arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0903.2487hep-ph
收藏

约束MSSM中的BR(b->s gamma)和(g-2)_μ子是否一致?

Are BR(b->s gamma) and (g-2)_muon consistent within the Constrained MSSM?

F. Feroz, M. P. Hobson, L. Roszkowski, R. Ruiz de Austri, R. Trotta

摘要:

我们采用两种不同的统计检验来检验在约束MSSM的框架下,实验测定的BR(b->s γ)值和μ子的反常磁矩(g-2)值是否相互一致。我们的测试旨在比较数据空间中CMSSM的理论预测与实际测量,一旦所有的CMSSM自由参数已被整合出来,并使用所有其他可用的数据进行约束。我们研究了通过单独使用e+e-数据获得的(g-2)值(与SM预测存在约3 σ差异)和基于τ衰变数据获得的(g-2)值(显示出更温和的1 σ差异)。我们发现,我们的测试之一返回统计上不确定的结果,或者显示BR(b->s gamma)和基于e+e-数据的值(g-2)之间的张力的弱证据。另一方面,我们的第二个测试,这是更严格的应用程序,揭示了BR(b->s伽马)和(g-2)的联合观察单独从e+e-数据是不兼容的CMSSM在~ 2西格玛水平。另一方面,对于这两个测试,我们发现BR(b->s γ)和使用τ衰变数据评估的(g-2)值之间没有显著的张力。这些结果仅弱依赖于我们在分析中采用的三种不同的先验。我们的结论是,如果(g-2)的标准模型和实验测定之间的差异在3西格玛水平得到证实,这可以被解释为对CMSSM的强有力的证据。

英文摘要:

We employ two different statistical tests to examine whether, in the framework of the Constrained MSSM, the experimentally determined values of BR(b->s gamma) and the anomalous magnetic moment of the muon, (g-2), are consistent with each other. Our tests are designed to compare the theoretical predictions of the CMSSM in data space with the actual measurements, once all of the CMSSM free parameters have been integrated out and constrained using all other available data. We investigate the value of (g-2) as obtained by using e+e- data alone (which shows a ~3sigma discrepancy with the SM prediction) and as obtained based on tau decay data (which shows a much milder, 1sigma discrepancy). We find that one of our tests returns either a statistically inconclusive result or shows weak evidence of tension between BR(b->s gamma) and the e+e- data based value of (g-2). On the other hand, our second test, which is more stringent in this application, reveals that the joint observations of BR(b->s gamma) and (g-2) from e+e- data alone are incompatible within the CMSSM at the ~2sigma level. On the other hand, for both tests we find no significant tension between BR(b->s gamma) and the value of (g-2) evaluated using tau decay data. These results are only weakly dependent on the three different priors that we employ in the analysis. We conclude that, if the discrepancy between the Standard Model and the experimental determinations of (g-2) is confirmed at the 3sigma level, this could be interpreted as strong evidence against the CMSSM.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑