Search for rare decays of Z and Higgs bosons to J/ψ and a photon in proton-proton collisions at [Formula: see text] = 13 TeV

在质子-质子碰撞中,寻找 Z 玻色子和希格斯玻色子衰变为 J/ψ 粒子和光子的罕见衰变,碰撞能量为 [公式:见正文] = 13 TeV。

阅读:1

Abstract

A search is presented for decays of Z and Higgs bosons to a J/ψ meson and a photon, with the subsequent decay of the J/ψ to μ+μ- . The analysis uses data from proton-proton collisions with an integrated luminosity of 35.9 fb-1 at [Formula: see text] collected with the CMS detector at the LHC. The observed limit on the Z → J/ψγ decay branching fraction, assuming that the J/ψ meson is produced unpolarized, is 1.4 × 10-6 at 95% confidence level, which corresponds to a rate higher than expected in the standard model by a factor of 15. For extreme-polarization scenarios, the observed limit changes from - 13.6 to + 8.6% with respect to the unpolarized scenario. The observed upper limit on the branching fraction for H → J/ψγ where the J/ψ meson is assumed to be transversely polarized is 7.6 × 10-4 , a factor of 260 larger than the standard model prediction. The results for the Higgs boson are combined with previous data from proton-proton collisions at [Formula: see text] to produce an observed upper limit on the branching fraction for H → J/ψγ that is a factor of 220 larger than the standard model value.

特别声明

1、本页面内容包含部分的内容是基于公开信息的合理引用;引用内容仅为补充信息,不代表本站立场。

2、若认为本页面引用内容涉及侵权,请及时与本站联系,我们将第一时间处理。

3、其他媒体/个人如需使用本页面原创内容,需注明“来源:[生知库]”并获得授权;使用引用内容的,需自行联系原作者获得许可。

4、投稿及合作请联系:info@biocloudy.com。