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Updated: Jan 17, 2026

Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
Observation of the Charged-Particle Multiplicity Dependence of σ_{ψ(2S)}/σ_{J/ψ} in p-Pb Collisions at 8.16 TeV
V Chekhovsky1, A Hayrapetyan1, V Makarenko1
1Yerevan Physics Institute, Yerevan, Armenia.
Abstract:
Bound states of charm and anticharm quarks, known as charmonia, have a rich spectroscopic structure that can be used to probe the dynamics of hadron production in high-energy hadron collisions. Here, the cross section ratio of excited (ψ(2S)) and ground state (J/ψ) vector mesons is measured as a function of the charged-particle multiplicity in proton-lead (pPb) collisions at a center-of-mass (CM) energy per nucleon pair of 8.16 TeV. The data corresponding to an integrated luminosity of 175 nb^{-1} were collected using the CMS detector. The ratio is measured separately for prompt and nonprompt charmonia in the transverse momentum range 6.5
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