Charm-quark fragmentation fractions and production cross section at midrapidity in pp collisions at the LHC

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F22%3A00553658" target="_blank" >RIV/68378271:_____/22:00553658 - isvavai.cz</a>

Alternative codes found

RIV/61389005:_____/22:00553658 RIV/68407700:21340/22:00363964

Result on the web

<a href="https://doi.org/10.1103/PhysRevD.105.L011103" target="_blank" >https://doi.org/10.1103/PhysRevD.105.L011103</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevD.105.L011103" target="_blank" >10.1103/PhysRevD.105.L011103</a>

Result language

angličtina

Original language name

Charm-quark fragmentation fractions and production cross section at midrapidity in pp collisions at the LHC

Original language description

Recent p(T)-integrated cross-section measurements of the ground-state charm mesons and baryons, D-0, D+, D-s(+), Lambda(+)(c), and Xi(0)(c) are used to evaluate the charm fragmentation fractions and production cross section per unit of rapidity at midrapidity (vertical bar y vertical bar < 0.5), in pp collisions at root s = 5.02 TeV at the LHC. The latter is d sigma(c<(c)over) (bar>)/dy vertical bar(vertical bar y vertical bar<0.5) = 1165 +/- 44(stat)(-101)(+131) (syst) mu b. These measurements were obtained for the first time in hadronic collisions at the LHC, including the charm baryon states, recently measured by ALICE at midrapidity. The charm fragmentation fractions differ significantly from the values measured in e(+)e(-) and ep collisions, providing evidence of the dependence of the parton-to-hadron fragmentation fractions on the collision system, indicating that the assumption of their universality is not supported by the measured cross sections. An increase of a factor of about 3.3 for the fragmentation fraction for the Lambda(+)(c) with a significance of 5 sigma between the values obtained in pp collisions and those obtained in e(+)e(-) (ep) collisions is reported. The fragmentation fraction for the Xi(0)(c) was obtained for the first time in any collision system. The measured fragmentation fractions were used to update the c (c) over bar cross sections per unit of rapidity at vertical bar y vertical bar < 0.5 at root s = 2.76 and 7 TeV, which are about 40% higher than the previously published results. The data were compared with perturbative-QCD calculations and lie at the upper edge of the theoretical bands.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10303 - Particles and field physics

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2022

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Physical Review D

ISSN

2470-0010

e-ISSN

2470-0029

Volume of the periodical

105

Issue of the periodical within the volume

1

Country of publishing house

US - UNITED STATES

Number of pages

14

Pages from-to

L011103

UT code for WoS article

000748867800001

EID of the result in the Scopus database

2-s2.0-85123772823