution to a μ being sizable, an upper bound on the slepton masses is obtained. We give a detailed prescription to perform a full one-loop calculation of the decay rate of the electroweak vacuum for the case that the SUSY contribution to a μ is enhanced. We also give an upper bound on the slepton masses as a function of the SUSY contribution to a μ .","PeriodicalId":48906,"journal":{"name":"Journal of High Energy Physics","volume":"40 17","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135680486","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 present a unified framework for the perturbative factorization connecting Euclidean correlations to light-cone correlations. Starting from nonlocal quark and gluon bilinear correlators, we derive the relevant hard-matching kernel up to the next-to-leading-order, both for the flavor singlet and non-singlet combinations, in non-forward and forward kinematics, and in coordinate and momentum space. The results for the generalized distribution functions (GPDs), parton distribution functions (PDFs), and distribution amplitudes (DAs) are obtained by choosing appropriate kinematics. The renormalization and matching are done in a state-of-the-art scheme. We also clarify some issues raised on the perturbative matching of GPDs in the literature. Our results provide a complete manual for extracting all leading-twist GPDs, PDFs as well as DAs from lattice simulations of Euclidean correlations in a state-of-the-art strategy, either in coordinate or in momentum space factorization approach.
{"title":"Connecting Euclidean to light-cone correlations: from flavor nonsinglet in forward kinematics to flavor singlet in non-forward kinematics","authors":"Fei Yao, Yao Ji, Jian-Hui Zhang","doi":"10.1007/jhep11(2023)021","DOIUrl":"https://doi.org/10.1007/jhep11(2023)021","url":null,"abstract":"A bstract We present a unified framework for the perturbative factorization connecting Euclidean correlations to light-cone correlations. Starting from nonlocal quark and gluon bilinear correlators, we derive the relevant hard-matching kernel up to the next-to-leading-order, both for the flavor singlet and non-singlet combinations, in non-forward and forward kinematics, and in coordinate and momentum space. The results for the generalized distribution functions (GPDs), parton distribution functions (PDFs), and distribution amplitudes (DAs) are obtained by choosing appropriate kinematics. The renormalization and matching are done in a state-of-the-art scheme. We also clarify some issues raised on the perturbative matching of GPDs in the literature. Our results provide a complete manual for extracting all leading-twist GPDs, PDFs as well as DAs from lattice simulations of Euclidean correlations in a state-of-the-art strategy, either in coordinate or in momentum space factorization approach.","PeriodicalId":48906,"journal":{"name":"Journal of High Energy Physics","volume":"61 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":"135684540","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 A → Z (*) h decay signature has been highlighted as possibly being the first testable probe of the Standard Model (SM) Higgs boson discovered in 2012 ( h ) interacting with Higgs companion states, such as those existing in a 2-Higgs Doublet Model (2HDM), chiefly, a CP-odd one ( A ). The production mechanism of the latter at the Large Hadron Collider (LHC) takes place via $$ boverline{b} $$ bb¯ -annihilation and/or gg -fusion, depending on the 2HDM parameters, in turn dictated by the Yukawa structure of this Beyond the SM (BSM) scenario. Among the possible incarnations of the 2HDM, we test here the so-called Type-II, for a twofold reason. On the one hand, it intriguingly offers two very distinct parameter regions compliant with the SM-like Higgs measurements, i.e., where the so-called ‘SM limit’ of the 2HDM can be achieved. On the other hand, in both configurations, the AZh coupling is generally small, hence the signal is strongly polluted by backgrounds, so that the exploitation of Machine Learning (ML) techniques becomes extremely useful. In this paper, we show that the application of advanced ML implementations can be decisive in establishing such a signal. This is true for all distinctive kinematical configurations involving the A → Z (*) h decay, i.e., below threshold ( m A < m Z + m h ), at its maximum ( m Z + m h < m A < 2 m t ) and near the onset of $$ toverline{t} $$ tt¯ pair production ( m A ≈ 2 m t ), for which we propose Benchmark Points (BPs) for future phenomenological analyses.
A→Z (*) h衰变特征被强调为可能是2012年发现的标准模型(SM)希格斯玻色子(h)与希格斯伴生态相互作用的第一个可测试探测，例如存在于2-希格斯双重态模型(2HDM)中的那些，主要是一个cp奇数(A)。后者在大型强子对撞机(LHC)上的产生机制是通过$$ boverline{b} $$ b¯湮灭和/或gg -聚变发生的，这取决于2HDM参数，而这又取决于这个超越SM (BSM)场景的汤川结构。在可能的2HDM版本中，我们在这里测试所谓的Type-II，有两个原因。一方面，有趣的是，它提供了两个非常不同的参数区域，符合类标准希格斯测量，即，所谓的2HDM的“标准SM极限”可以实现。另一方面，在这两种配置中，AZh耦合通常很小，因此信号受到背景的强烈污染，因此机器学习(ML)技术的利用变得非常有用。在本文中，我们证明了高级机器学习实现的应用对于建立这样的信号是决定性的。这对于涉及A→Z (*) h衰减的所有不同的运动学构型都是正确的，即低于阈值(m A ＆lt;m Z + m h)，在其最大值(m Z + m h ＆lt;m ＆;2 m t)和接近$$ toverline{t} $$ t t¯对生产(m A≈2 m t)的开始(m A≈2 m t)，我们提出了用于未来现象学分析的基准点(bp)。
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