Data-driven estimation of neutral pileup particle multiplicity in high-luminosity hadron collider environments

21st International Conference on Computing in High Energy and Nuclear Physics

物理学;计算机科学

Colecchia, Federico^1

Brunel University London, Kingston Lane, Uxbridge

UB8 3PH, United Kingdom^1

关键词: Hadron colliders;    High energy scattering;    Individual particles;    Large Hadron Collider;    Number density;    Operation regime;    Particle multiplicity;    Weighting techniques;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/664/7/072013/pdf
DOI  :  10.1088/1742-6596/664/7/072013

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

The upcoming operation regimes of the Large Hadron Collider are going to place stronger requirements on the rejection of particles originating from pileup, i.e. from interactions between other protons. For this reason, particle weighting techniques have recently been proposed in order to subtract pileup at the level of individual particles. We describe a choice of weights that, unlike others that rely on particle proximity, exploits the particle-level kinematic signatures of the high-energy scattering and of the pileup interactions. We illustrate the use of the weights to estimate the number density' of neutral pileup particles inside individual events, and we elaborate on the complementarity' between ours and other methods. We conclude by suggesting the idea of combining different sets of weights with a view to exploiting different features of the underlying processes for improved pileup subtraction at higher luminosity'.