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Recent anomalies in B physics

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Science Bulletin 2018年第5期63卷 267-269页

作者： Ying li cai-dian lü Department of Physics Yantai University Yantai 264005 China Institute of High Energy Physics Beijing 100049 China

It is widely believed that Standard model （SM） is not a final the-ory and should be an effective one of new theory at higher scale,because SM has a large number of parameters that have to be inputfrom experiment, it does not provide any candidate for dark mat-ter, dark energy and the resource of the matter-antimatter asym-metry of the universe。

关键词：中国科学通报英文版

The nonleptonic two body B decays involving a light tensor meson in final states

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Chinese Science Bulletin 2014年第29期59卷 3738-3747页

作者： Zhi-Tian Zou cai-dian l Department of Physics Yantai University Institute of High Energy Physics and Theoretical Physics Center for Science Facilities Chinese Academy of Sciences

The nonleptonic two body Bu;d;s;c decays involving a light tensor meson in final states are studied in the perturbative QCD approach based on *** decay modes with a tensor meson emitted,are prohibited in naive factorization,since the emission diagram with a tensor meson produced from vacuum is *** contributions from the so-called hard scattering emission diagrams and annihilation type diagrams are important and calculable in the perturbative QCD *** branching ratios of most decays are in the range of 10 4–10 8,which are bigger by 1 or 2 orders of magnitude than the predictions given by the naive factorization,but consistent with the predictions from the QCD factorization and the recent experimental *** also give the predictions for the direct CP asymmetries,some of which are large enough for the future experiments to *** also find that,even with a small mixing angle,the mixing between f2and f02can bring remarkable changes to both branching ratios and the direct CP asymmetries for some decays involving *** decays with a vector meson and a tensor meson in final states,we predict a large percentage of transverse polarization contributions due to the contributions of the orbital angular momentum of the tensor mesons.

关键词：矢量介子 B衰变张量终态车身微扰QCD 实验测量衰减模式

Extraction of the CKM phase γ from the charmless two-body B meson decays

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Chinese Physics C 2020年第6期44卷 12-19页

作者： Si-Hong Zhou cai-dian lü School of Physical Science and Technology Inner Mongolia UniversityHohhot 010021China Institute of High Energy Physics CASBeijing 100049China School of Physics University of Chinese Academy of SciencesBeijing 100049China

Using all experimentally measured charmless B → PP, PV decay modes, where P(V) denotes a light pseudoscalar(vector) meson, we extract the CKM angle γ by a global fit. All hadronic parameters are determined from the experimental data, such that the approach is least model dependent. The contributions of the various decay modes are classified by the topological weak Feynman diagram amplitudes, which are determined by the global *** improve the precision of the approach, we consider the flavor SU(3) breaking effects of the topological diagram amplitudes of the decay modes by including the form factors and decay constants. The fit result for the CKM angle γ is( 69.8 ± 2.1 ± 0.9)°. It is consistent with the current world average values but has a smaller uncertainty.

关键词： CKM phase charmless two-body B meson decays global fit

Sensitivity study of anomalous HZZ couplings at a future Higgs factory

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Chinese Physics C 2019年第10期43卷 1-6页

作者： Hua-Dong li cai-dian lü lian-You Shan Institute of High Energy Physics CASBeijing 100049China School of Physics University of Chinese Academy of SciencesBeijing 100049China

We study the sensitivity of constraining the model independent HZZ coupling based on the effective theory up to dimension-6 operators at a future Higgs factory. Using the current conceptual design parameters of the Circular Electron Positron Collider, we give the experimental limits for the model independent operators given by the total Higgsstrahlung cross-section and the angular distribution of Z boson decays. In particular, we give the very small sensitivity limit for the CP violation parameter g, which will be a clear window to test the Standard Model and look for new physics signals.

关键词： Higgs new physics effective field theory CEPC

New physics search in the doubly weak decay ■→K+π-*

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Chinese Physics C 2019年第7期43卷 8-21页

作者： Ying li cai-dian lü Yue-Hong Xie Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Department of Physics Yantai UniversityYantai 264005China University of Chinese Academy of Sciences Beijing 100049China Institute of Particle Physics Central China Normal UniversityWuhan 430079China Institute of Theoretical Physics College of Applied SciencesBeijing University of TechnologyBeijing 100124China

The doubly weak transition b-dd■ is highly suppressed in the Standard Model,which makes it a potential channel for exploring new physics *** present a study of the exclusive two-body wrong sign weak decay ■→K+π-,which belongs to this class,in the perturbative QCD *** perform a model independent analysis for various effective dimension-6 operators for which large effects are *** further analyze the considered process in the Randall-Sundrum model,including the custodially protected and the bulk-Higgs Randall-Sundrum *** the experimentally favored parameter space of these models leads to a large and significant enhancement of the decay rate compared to the Standard Model,which might be accessible in future *** propose to search for the wrong sign decay ■→K+π-via flavor-tagged time-dependent analyses,which can be performed at lHCb and Belle-Ⅱ.

关键词： wrong sign weak decay new physics PQCD

Charmless two-body B meson decays in the perturbative QCD factorization approach

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Chinese Physics C 2022年第12期46卷 68-105页

作者： Jian Chai Shan Cheng Yao-hui Ju Da-Cheng Yan cai-dian lü Zhen-Jun Xiao School of Physics and Electronics Hunan UniversityChangsha 410082China School for Theoretical Physics Hunan UniversityChangsha 410082China School of Mathematics and Physics Changzhou UniversityChangzhou 213164China Institute of High Energy Physics CASBeijing 100049China School of Physics University of Chinese Academy of SciencesBeijing 100049China Department of Physics and Institute of Theoretical Physics Nanjing Normal UniversityNanjing 210023China

The perturbative quantum chromodynamics(PQCD)approach based on k_(T)factorization has resulted in great achievements in the QCD calculation of hadronic B *** regulating the endpoint divergence by the transverse momentum of quarks in the propagators,one can perform the perturbation calculation for various diagrams,including annihilation type *** this paper,we review the current status of the PQCD factorization calculation of two-body charmless B→PP,PV,*** up to next-to-leading order(NlO)QCD *** new power suppressed terms in the decaying amplitudes are also *** universal input(non-perturbative)parameters,we collect the branching ratios and CP asymmetry parameters of all charmless two body B decays,which are calculated in the PQCD approach up to *** results are compared with those of the QCD factorization approach,soft-collinear effective theory approach,and current experimental *** most of the considered B meson decays,the PQCD results for branching ratios agree well with those of other approaches and experimental *** PQCD predictions for the CP asymmetry parameters of many of the decay channels do not agree with those of other approaches but have better agreement with experimental *** longstanding Kπpuzzle regarding the pattern of the direct CP asymmetries of penguin-dominated B→Kπdecays can be understood after the inclusion of NlO contributions in *** NlO corrections and power suppressed terms play an important role in color suppressed and pure annihilation type B decay *** rare decays are more sensitive to different types of corrections,providing an opportunity to examine the factorization approach with more precise experimental measurements.

关键词： B decays CP violation pQCD approach

Calculation of Pure Annihilation Type B Decay in PQCD Approach

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Calculation of Pure Annihilation Type B Decay in PQCD Approa...

第九届全国粒子物理学术会议

作者： Ying li,cai-dian lü Institute of High Energy Physics

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来源： cnki会议评论

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cnki会议

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重味物理:通通往新物理之门

科学通报 2018年第24期63卷 2536-2545页

作者：李营吕才典杨亚东烟台大学光电信息科学技术学院中国科学院高能物理研究所华中师范大学物理学院

作为高能物理的重要分支,重味物理在精确检验标准模型和寻找可能的新物理信号方面发挥着重要作用.近20年来,随着B介子工厂、北京正负电子对撞机和西欧大型强子对撞机的运行,重味物理的研究取得了重大进展.两个B介子工厂发现的B介子系统... 详细信息

作为高能物理的重要分支,重味物理在精确检验标准模型和寻找可能的新物理信号方面发挥着重要作用.近20年来,随着B介子工厂、北京正负电子对撞机和西欧大型强子对撞机的运行,重味物理的研究取得了重大进展.两个B介子工厂发现的B介子系统衰变中的电荷-宇称联合对称性(charge conjugation and parity,CP)破坏,将有助于进一步研究宇宙中正反物质不对称性.中性正反粒子的质量差有助于进一步判定新物理的能标;重味介子非轻衰变的研究使得对量子色动力学以及因子化的研究达到新的高度;更有趣的是,目前重味物理中出现的各种反常,如RK(*)和R(D(*)),可能是新物理存在的迹象.除此之外,重味物理还是研究新强子态的重要场所.近年来在北京谱仪(Beijing spectrometer,BES-III)、B介子工厂以及lHC底夸克侦测器(large hadron collider beauty,lHCb)上发现的众多奇特强子态为研究夸克模型和量子色动力学提供了新的动力.2018年,高精度对撞机Belle-II将开机运行,国际直线对撞机、环形正负电子对撞机、超级Z工厂也在积极推进,它们在重味物理上都具有各自的优势.未来这些高精度、高能量对撞机会使重味物理进入新的黄金时期.

关键词：重味物理标准模型新物理电荷-宇称联合对称性(CP)破坏反常新强子态

Λb→Λl+l- in perturbative QCD

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Λb→Λl+l- in perturbative QCD