Collider constraints on electroweakinos in the presence of a light gravitino
Collider constraints on electroweakinos in the presence of a light gravitino
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DOI：
10.1140/epjc/s10052-023-11574-z
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发表时间：
2023-03
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通讯作者：
The Gambit Collaboration Viktor Ananyev;Csaba Bal'azs;A. Beniwal;Lasse Lorentz Braseth;Andy Buckley;J. Butterworth;Christopher Chang;M. Danninger;A. Fowlie;T. Gonzalo;A. Kvellestad;F. Mahmoudi;G. Martinez;M. Prim;Tomasz Procter;A. Raklev;P. Scott;Patrick Stöcker;J. V. D. Abeele;Martin White;Yang Zhang
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作者：
The Gambit Collaboration Viktor Ananyev;Csaba Bal'azs;A. Beniwal;Lasse Lorentz Braseth;Andy Buckley;J. Butterworth;Christopher Chang;M. Danninger;A. Fowlie;T. Gonzalo;A. Kvellestad;F. Mahmoudi;G. Martinez;M. Prim;Tomasz Procter;A. Raklev;P. Scott;Patrick Stöcker;J. V. D. Abeele;Martin White;Yang Zhang
使用GAMBIT全局拟合框架，我们用EV尺度的引力微子作为最轻的超对称粒子来约束MSSM，并将六个电性微子(中性微子和查尔吉诺微子)约束为仅有的其他轻新态。我们结合了13个TeV的15个ATLAS和12个CMS搜索，以及标准模型签名的ATLAS和CMS测量的大量集合。这个模型，我们称之为-EWMSSM，由于它有许多允许的电磁激诺产生过程和衰变模式，所以展示了相当不同的对撞机现象学。特征-EWMSSM信号事件有两个或更多标准模型玻色子，并由于逃逸的引力星而丢失能量。虽然-EWMSSM参数空间的大部分被排除在外，但我们发现了几个可行的参数区域，可以预测在Run 3或高光度LHC的运动学范围内有多个中性微子和查尔吉诺的现象丰富的场景。特别是，我们确定了Higgsino主导的电动weakinos的场景，其光线低至140 GeV，这与我们组合的对撞机搜索和测量结果是一致的。为这项工作生成的全套-EWMSSM参数样本和GAMBIT输入文件可以通过Zenodo获得。
Using the GAMBIT global fitting framework, we constrain the MSSM with an eV-scale gravitino as the lightest supersymmetric particle, and the six electroweakinos (neutralinos and charginos) as the only other light new states. We combine 15 ATLAS and 12 CMS searches at 13 TeV, along with a large collection of ATLAS and CMS measurements of Standard Model signatures. This model, which we refer to as the-EWMSSM, exhibits quite varied collider phenomenology due to its many permitted electroweakino production processes and decay modes. Characteristic-EWMSSM signal events have two or more Standard Model bosons and missing energy due to the escaping gravitinos. While much of the-EWMSSM parameter space is excluded, we find several viable parameter regions that predict phenomenologically rich scenarios with multiple neutralinos and charginos within the kinematic reach of the LHC during Run 3, or the High Luminosity LHC. In particular, we identify scenarios with Higgsino-dominated electroweakinos as light as 140 GeV that are consistent with our combined set of collider searches and measurements. The full set of-EWMSSM parameter samples and GAMBIT input files generated for this work is available via Zenodo.