Dortmund 2021 – scientific programme
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T: Fachverband Teilchenphysik
T 86: Search for New Particles IV
T 86.7: Talk
Thursday, March 18, 2021, 17:30–17:45, Tk
Sensitivity of the SHiP experiment to dark photons decaying to a pair of charged particles — •Atakan Tuğberk Akmete1, Anne-Marie Magnan2, and Ali Murat Güler3 — 1Johannes Gutenberg Universität, Mainz, Germany — 2Imperial College London, United Kingdom — 3Middle East Technical University, Ankara, Turkey
SHiP is a planned fixed-target experiment that aims to search directly or indirectly for electrically neutral, feebly interacting, hidden particles with masses below O(10) GeV. It plans to collect 2 × 1020 protons on target with a 400 GeV SPS proton beam in 5 years of running. The hidden particles should have renormalizable interactions with SM fields through small dimensionless coupling operators, so-called portals. According to their spin, each portal refers to a different mediator. One of the most critical portals is the vector portal since all three fundamental forces interact through vector bosons. The kinetic mixing model of the vector portal has a mediator that mixes with the U(1) photon by a coupling ε. This mediator is known as dark photon and has a mass of mγD. It is the lightest particle of the hidden sector; therefore, it could decay into fermion pairs. In this talk, recent research on the SHiP experiment’s sensitivity to dark photons decaying to a pair of charged particles is presented. Our exclusion contours claim a unique sensitivity for mγD ranging between 0.8 and 3.3−0.5+0.2 GeV, and ε2 ranging between 10−11 and 10−17.