Inclusive $b + Z, Z → 𝜇^{+} 𝜇^{-}, e^{+} e^{-}$ production at CMS

Pramana

Natalie Heracleous1²  for the CMS Collaboration¹ 

[1] $$;I. Physikalisches Institut B, RWTH, Sommerfeldstr. 14, D-52074 Aachen, Germany$$

关键词: 𝑏-jet;    𝑍 boson;    Drell–Yan;    ratio;    CMS;    Large Hadron Collider;    heavy quarks.;   

DOI  :  

学科分类：物理（综合）

来源: Indian Academy of Sciences

【 摘 要 】

The production of 𝑍 bosons in association with at least one 𝑏-jet and 𝑍 decaying into muons or electrons is studied. This analysis is done by using proton–proton collisions delivered by the Large Hadron Collider (LHC) at a centre of mass energy of 7 TeV and with data recorded by the CMS detector in 2010, representing an integrated luminosity of 36 pb-1. A final state of two wellidentified muons or electrons and at least one 𝑏-tagged jet are required in order to perform this study. The event yields and shapes of kinematic variables are compared with Monte Carlo predictions from MADGRAPH. The ratio $𝜎 (Z + b)/𝜎 (Z + j)$ is found to be 0.054 ± 0.016 (0.046 ± 0.014) in the data for the 𝑍 → 𝑒𝑒 (𝑍 → 𝜇𝜇) selection, compared to 0.043 ± 0.005 (0.047 ± 0.005) estimated from NLO theory predictions.

【 授权许可】

Unknown