Measurement of isolated prompt photon production in pp and p-Pb collisions at the LHC
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F25%3A00645512" target="_blank" >RIV/61389005:_____/25:00645512 - isvavai.cz</a>
Alternative codes found
RIV/68378271:_____/25:00645512 RIV/68407700:21340/25:00389223
Result on the web
<a href="https://link.springer.com/article/10.1140/epjc/s10052-025-14802-w" target="_blank" >https://link.springer.com/article/10.1140/epjc/s10052-025-14802-w</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1140/epjc/s10052-025-14802-w" target="_blank" >10.1140/epjc/s10052-025-14802-w</a>
Alternative languages
Result language
angličtina
Original language name
Measurement of isolated prompt photon production in pp and p-Pb collisions at the LHC
Original language description
This paper presents the measurement of the isolated prompt photon inclusive production cross section in pp and p–Pb collisions by the ALICE Collaboration at the LHC. The measurement is performed in p–Pb collisions at centre-of-mass energies per nucleon pair of sNN=5.02TeV and 8.16 TeV, as well as in pp collisions at s=5.02TeV and 8 TeV. The cross section is obtained at midrapidity (|y|<0.7) using a charged-track based isolation momentum pTiso, ch<1.5GeV/c in a cone with radius R=0.4. The data for both collision systems are well reproduced by perturbative QCD (pQCD) calculations at next-to-leading order (NLO) using recent parton distribution functions for free (PDF) and bound (nPDF) nucleons. Furthermore, the nuclear modification factor RpA for both collision energies is consistent with unity for pT>20GeV/c. However, deviations from unity (RpA<1) of up to 20% are observed for pT<20GeV/c with limited significance, indicating the possible presence of nuclear effects in the initial state of the collision. The suppression increases with decreasing pT with a significance of 2.3σ for a non-zero slope and yields RpA<1 with a significance of 1.8σ at sNN=8.16TeV for pT<20GeV/c. In addition, a significance of 1.1σ is observed for RpA<1 at the lower collision energy sNN=5.02TeV for pT<14GeV/c. The magnitude and shape of the suppression are consistent with pQCD predictions at NLO using nPDFs that incorporate nuclear shadowing effects in the Pb nucleus.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10304 - Nuclear physics
Result continuities
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
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
European Physical Journal C
ISSN
1434-6044
e-ISSN
1434-6052
Volume of the periodical
85
Issue of the periodical within the volume
12
Country of publishing house
DE - GERMANY
Number of pages
21
Pages from-to
1407
UT code for WoS article
001670443300001
EID of the result in the Scopus database
2-s2.0-105026609121