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 offfiffiffiffiffiffiffi p ¼ 8.16 TeV. The nuclear modification factors of both sNN 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 / Aaij, R., Abdelmotteleb, A. s. w., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adeva, B., Adinolfi, M., Adlarson, P., Afsharnia, H., Agapopoulou, C., Aidala, C. a., Ajaltouni, Z., Akar, S., Akiba, K., Albicocco, P., Albrecht, J., Alessio, F., Alexander, M., Alfonso Albero, A., Aliouche, Z., et al.. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 110:3(2024). [10.1103/physrevd.110.l031105]

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

Casse, G.;Sarti, A.;
2024

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 offfiffiffiffiffiffiffi p ¼ 8.16 TeV. The nuclear modification factors of both sNN 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.
2024
charmed baryons, limits on production of particles, charmed quarks, experimental tests
01 Pubblicazione su rivista::01a Articolo in rivista
Observation of strangeness enhancement with charmed mesons in high-multiplicity pPb collisions at sNN=8.16  TeV / Aaij, R., Abdelmotteleb, A. s. w., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adeva, B., Adinolfi, M., Adlarson, P., Afsharnia, H., Agapopoulou, C., Aidala, C. a., Ajaltouni, Z., Akar, S., Akiba, K., Albicocco, P., Albrecht, J., Alessio, F., Alexander, M., Alfonso Albero, A., Aliouche, Z., et al.. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 110:3(2024). [10.1103/physrevd.110.l031105]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1720484
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