Exclusive ????/????, ????(2????), and ????+????− pair production in Au+Au ultraperipheral collisions at the BNL Relativistic Heavy Ion Collider
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F24%3A00602056" target="_blank" >RIV/61389005:_____/24:00602056 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1103/PhysRevC.110.014911" target="_blank" >https://doi.org/10.1103/PhysRevC.110.014911</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevC.110.014911" target="_blank" >10.1103/PhysRevC.110.014911</a>
Alternative languages
Result language
angličtina
Original language name
Exclusive ????/????, ????(2????), and ????+????− pair production in Au+Au ultraperipheral collisions at the BNL Relativistic Heavy Ion Collider
Original language description
Measurements of exclusive ????/????, ????(2????), and electron-positron (????+????−) pair photoproduction in Au+Au ultraperipheral collisions are reported by the STAR experiment at √????NN=200GeV. We report several first measurements at the BNL Relativistic Heavy Ion Collider, which are (i) ????/???? photoproduction with large momentum transfer up to 2.2(GeV/????)2, (ii) coherent ????/???? photoproduction associated with neutron emissions from nuclear breakup, (iii) the rapidity dependence of incoherent ????/???? photoproduction, (iv) the ????(2????) photoproduction cross section at midrapidity, and (v) ????+????− pair photoproduction up to high invariant mass of 6GeV/????2. For measurement (ii), the coherent ????/???? total cross section of ????+Au→J/????+Au as a function of the center-of-mass energy ???????????? has been obtained without photon energy ambiguities. The data are quantitatively compared with the Monte Carlo models STARlight, Sartre, BeAGLE, and theoretical calculations of gluon saturation with color glass condensate, nuclear shadowing with leading twist approximation, quantum electrodynamics, and the next-to-leading-order perturbative QCD. At the photon-nucleon center-of-mass energy of 25.0 GeV, the coherent and incoherent ????/???? cross sections of Au nuclei are found to be 71%±10% and 36%±7%, respectively, of that of free protons. These data provide an important experimental constraint for nuclear parton distribution functions and a unique opportunity to advance the understanding of the nuclear modification effect at the top RHIC energy.
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
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Physical Review C
ISSN
2469-9985
e-ISSN
2469-9993
Volume of the periodical
110
Issue of the periodical within the volume
1
Country of publishing house
US - UNITED STATES
Number of pages
20
Pages from-to
014911
UT code for WoS article
001355881200001
EID of the result in the Scopus database
2-s2.0-85200669758