The production of prompt Dþ s and Dþ mesons is measured by the LHCb experiment in proton-lead (pPb) collisions in both the forward (1.5 < y < 4.0) and backward (−5.0 < y < −2.5) rapidity regions at a nucleon-nucleon center-of-mass energy of ffiffiffiffiffiffiffi sNN p ¼ 8.16 TeV. The nuclear modification factors of both Dþ s and Dþ mesons are determined as a function of transverse momentum, pT, and rapidity. In addition, the Dþ s to Dþ cross section ratio is measured as a function of the primary charged particle multiplicity in the event. An enhanced Dþ s to Dþ production in high-multiplicity events is observed for the whole measured pT range, in particular at low pT and backward rapidity, where the significance exceeds six standard deviations. This constitutes the first observation of strangeness enhancement in charm quark hadronization in high-multiplicity pPb collisions. The results are also qualitatively consistent with the presence of quark coalescence as an additional charm quark hadronization mechanism in high-multiplicity proton-lead collisions.

Observation of strangeness enhancement with charmed mesons in high-multiplicity pPb collisions at sNN=8.16  TeV

De Angelis, C.;Dettori, F.;Fabiano, F.;Manca, G.;Oldeman, R.;Saitta, B.;
2024-01-01

Abstract

The production of prompt Dþ s and Dþ mesons is measured by the LHCb experiment in proton-lead (pPb) collisions in both the forward (1.5 < y < 4.0) and backward (−5.0 < y < −2.5) rapidity regions at a nucleon-nucleon center-of-mass energy of ffiffiffiffiffiffiffi sNN p ¼ 8.16 TeV. The nuclear modification factors of both Dþ s and Dþ mesons are determined as a function of transverse momentum, pT, and rapidity. In addition, the Dþ s to Dþ cross section ratio is measured as a function of the primary charged particle multiplicity in the event. An enhanced Dþ s to Dþ production in high-multiplicity events is observed for the whole measured pT range, in particular at low pT and backward rapidity, where the significance exceeds six standard deviations. This constitutes the first observation of strangeness enhancement in charm quark hadronization in high-multiplicity pPb collisions. The results are also qualitatively consistent with the presence of quark coalescence as an additional charm quark hadronization mechanism in high-multiplicity proton-lead collisions.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11584/445351
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