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Flavor Violation at LHC in Events with Two Opposite Sign Leptons and a B-Jet 具有两个相反符号轻子和一个b型喷气机的大型强子对撞机事件的风味冲突
Pub Date : 2020-11-25 DOI: 10.1007/978-981-33-4408-2_34
N. Kumar
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引用次数: 1
Flavor structure of anomaly-free hidden photon models 无异常隐藏光子模型的风味结构
Pub Date : 2020-11-25 DOI: 10.1103/PHYSREVD.103.075024
M. Bauer, P. Foldenauer, Martin Mosny
Extensions of the Standard Model with an abelian gauge group are constrained by gauge anomaly cancellation, so that only a limited number of possible charge assignments is allowed without the introduction of new chiral fermions. For flavour universal charges, couplings of the associated hidden photon to Standard Model fermions are flavour conserving at tree-level. We show explicitly that even the flavour specific charge assignments allowed by anomaly cancellation condition lead to flavour conserving tree-level couplings of the hidden photon to quarks and charged leptons emph{if} the CKM or PMNS matrix can be successfully reconstructed. Further, loop-induced flavour changing couplings are strongly suppressed. As a consequence, the structure of the Majorana mass matrix is constrained and flavour changing tree-level couplings of the hidden photon to neutrino mass eigenstates are identified as a means to distinguish the $U(1)_{B-L}$ gauge boson from any other anomaly-free extension of the Standard Model without new chiral fermions. We present a comprehensive analysis of constraints and projections for future searches for a $U(1)_{B-3L_i}$ gauge boson, calculate the reach of resonance searches in $B$ meson decays and comment on the implications for non-standard neutrino interactions.
带阿贝尔规范群的标准模型扩展受到规范异常抵消的约束,因此在不引入新的手性费米子的情况下,只允许有限数量的可能电荷赋值。对于风味通用电荷,相关的隐藏光子与标准模型费米子的耦合在树水平上保持风味。我们明确地表明,emph{如果}CKM或PMNS矩阵能够成功重建,即使异常抵消条件允许的风味特定电荷分配也会导致隐藏光子与夸克和带电轻子的风味保持树级耦合。此外,回路诱导的风味变化耦合被强烈抑制。因此,马约拉纳质量矩阵的结构受到约束,隐藏光子与中微子质量特征态的变化树级耦合被确定为区分$U(1)_{B-L}$规范玻色子与任何其他没有新手性费米子的标准模型的无异常扩展的一种手段。我们全面分析了未来搜索$U(1)_{B-3L_i}$规范玻色子的限制和预测,计算了$B$介子衰变中共振搜索的范围,并评论了对非标准中微子相互作用的影响。
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引用次数: 14
Inclusive diffractive heavy quarkonium photoproduction including quark subprocesses 包括夸克子过程的包涵衍射重夸克子光生产
Pub Date : 2020-11-25 DOI: 10.1103/PhysRevC.104.015204
Jiayu Wu, Yanbing Cai, W. Xiang
The inclusive $J/Psi$, $Psi(2S)$ and $Upsilon(1S)$ direct and resolved photoproduction are investigated by including the quark subprocesses in the framework of non-relativistic quantum chromodynamics (NRQCD). We find that the theoretical total cross section of heavy quarkonium productions are in good agreement with the data available at HERA, once the $gamma q$, $qg$ and $qq$ subprocesses in the heavy quark pair productions are taken into account. The inclusive diffractive rapidity and transverse momentum distributions of $J/Psi$, $Psi(2S)$ and $Upsilon(1S)$ in $pp$, $pPb$ and $PbPb$ collisions at LHC are also studied by our quark improved NRQCD model combined with the resolved pomeron model. We find that the contributions from the quark involved subprocesses can reach to $8%$ in the rapidity distribution and $6%$ in the transverse momentum distribution. The numerical results show that the contributions from quark involved subprocesses are significant in heavy quarkonium photoprodution.
通过将夸克子过程纳入非相对论量子色动力学(NRQCD)的框架,研究了包括$J/Psi$、$Psi(2S)$和$Upsilon(1S)$在内的直接和分辨光产生。我们发现,一旦考虑到重夸克对产生中的$gamma q$、$qg$和$qq$子过程,重夸克产生的理论总截面与HERA的数据吻合得很好。利用夸克改进的NRQCD模型结合分辨玻密子模型,研究了大型强子对撞$pp$、$pPb$和$PbPb$中$J/Psi$、$Psi(2S)$和$Upsilon(1S)$的包涵衍射速度和横向动量分布。我们发现参与子过程的夸克的贡献在速度分布中可以达到$8%$,在横向动量分布中可以达到$6%$。数值结果表明,参与子过程的夸克对重夸克光产生的贡献是显著的。
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引用次数: 0
Low energy phenomena of the lepton sector in an $A_4$ symmetry model with heavy inverse seesaw neutrinos 具有重反跷跷板中微子的$A_4$对称模型中轻子扇区的低能现象
Pub Date : 2020-11-24 DOI: 10.1093/ptep/ptac002
T. P. Nguyen, T. T. Thuc, D. T. Si, T.T.Hong, L. T. Hue
An extension of the two Higgs doublet model including inverse seesaw neutrinos and neutral Higgs bosons was constructed based on the $A_4$ symmetry in order to explain the recent neutrino oscillation data. This model can distinguish two well-known normal and inverted order schemes of neutrino data once both the effective masses $m_{beta}$ in tritium beta decays and $langle mrangle$ in the neutrinoless double beta decay are observed. The lepton flavor violating decays of the charged leptons $e_brightarrow e_agamma$, $murightarrow3e$, the Standard model-like Higgs boson decays $hrightarrow e_be_a$, and the $mu$-e conversions in some nuclei arise from loop corrections. The experimental data of the branching ratio Br$(murightarrow egamma, 3e)$ predicts that the upper bounds of Br$(tau rightarrow mugamma,egamma)$ and Br$(hrightarrow e_{a}e_b)$ are much smaller than the planned experimental sensitivities. In contrast, the $mu$-e conversions are the promising signals for experiments.
为了解释最近的中微子振荡数据,在$A_4$对称性的基础上建立了包含反跷跷板中微子和中性希格斯玻色子的双希格斯双重态模型的扩展。一旦同时观测到氚β衰变的有效质量$m_{beta}$和无中微子双β衰变的有效质量$langle mrangle$,该模型就可以区分出两种众所周知的中微子数据的正序格式和倒序格式。违反带电轻子衰减$e_brightarrow e_agamma$、$murightarrow3e$的轻子,类似标准模型的希格斯玻色子衰减$hrightarrow e_be_a$,以及某些原子核中的$mu$ -e转换是由环修正引起的。分支比Br $(murightarrow egamma, 3e)$的实验数据预测Br $(tau rightarrow mugamma,egamma)$和Br $(hrightarrow e_{a}e_b)$的上界远小于计划的实验灵敏度。相比之下,$mu$ -e转换是有希望用于实验的信号。
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引用次数: 6
Decoding the nature of Zcs(3985) and establishing the spectrum of charged heavy quarkoniumlike states in chiral effective field theory 破译Zcs(3985)的性质,建立手性有效场论中带电重夸克类态谱
Pub Date : 2020-11-22 DOI: 10.1103/PHYSREVD.103.L021501
Bo Wang, L. Meng, Shi-Lin Zhu
We study the newly observed charmoniumlike state $Z_{cs}(3985)$ in the framework of chiral effective field theory. The interaction kernel of the $bar{D}_sD^ast/bar{D}^ast_sD$ system is calculated up to the next-to-leading order with the explicit chiral dynamics. With the fitted parameters extracted from the $Z_c(3900)$ data as inputs, the mass, width and event distributions of the $Z_{cs}(3985)$ are very consistent with the experimental measurements. Our studies strongly support the $Z_{cs}(3985)$ as the partner of the $Z_c(3900)$ in the SU(3)$_f$ symmetry and the $bar{D}_sD^ast/bar{D}^ast_sD$ molecular resonance with the same dynamical origin as the other charged heavy quarkoniumlike states. We precisely predict the resonance parameters of the unobserved states in $bar{D}_s^ast D^ast$, $B^ast_s bar{B}/B_sbar{B}^ast$ and $B_s^astbar{B}^ast$ systems, and establish a complete spectrum of the charged charmoniumlike and bottomoniumlike states with the $I(J^P)$ quantum numbers $1(1^+)$ and $frac{1}{2}(1^+)$, respectively.
我们在手性有效场论的框架下研究了新观察到的类调和态$Z_{cs}(3985)$。通过显式手性动力学计算$bar{D}_sD^ast/bar{D}^ast_sD$系统的相互作用核直至次一级。以$Z_c(3900)$数据提取的拟合参数作为输入,$Z_{cs}(3985)$的质量、宽度和事件分布与实验测量结果非常吻合。我们的研究有力地支持了$Z_{cs}(3985)$作为SU(3) $_f$对称中$Z_c(3900)$的伙伴,以及$bar{D}_sD^ast/bar{D}^ast_sD$分子共振与其他带电重夸克类态具有相同的动力学起源。我们精确地预测了$bar{D}_s^ast D^ast$、$B^ast_s bar{B}/B_sbar{B}^ast$和$B_s^astbar{B}^ast$体系中未观测态的共振参数,并分别以$I(J^P)$量子数$1(1^+)$和$frac{1}{2}(1^+)$建立了带电类调和态和类底铌态的完整谱。
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引用次数: 8
Resummation effects in weak SUSY processes 弱SUSY过程的恢复效应
Pub Date : 2020-11-21 DOI: 10.22323/1.390.0239
J. Fiaschi, M. Klasen
We present updated results for the production cross sections of slepton pairs and neutralino-chargino pairs at the LHC with next-to-next-to logarithmic precision matched at approximate QCD next-to-next-to leading order. The explored range of masses of the supersymmetric particles are chosen to be relevant for current and future searches at the LHC. We find moderate increases in the invariant mass distributions and integrated cross sections, and substantial reductions in the scale uncertainty of the results.
我们提出了在LHC上的睡眠子对和中性子-电荷对的生产截面的更新结果,其精度与近似QCD的次-次-次阶相匹配。所探索的超对称粒子的质量范围被选择为与LHC当前和未来的搜索相关。我们发现恒定质量分布和综合截面的适度增加,结果的尺度不确定性大幅降低。
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引用次数: 0
Testing momentum dependence of the nonperturbative hadron structure in a global QCD analysis 在全局QCD分析中检验非微扰强子结构的动量依赖性
Pub Date : 2020-11-19 DOI: 10.1103/PHYSREVD.103.054029
A. Courtoy, P. Nadolsky
We discuss strategies for comparisons of nonperturbative QCD predictions for parton distribution functions (PDFs) with high-energy experiments in the region of large partonic momentum fractions $x$. Analytic functional forms for PDFs cannot be uniquely determined solely based on discrete experimental measurements because of a mathematical property of mimicry of PDF parametrizations that we prove using a representation based on B'ezier curves. Predictions of nonperturbative QCD approaches for the $x$ dependence of PDFs instead should be cast in a form that enables decisive comparisons against experimental measurements. Predictions for effective power laws of $(1-x)$ dependence of PDFs may play this role. Expectations for PDFs in a proton based on quark counting rules are compared against the effective power laws of $(1-x)$ dependence satisfied by CT18 next-to-next-to-leading order parton distributions. We comment on implications for studies of PDFs in a pion, in particular on the comparison of nonperturbative approaches with phenomenological PDFs.
我们讨论了在大部分子动量分数区域内,对部分子分布函数(pdf)的非微扰QCD预测与高能实验的比较策略。PDF的解析泛函形式不能仅仅基于离散的实验测量来唯一地确定,因为PDF参数化的模拟的数学性质,我们使用基于B ezier曲线的表示来证明。对于pdf的x依赖性的非微扰QCD方法的预测应该以一种能够与实验测量进行决定性比较的形式进行。对pdf文件$(1-x)$依赖性的有效幂律的预测可以发挥这一作用。基于夸克计数规则的质子pdf期望值与CT18次至次至领先阶部分子分布所满足的$(1-x)$依赖的有效幂律进行了比较。我们评论了介子中pdf研究的意义,特别是非微扰方法与现象学pdf的比较。
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引用次数: 18
Reaching the Planck scale with muon lifetime measurements 通过测量介子寿命达到普朗克尺度
Pub Date : 2020-11-19 DOI: 10.1103/PhysRevD.103.106025
I. Lobo, C. Pfeifer
Planck scale modified dispersion relations are one way how to capture the influence of quantum gravity on the propagation of fundamental point particles effectively. We derive the time dilation between an observer's or particle's proper time, given by a Finslerian length measure induced from a modified dispersion relation, and a reference laboratory time. To do so, the Finsler length measure for general first order perturbations of the general relativistic dispersion relation is constructed explicitly. From this we then derive the time dilation formula for the $kappa$-Poincar'e dispersion relation in several momentum space bases, as well as for modified dispersion relations considered in the context of loop quantum gravity and Hov{r}ava-Lifshitz gravity. Most interestingly we find that the momentum Lorentz factor in the present and future colliders can, in principle, become large enough to constrain the $kappa$-Poincar'e dispersion relation in the bicrossproduct basis with Planck scale sensitivity with help of the muon's lifetime.
修正普朗克尺度色散关系是有效捕捉量子引力对基本点粒子传播影响的一种方法。我们推导了由修正色散关系导出的芬斯勒长度测量给出的观察者或粒子固有时与参考实验室时间之间的时间膨胀。为此,明确地构造了广义相对论色散关系一般一阶扰动的Finsler长度测度。在此基础上,我们推导出了几个动量空间基中$kappa$-Poincar'e色散关系的时间膨胀公式,以及在环量子引力和Hov{r} va- lifshitz引力的背景下考虑的修正色散关系的时间膨胀公式。最有趣的是,我们发现,在现在和未来的对撞机中,动量洛伦兹因子原则上可以变得足够大,从而在普朗克尺度灵敏度的基础上,在μ子寿命的帮助下,约束双叉积基础上的$kappa$-Poincar'e色散关系。
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引用次数: 21
Theoretical and experimental status of rare charm decays 稀有粲衰变的理论与实验现状
Pub Date : 2020-11-18 DOI: 10.1142/S0217732321300020
H. Gisbert, Marcel Golz, D. Mitzel
Rare charm decays offer the unique possibility to explore flavour-changing neutral-currents in the up-sector within the Standard Model and beyond. Due to the lack of effective methods to reliably describe its low energy dynamics, rare charm decays have been considered as less promising for long. However, this lack does not exclude the possibility to perform promising searches for New Physics per se, but a different philosophy of work is required. Exact or approximate symmetries of the Standard Model allow to construct clean null-test observables, yielding an excellent road to the discovery of New Physics, complementing the existing studies in the down-sector. In this review, we summarise the theoretical and experimental status of rare charm $|Delta c|=|Delta u|=1$ transitions, as well as opportunities for current and future experiments such as LHCb, Belle II, BES III and the FCC-ee. We also use the most recent experimental results to report updated limits on lepton-flavour conserving and lepton-flavour violating Wilson coefficients.
罕见的魅力衰变提供了独特的可能性,可以探索在标准模型内外的上层部门中改变口味的中性电流。由于缺乏有效的方法来可靠地描述其低能动力学,稀有粲衰变一直被认为是不太有前途的。然而,这种缺乏并不排除为新物理学本身进行有前途的搜索的可能性,但需要一种不同的工作哲学。标准模型的精确或近似对称性允许构建干净的零检验观测,为发现新物理学提供了一条绝佳的道路,补充了现有的下部门研究。在这篇综述中,我们总结了稀有魅力$|Delta c|=|Delta u|=1$跃迁的理论和实验现状,以及LHCb、Belle II、BES III和FCC-ee等当前和未来实验的机会。我们还使用最新的实验结果报告了轻子-风味保存和轻子-风味违反威尔逊系数的最新限制。
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引用次数: 10
Study the $$B^{0}_{(s)}$$ decays into $$phi $$ and a scalar or vector meson 研究$$B^{0}_{(s)}$$衰变为$$phi $$和一个标量或矢量介子
Pub Date : 2020-11-17 DOI: 10.1140/epjc/s10052-021-09497-8
Hiwa A. Ahmed, Zhong-Yu Wang, Zhi-Feng Sun, C. Xiao
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引用次数: 8
期刊
arXiv: High Energy Physics - Phenomenology
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