Real-time b-jet identification in ATLAS

20th International Conference on Computing in High Energy and Nuclear Physics

物理学;计算机科学

Buzatu, A.^1

Research Associate, University of Glasgow, Glasgow

G12 8QQ, United Kingdom^1

关键词: ATLAS detectors;    Bottom quarks;    Charged leptons;    Higgs boson;    Pair production;    Real-time identification;    Transverse energy;    Vector boson;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/513/1/012004/pdf
DOI  :  10.1088/1742-6596/513/1/012004

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

There are interesting physics processes studied at the ATLAS detector at the LHC, whose signatures contain quark jets, but no charged lepton: top quark pair production where both quarks decay hadronically, Higgs boson produced in vector boson fusion and decaying to a bottom quark pair, or supersymmetric signatures with no charged lepton. Data for these processes can only be collected using jet-based triggers. As LHC instantaneous luminosity increases, jet transverse-energy thresholds need to be raised, lowering the signal acceptance for a wide range of signatures. However, the need to raise jet thresholds can be made less pressing if jets originating from bottom quarks are identified as such (b-tagging) already at the trigger stage if at least one jet originates from a bottom quark. ATLAS started using b-jet real-time identification in 2011, increased their performance in 2012 and plans to use even more advanced taggers in 2015.