TY - JOUR AU - Alidra, M. et al AU - Torro Pastor, E. PY - 2021 DA - 2021// TI - The MATHUSLA test stand T2 - Nucl. Instrum. Methods Phys. Res. A JO - Nuclear Instruments & Methods in Physics Research A SP - 164661 EP - 9pp VL - 985 PB - Elsevier KW - Long-lived particles KW - LHC KW - MATHUSLA KW - Backscattered cosmic rays AB - The rate of muons from LHC pp collisions reaching the surface above the ATLAS interaction point is measured as a function of the ATLAS luminosity and compared with expected rates from decays of W and Z bosons and b- and c-quark jets. In addition, data collected during periods without beams circulating in the LHC provide a measurement of the background from cosmic ray inelastic backscattering that is compared to simulation predictions. Data were recorded during 2018 in a 2.5 x 2.5 x 6.5 m(3) active volume MATHUSLA test stand detector unit consisting of two scintillator planes, one at the top and one at the bottom, which defined the trigger, and six layers of RPCs between them, grouped into three (x, y)-measuring layers separated by 1.74 m from each other. Triggers selecting both upward-going tracks and downward-going tracks were used. SN - 0168-9002 UR - https://arxiv.org/abs/2005.02018 UR - https://doi.org/10.1016/j.nima.2020.164661 DO - 10.1016/j.nima.2020.164661 LA - English N1 - WOS:000592358200022 ID - Alidra+TorroPastor2021 ER -