代非普适Z'模型下中性Bs介子混合的研究

鲁公儒; 李新强; 李艳敏; 苏方

doi:10.7498/aps.61.241301

摘要

基于LHCb、Tevatron以及D0实验组关于中性Bs介子混合的最新实验结果, 12s中有可能存在大的新物理贡献, 我们在代非普适Z'模型下对Bs-Bs混合进行了研究. 假定Z'玻色子不仅对非对角矩阵元M12s有贡献, 还考虑了由树图交换Z'玻色子所导致的b scc算符对非对角矩阵元12s的贡献. 结果表明: 在Ms, s和Bd J/ KS衰变的间接CP不对称这些物理可观测量的联合限制下, 实验值afss不到解释. 因此, 在对代非普适Z'模型假定下, 不能同时对所有中性Bs介子混合观测量给出解释. 伴随着LHCb以及未来的超级B工厂的运行,尤其是对CP不对称afss的测量, 期望这一问题将得到解答.

关键词:

Abstract

Motivated by recent measurements of the neutral Bs-meson mixing, obtained by LHCb group and the Tevatron, and the possibility to have sizable NP effects in 12s, we revisit the Bs mixing in a family non-universal Z' model. We assume that the Z' boson contributes to the off-diagonal element M12s and also to the off-diagonal element 12s via tree-level Z'-induced b scc operators. We find that, with the constraints from Mss and the indirect CP asymmetry in BdJ/KS imposed, the present measured 1 experimental ranges for afss could not be reproduced. Thus, such a specific model could not simultaneously explain the present data on Bs mixing. It is expected that with the operation of the LHCb group and the future super B experiments, more accurate measurements, especially of the flavour-specific CP asymmetries, could shed light on the issue.

Keywords:

作者及机构信息

1.
河南师范大学物理与信息工程学院, 新乡 453007;

2.
华中师范大学粒子物理研究所, 武汉 430079

基金项目: 高等学校博士学科点专项科研基金(批准号: 20104104120001)和国家自然科学基金(批准号: 11005032, 11047125, 10979008)资助的课题.

Authors and contacts

1.
Department of Physics, Henan Normal University, Xinxiang 453007, China;

2.
Institute of Particle Physics, Huazhong Normal University, Wuhan 430079, China

Funds: Project supported by the Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20104104120001), and the National Natural Science Foundation of China (Grant Nos. 11005032, 11047125, 10979008).

参考文献

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[31]	Beneke M, Buchalla G, Lenz A, Nierste U 2003 Phys. Lett. B 576 173
[32]	Ciuchini M, Franco E, Lubicz V, Mescia F, Tarantino C 2003 JHEP 0308 031
[33]	Lenz A, Nierste U 2007 JHEP 0706 072
[34]	Chiang C W, Datta A, Duraisamy M, London D, Nagashima M, Szynkman A 2010 JHEP 1004 031
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[38]	Dorsner I, Drobnak J, Fajfer S, Kamenik J F, Kosnik N 2011 JHEP 1111 002
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施引文献

[1]	Ball P, Fleischer R 2006 Eur. Phys. J. C 48 413
[2]	Asner D 2010 arXiv:1010. 1589
[3]	Abazov V M 2006 Phys. Rev. Lett. 97 021802
[4]	Abulencia A 2006 Phys. Rev. Lett. 97 062003; Abulencia A Phys. Rev. Lett. 97 242003
[5]	Aaij R 2012 Phys. Lett. B 709 177
[6]	The 2011 LHCb-CONF-2011-050 .
[7]	Lenz A J 2011 Phys. Rev. D 84 031501
[8]	Lenz A, Nierste U 2011 arXiv:1102.4274 [hep-ph]
[9]	Lenz A, Nierste U Charles J, Descotes-Genon S, Jantsch A, Kaufhold C, Lacker H, Monteil S, Niess V, T'Jampens S 2011 Phys. Rev. D 83 036004
[10]	Aaltonen T 2011 arXiv:1112.1726
[11]	Abazov V M 2012 Phys. Rev. D 85 032006
[12]	Aaltonen T 2008 Phys. Rev. Lett. 100 161802;Aaltoner T 2008 Phys. Rev. Lett. 100 121803
[13]	Abazov V M 2008 Phys. Rev. Lett. 101 241801
[14]	Aaij R 2012 Phys. Rev. Lett. 108 101803
[15]	Aaij R 2012 Phys. Lett. B 707 497
[16]	Grossman Y, Nir Y, Raz G 2006 Phys. Rev. Lett. 97 151801
[17]	Abazov V M 2010 Phys. Rev. D 82 032001; 2010 Phys. Rev. Lett. 105 081801
[18]	Abazov V M 2011 Phys. Rev. D 84 052007
[19]	Langacker P, Plumacher M 2000 Phys. Rev. D 62 013006
[20]	Barger V, Everett L, Jiang J, Langacker P, Liu T, Wagner C 2009 Phys. Rev. D 80 055008;Barger V, Everett L L, Jiang J, Langacker P, Liu T, Wagner C E M 2009 JHEP 0912 048
[21]	Alok A K, Baek S, London D 2011 JHEP 1107 111
[22]	Buras A J, Gemmler K,Isidori G 2011 Nucl. Phys. B 843 107
[23]	Gorbahn M, Jager S, Nierste U, Trine S 2011 Phys. Rev. D 84 034030
[24]	Buras A J, Jager S, Urban J 2001 Nucl. Phys. B 605 600
[25]	Buras A J 1998 hep-ph/9806471;Buchalla G, Buras A J, Lautenbacher M E 1996 Rev. Mod. Phys. 68 1125
[26]	Shifman M A, Voloshin M B 1985 Sov. J. Nucl. Phys. 41 120 Shifman M A, Voloshin M B 1986 Sov. Phys. JETP 64 698
[27]	Bigi I I Y, Uraltsev N G, Vainshtein A I 1992 Phys. Lett. B 293 430;Bigi I I Y, Uraltsec N G, Vainshtein A I 1993 Erratum-ibid. B 297 477
[28]	Beneke M, Buchalla G, Dunietz I 1996 Phys. Rev. D 54 4419 Benekem, Buchalla G, Duniez I 2011 Erratum-Ibid. D 83 119902
[29]	Dighe A S, Hurth T, Kim C S, Yoshikawa T 2002 Nucl. Phys. B 624 377
[30]	Beneke M, Buchalla G, Greub C, Lenz A, Nierste U 1999 Phys. Lett. B 459 631
[31]	Beneke M, Buchalla G, Lenz A, Nierste U 2003 Phys. Lett. B 576 173
[32]	Ciuchini M, Franco E, Lubicz V, Mescia F, Tarantino C 2003 JHEP 0308 031
[33]	Lenz A, Nierste U 2007 JHEP 0706 072
[34]	Chiang C W, Datta A, Duraisamy M, London D, Nagashima M, Szynkman A 2010 JHEP 1004 031
[35]	Nakamura K 2010 J. Phys. G 37 075021
[36]	Lancaster M arXiv:1107.5255 [hep-ex]
[37]	Wolfenstein L 1983 Phys. Rev. Lett. 51 1945
[38]	Dorsner I, Drobnak J, Fajfer S, Kamenik J F, Kosnik N 2011 JHEP 1111 002
[39]	Colangelo G, Durr S, Juttner A, Lellouch L, Leutwyler H, Lubicz V, Necco S, Sachrajda C T , Simula S ,Vladikas A ,Wenger U, Wittig H 2011 Eur. Phys. J. C 71 1695
[40]	Chetyrkin K G, Kuhn J H, Steinhauser M 2000 Comput. Phys. Commun. 133 43
[41]	Charles J 2005 Eur. Phys. J. C 411
[42]	Acosta D 2005 Phys. Rev. Lett. 95 131801

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