用ATLAS探测器寻找希格斯玻色子衰变成eτ和μτ in√(s) = 13 TeV pp碰撞的轻子味违反

IF 1.3 4区工程技术 Q3 INSTRUMENTS & INSTRUMENTATION

Journal of Instrumentation Pub Date : 2023-10-01 DOI:10.1088/1748-0221/18/10/c10001

Antonio Jesús Gómez Delegido

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引用次数: 0

摘要

摘要利用Run-2数据，利用ATLAS探测器在大型强子对撞机上直接搜索希格斯玻色子到eτ和μτ最终态的违反轻子风味的衰变。包括轻子和强子衰变τ -轻子，并采用了两种不同的背景估计技术:基于数据校正模拟样本的mc -模板方法和基于利用标准模型背景中电子和介子之间对称性的数据驱动方法。在95%置信水平下，分支比的观测(预期)上限分别为:△△(H→eτ)<△0.20%(0.12%)和△△(H→μτ)<△0.18%(0.09%)，在τ -轻子衰变为轻子的通道中，最合适的分支比差为△0.25±0.10，且在2.5 σ范围内的值为零。

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Searches for lepton-flavour violating decays of the Higgs boson into eτ and μτ in √(s) = 13 TeV pp collisions with the ATLAS detector

Abstract Direct searches for lepton-flavour-violating decays of the Higgs boson into eτ and μτ final states with the ATLAS detector at the LHC with Run-2 data are presented. Both leptonically and hadronically decaying τ -leptons are included and two different background estimation techniques are employed: a MC-template method, based on data-corrected simulation samples, and a data-driven method, based on exploiting the symmetry between electrons and muons in the Standard Model backgrounds. Observed (Expected) upper limits are set on the branching ratios at 95 % confidence level, ℬ ( H → eτ )<0.20 % (0.12 %) and ℬ ( H → μτ )<0.18% (0.09 %), and a best-fit branching ratio difference, ℬ ( H → μτ ) - ℬ ( H → eτ ), of 0.25 ± 0.10 % is found in the channel where the τ -lepton decays to leptons, compatible with a value of zero within 2.5 σ .

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来源期刊

Journal of Instrumentation 工程技术-仪器仪表

CiteScore

2.40

自引率

15.40%

发文量

827

审稿时长

7.5 months

期刊介绍： Journal of Instrumentation (JINST) covers major areas related to concepts and instrumentation in detector physics, accelerator science and associated experimental methods and techniques, theory, modelling and simulations. The main subject areas include. -Accelerators: concepts, modelling, simulations and sources- Instrumentation and hardware for accelerators: particles, synchrotron radiation, neutrons- Detector physics: concepts, processes, methods, modelling and simulations- Detectors, apparatus and methods for particle, astroparticle, nuclear, atomic, and molecular physics- Instrumentation and methods for plasma research- Methods and apparatus for astronomy and astrophysics- Detectors, methods and apparatus for biomedical applications, life sciences and material research- Instrumentation and techniques for medical imaging, diagnostics and therapy- Instrumentation and techniques for dosimetry, monitoring and radiation damage- Detectors, instrumentation and methods for non-destructive tests (NDT)- Detector readout concepts, electronics and data acquisition methods- Algorithms, software and data reduction methods- Materials and associated technologies, etc.- Engineering and technical issues. JINST also includes a section dedicated to technical reports and instrumentation theses.