Direct-photon production in inelastic and high-multiplicity proton-proton collisions at √s=13 TeV
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F25%3A00638112" target="_blank" >RIV/61389005:_____/25:00638112 - isvavai.cz</a>
Alternative codes found
RIV/68378271:_____/25:00638112
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S037026932500406X" target="_blank" >https://www.sciencedirect.com/science/article/pii/S037026932500406X</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.physletb.2025.139645" target="_blank" >10.1016/j.physletb.2025.139645</a>
Alternative languages
Result language
angličtina
Original language name
Direct-photon production in inelastic and high-multiplicity proton-proton collisions at √s=13 TeV
Original language description
In this letter, we present the first measurement of direct photons at the transverse momentum of 1 < P-T < 6 GeV/c at midrapidity vertical bar eta vertical bar < 0.8 in inelastic and high-multiplicity proton-proton collisions at a centre-of-mass energy of root s = 13 TeV. The fraction of virtual direct photons in the inclusive virtual photon spectrum is obtained from a fit to the dielectron invariant mass spectrum. In the limit of zero invariant mass, this fraction is equal to the relative contribution of real direct photons in the inclusive real photon spectrum. Contributions from decays of light-flavour neutral mesons are estimated using independent measurements in proton-proton collisions at the same energy and the same event class. For the first time at the LHC energies, a direct-photon signal is observed at low p(T) in both inelastic and high-multiplicity event classes, with a significance of 3.2 sigma and 1.9 sigma in terms of standard deviations, correspondingly. The yield of direct photons in inelastic pp collisions is compared to perturbative QCD calculations. The integrated photon yield is studied as a function of charged-particle multiplicity and is compared to the results from other experiments and theoretical calculations. The results show a significant increase of direct-photon yield with charged-particle multiplicity.
Czech name
—
Czech description
—
Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
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
Physics Letters. B
ISSN
0370-2693
e-ISSN
1873-2445
Volume of the periodical
868
Issue of the periodical within the volume
September
Country of publishing house
NL - THE KINGDOM OF THE NETHERLANDS
Number of pages
16
Pages from-to
139645
UT code for WoS article
001525577300001
EID of the result in the Scopus database
2-s2.0-105008771873