The production of prompt Ds+ and D+ mesons is measured by the LHCb experiment in proton-lead (p Pb) 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 √s_NN = 8.16 TeV. The nuclear modification factors of both Ds+ and D+ mesons are determined as a function of transverse momentum, p_T, and rapidity. In addition, the Ds+ to D+ cross-section ratio is measured as a function of the charged particle multiplicity in the event. An enhanced Ds+ to D+ production in high-multiplicity events is observed for the whole measured p_T range, in particular at low p_T 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 p Pb 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.

Aaij, R., Abdelmotteleb, A. s. w., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adeva, B., et al. (2024). Observation of strangeness enhancement with charmed mesons in high-multiplicity p Pb collisions at √s_NN = 8.16 TeV. PHYSICAL REVIEW D, 110(3), 1-14 [10.1103/physrevd.110.l031105].

Observation of strangeness enhancement with charmed mesons in high-multiplicity p Pb collisions at √s_NN = 8.16 TeV

Carbone, A.;Ferrari, F.;Galli, D.;Patrignani, C.;Spedicato, E.;Villa, A.;
2024

Abstract

The production of prompt Ds+ and D+ mesons is measured by the LHCb experiment in proton-lead (p Pb) 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 √s_NN = 8.16 TeV. The nuclear modification factors of both Ds+ and D+ mesons are determined as a function of transverse momentum, p_T, and rapidity. In addition, the Ds+ to D+ cross-section ratio is measured as a function of the charged particle multiplicity in the event. An enhanced Ds+ to D+ production in high-multiplicity events is observed for the whole measured p_T range, in particular at low p_T 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 p Pb 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.
2024
Aaij, R., Abdelmotteleb, A. s. w., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adeva, B., et al. (2024). Observation of strangeness enhancement with charmed mesons in high-multiplicity p Pb collisions at √s_NN = 8.16 TeV. PHYSICAL REVIEW D, 110(3), 1-14 [10.1103/physrevd.110.l031105].
Aaij, R.; Abdelmotteleb, A.  s.  w.; Abellan Beteta, C.; Abudinén, F.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Adlarson, P.; Afsharnia, H.; Agapopoulo...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/1002470
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