Observation of Strong Nuclear Suppression in Exclusive ????/???? Photoproduction in Au+Au Ultraperipheral Collisions at RHIC

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F24%3A00602060" target="_blank" >RIV/61389005:_____/24:00602060 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1103/PhysRevLett.133.052301" target="_blank" >https://doi.org/10.1103/PhysRevLett.133.052301</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevLett.133.052301" target="_blank" >10.1103/PhysRevLett.133.052301</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Observation of Strong Nuclear Suppression in Exclusive ????/???? Photoproduction in Au+Au Ultraperipheral Collisions at RHIC

Popis výsledku v původním jazyce

We report a measurement of exclusive ????/???? and ????⁡(2⁢????) photoproduction in Au+Au ultraperipheral collisions at √????NN=200  GeV using the STAR detector. For the first time, (i) the ????⁡(2⁢????) photoproduction in midrapidity at the Relativistic Heavy-Ion Collider has been experimentally measured. (ii) nuclear suppression factors are measured for both the coherent and incoherent ????/???? production. At average 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. The stronger suppression observed in the incoherent production provides a new experimental handle to study the initial-state parton density in heavy nuclei. Data are compared with theoretical models quantitatively.

Název v anglickém jazyce

Observation of Strong Nuclear Suppression in Exclusive ????/???? Photoproduction in Au+Au Ultraperipheral Collisions at RHIC

Popis výsledku anglicky

We report a measurement of exclusive ????/???? and ????⁡(2⁢????) photoproduction in Au+Au ultraperipheral collisions at √????NN=200  GeV using the STAR detector. For the first time, (i) the ????⁡(2⁢????) photoproduction in midrapidity at the Relativistic Heavy-Ion Collider has been experimentally measured. (ii) nuclear suppression factors are measured for both the coherent and incoherent ????/???? production. At average 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. The stronger suppression observed in the incoherent production provides a new experimental handle to study the initial-state parton density in heavy nuclei. Data are compared with theoretical models quantitatively.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10304 - Nuclear physics

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

Kód důvěrnosti údajů

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

Název periodika

Physical Review Letters

ISSN

0031-9007

e-ISSN

1079-7114

Svazek periodika

133

Číslo periodika v rámci svazku

5

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

9

Strana od-do

052301

Kód UT WoS článku

001355893100001

EID výsledku v databázi Scopus

2-s2.0-85200667322