Abstract
The first evidence for X(3872) production in relativistic heavy ion collisions, with a significance of 4.2 standard deviations, is reported. The X(3872) production is studied in lead-lead (PbPb) collisions at a center-of-mass energy of √SNN = 5.02 TeV per nucleon pair with the CMS detector. The measurement is performed in the rapidity and transverse momentum ranges |y| < 1.6 and 15 < pT < 50 GeV/c. The prompt X(3872) to ψ(2S) yield ratio is found to be ρPbPb = 1.08 ± 0.49(stat.) ± 0.52(syst.), to be compared with typical values of 0.1 for pp collisions. This provides new input to theoretical models of the X(3872) production mechanism, and of the nature of this exotic state.
Highlights
Collisions the CMS at a center-of-mass detector
The recent large data 5.02 TeV per nucleon set of lead-lead (PbPb) collisions at a center-of-mass pair, delivered by the Large Hadron Collider (LHC) at energy CERN
At the end of 2018, opened new opportunities to probe the nature of this exotic state [19,20,21,22]
Summary
Collisions the CMS at a center-of-mass detector. The measurement is performed in the rapidity and transverse momentum ranges |y| < 1.6 and 15 < pT < 50 GeV/c. It is expected that in relativistic heavy ion collisions, the formation of the QGP could enhance or suppress the production of the X(3872) particle. The nonprompt X(3872) component is related to the beauty quark energy loss and medium-modified B hadron production in heavy ion collisions, which has been studied with b-jets [30] and fully reconstructed B mesons [31].
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