Searching for gluino LSP at the LHC

IF 4.2 2区物理与天体物理 Q2 PHYSICS, PARTICLES & FIELDS

The European Physical Journal C Pub Date : 2025-05-17 DOI:10.1140/epjc/s10052-025-14199-6

Paulina Knees, Essodjolo Kpatcha, Iñaki Lara, Daniel E. López-Fogliani, Carlos Muñoz, Natsumi Nagata, Hidetoshi Otono

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Abstract

We analyse relevant signals expected at the LHC, assuming that the gluino is the lightest supersymmetric particle (LSP) in the framework of the \(\mu \nu \)SSM. In this R-parity violating model, the presence of couplings involving right-handed neutrinos solves simultaneously the \(\mu \) problem and the accommodations of neutrino masses and mixing angles. We study gluino pair production in quark-antiquark and gluon-gluon collisions. The main decay channels for the gluino LSP are the three-body decays to two quarks and a lepton or a neutrino. In both cases, the leading channels occur for the third family of quarks. We compare the predictions of this scenario with LHC searches for prompt and long-lived particles. To analyse the parameter space we sample the \(\mu \nu \)SSM for a gluino LSP, paying special attention to reproduce the current experimental data on neutrino and Higgs physics, as well as flavour observables. Our results imply a lower limit on the mass of the gluino LSP of about 2600 GeV, and an upper limit for the decay length of about 6 cm.

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在大型强子对撞机上搜索胶子LSP

假设胶子是\(\mu \nu \) SSM框架中最轻的超对称粒子（LSP），我们分析了LHC预期的相关信号。在这个违反r宇称的模型中，涉及右手中微子的耦合的存在同时解决了\(\mu \)问题和中微子质量和混合角的调节。我们研究了夸克-反夸克和胶子-胶子碰撞中胶子对的产生。胶子LSP的主要衰变通道是三体衰变成两个夸克和一个轻子或一个中微子。在这两种情况下，领先的通道出现在第三族夸克中。我们将这种情况的预测与大型强子对撞机寻找快速和长寿命粒子的预测进行了比较。为了分析参数空间，我们对胶子LSP的\(\mu \nu \) SSM进行了采样，特别注意再现了中微子和希格斯物理的当前实验数据，以及其他可观测到的数据。我们的结果表明胶子LSP的质量下限约为2600 GeV，衰减长度的上限约为6 cm。

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来源期刊

The European Physical Journal C 物理-物理：粒子与场物理

CiteScore

8.10

自引率

15.90%

发文量

1008

审稿时长

2-4 weeks

期刊介绍： Experimental Physics I: Accelerator Based High-Energy Physics Hadron and lepton collider physics Lepton-nucleon scattering High-energy nuclear reactions Standard model precision tests Search for new physics beyond the standard model Heavy flavour physics Neutrino properties Particle detector developments Computational methods and analysis tools Experimental Physics II: Astroparticle Physics Dark matter searches High-energy cosmic rays Double beta decay Long baseline neutrino experiments Neutrino astronomy Axions and other weakly interacting light particles Gravitational waves and observational cosmology Particle detector developments Computational methods and analysis tools Theoretical Physics I: Phenomenology of the Standard Model and Beyond Electroweak interactions Quantum chromo dynamics Heavy quark physics and quark flavour mixing Neutrino physics Phenomenology of astro- and cosmoparticle physics Meson spectroscopy and non-perturbative QCD Low-energy effective field theories Lattice field theory High temperature QCD and heavy ion physics Phenomenology of supersymmetric extensions of the SM Phenomenology of non-supersymmetric extensions of the SM Model building and alternative models of electroweak symmetry breaking Flavour physics beyond the SM Computational algorithms and tools...etc.