arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 0910.0423hep-ex
收藏

BaBar上Upplane(1 S)衰变的轻子普适性检验

Lepton Universality Test in Upsilon(1S) decays at BaBar

Elisa Guido

摘要:

利用SLAC国家加速器实验室的PEP-Ⅱ非对称能量对撞机上BaBar探测器收集的1.22亿个3S衰变样品,我们测量了R_taumu=BR的比值(上升(1 S)->tau^+tau^-)/BR(上升(1 S)->mu^+mu^-);测量的目的是检验轻子的普适性,并作为在最小超对称标准下寻找轻赝标量希格斯玻色子的可能性模型(NMSSM)场景。这样的玻色子可能出现在R_taumu与标准模型期望值的偏差中,即1,除了小的轻子质量修正。该分析利用了衰变Uppersons(3S)-> Uppersons(1 S)pi^+pi^-,Uppersons(1 S)-> l^+l^-,其中l = mu,tau。

英文摘要:

Using a sample of 122 million Upsilon(3S) decays collected with the BaBar detector at the PEP-II asymmetric energy collider at the SLAC National Accelerator Laboratory, we measure the ratio R_taumu=BR(Upsilon(1S)->tau^+tau^-)/BR(Upsilon(1S)->mu^+mu^-); the measurement is intended as a test of lepton universality and as a possible search for a light pseudoscalar Higgs boson in Next to Minimal Supersymmetric Standard Model (NMSSM) scenarios. Such a boson could appear in a deviation of the ratio R_taumu from the Standard Model expectation, that is 1, except for small lepton mass corrections. The analysis exploits the decays Upsilon(3S) -> Upsilon(1S) pi^+pi^-, Upsilon(1S) -> l^+l^-, where l = mu, tau.

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。

↑