Observation of strangeness enhancement with charmed mesons in high-multiplicity <math display="inline"><mi>p</mi><mi>Pb</mi></math> collisions at <math display="inline"><msqrt><msub><mi>s</mi><mrow><mi>NN</mi></mrow></msub></msqrt><mo>=</mo><mn>8.16</mn><mtext> </mtext><mtext> </mtext><mi>TeV</mi></math>

Aaij, Roel; Abdelmotteleb, Ahmed Sameh Wagih; Abellan Beteta, Carlos; Abudinén, Fernando Jesus; Ackernley, Thomas; Adeva, Bernardo; Adinolfi, Marco; Adlarson, Patrik Harri; Afsharnia, Hossein; Agapopoulou, Christina

doi:10.1103/PhysRevD.110.L031105

Observation of strangeness enhancement with charmed mesons in high-multiplicity $p Pb$ collisions at $\sqrt{s_{NN}} = 8.16 TeV$

LHCb

Collaboration

Nov 14, 2023

14 pages

Published in:

Phys.Rev.D 110 (2024) 3, L031105

Published: Aug 1, 2024

e-Print:

2311.08490 [hep-ex]

DOI:

10.1103/PhysRevD.110.L031105 (publication)

Report number:

LHCb-PAPER-2023-021,
CERN-EP-2023-236

Experiments:

CERN-LHC-LHCb

View in:

reference search18 citations

Citations per year

Abstract: (APS)

The production of prompt

D_{s}^{+}

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

\sqrt{s_{NN}} = 8.16 TeV

. The nuclear modification factors of both

D_{s}^{+}

and

D^{+}

mesons are determined as a function of transverse momentum,

p_{T}

, and rapidity. In addition, the

D_{s}^{+}

to

D^{+}

cross section ratio is measured as a function of the primary charged particle multiplicity in the event. An enhanced

D_{s}^{+}

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.

Note:

All figures and tables, along with machine-readable versions and any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2023-021.html (LHCb public pages)

p nucleus: interaction
lead
D+: direct production
D/s+: direct production
strangeness: enhancement
quark: hadronization
cross section: ratio: measured
charged particle: multiplicity
quark: coalescence
rapidity dependence

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