$\Lambda^+_c$ Production and Baryon-to-Meson Ratios in pp and p-Pb Collisions at $\sqrt {s_{NN}}$=5.02 TeV at the LHC - INSPIRE

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$\Lambda^+_c$ Production and Baryon-to-Meson Ratios in pp and p-Pb Collisions at $\sqrt {s_{NN}}$ =5.02 TeV at the LHC

ALICE

Collaboration

Nov 11, 2020

13 pages

Published in:

Phys.Rev.Lett. 127 (2021) 20, 202301

Published: Nov 9, 2021

e-Print:

2011.06078 [nucl-ex]

DOI:

10.1103/PhysRevLett.127.202301 (publication)

Report number:

CERN-EP-2020-217

Experiments:

CERN-LHC-ALICE

View in:

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Abstract: (APS)

The prompt production of the charm baryon

Λ_{c}^{+}

and the

Λ_{c}^{+} / D^{0}

production ratios were measured at midrapidity with the ALICE detector in

p p

and

p

-Pb collisions at

\sqrt{s_{NN}} = 5.02 TeV

. These new measurements show a clear decrease of the

Λ_{c}^{+} / D^{0}

ratio with increasing transverse momentum (

p_{T}

) in both collision systems in the range

2 < p_{T} < 12 GeV / c

, exhibiting similarities with the light-flavor baryon-to-meson ratios

p / π

and

Λ / K_{S}^{0}

. At low

p_{T}

, predictions that include additional color-reconnection mechanisms beyond the leading-color approximation, assume the existence of additional higher-mass charm-baryon states, or include hadronization via coalescence can describe the data, while predictions driven by charm-quark fragmentation processes measured in

e^{+} e^{-}

and

e^{-} p

collisions significantly underestimate the data. The results presented in this Letter provide significant evidence that the established assumption of universality (colliding-system independence) of parton-to-hadron fragmentation is not sufficient to describe charm-baryon production in hadronic collisions at LHC energies.

Note:

20 pages, 2 captioned figures, authors from page 14, published version, figures at http://alice-publications.web.cern.ch/node/6702

Lambda/c+: production
charmed baryon: direct production
hadron hadron: interaction
fragmentation
CERN LHC Coll
transverse momentum
hadronization
universality
coalescence
ALICE

References(58)

Figures(0)

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