Coherent diffractive photoproduction of rho(0) mesons on gold nuclei at 200 GeV/nucleon-pair at the Relativistic Heavy Ion Collider

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F17%3A00482520" target="_blank" >RIV/61389005:_____/17:00482520 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68407700:21340/17:00318157

Výsledek na webu

<a href="http://dx.doi.org/10.1103/PhysRevC.96.054904" target="_blank" >http://dx.doi.org/10.1103/PhysRevC.96.054904</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevC.96.054904" target="_blank" >10.1103/PhysRevC.96.054904</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Coherent diffractive photoproduction of rho(0) mesons on gold nuclei at 200 GeV/nucleon-pair at the Relativistic Heavy Ion Collider

Popis výsledku v původním jazyce

The STAR Collaboration reports on the photoproduction of pi(+) pi(-) pairs in gold-gold collisions at a center-of-mass energy of 200 GeV/nucleon-pair. These pion pairs are produced when a nearly real photon emitted by one ion scatters from the other ion. nWe fit the pi(+) pi(-) invariant-mass spectrum with a combination of rho(0) and omega resonances and a direct pi(+) pi(-) continuum. This is the first observation of the omega in ultraperipheral collisions, and the first measurement of rho-omega interference at energies where photoproduction is dominated by Pomeron exchange. The omega amplitude is consistent with the measured gamma p -> omega p cross section, a classical Glauber calculation, and the omega -> pi(+) pi(-) branching ratio. The omega phase angle is similar to that observed at much lower energies, showing that the rho-omega phase difference does not depend significantly on photon energy. nThe rho(0) differential cross section d sigma/dt exhibits a clear diffraction pattern, compatible with scattering from a gold nucleus, with two minima visible. The positions of the diffractive minima agree better with the predictions of a quantum Glauber calculation that does not include nuclear shadowing than with a calculation that does include shadowing.

Název v anglickém jazyce

Coherent diffractive photoproduction of rho(0) mesons on gold nuclei at 200 GeV/nucleon-pair at the Relativistic Heavy Ion Collider

Popis výsledku anglicky

The STAR Collaboration reports on the photoproduction of pi(+) pi(-) pairs in gold-gold collisions at a center-of-mass energy of 200 GeV/nucleon-pair. These pion pairs are produced when a nearly real photon emitted by one ion scatters from the other ion. nWe fit the pi(+) pi(-) invariant-mass spectrum with a combination of rho(0) and omega resonances and a direct pi(+) pi(-) continuum. This is the first observation of the omega in ultraperipheral collisions, and the first measurement of rho-omega interference at energies where photoproduction is dominated by Pomeron exchange. The omega amplitude is consistent with the measured gamma p -> omega p cross section, a classical Glauber calculation, and the omega -> pi(+) pi(-) branching ratio. The omega phase angle is similar to that observed at much lower energies, showing that the rho-omega phase difference does not depend significantly on photon energy. nThe rho(0) differential cross section d sigma/dt exhibits a clear diffraction pattern, compatible with scattering from a gold nucleus, with two minima visible. The positions of the diffractive minima agree better with the predictions of a quantum Glauber calculation that does not include nuclear shadowing than with a calculation that does include shadowing.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10304 - Nuclear physics

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název periodika

Physical Review C

ISSN

2469-9985

e-ISSN

—

Svazek periodika

96

Číslo periodika v rámci svazku

5

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

12

Strana od-do

—

Kód UT WoS článku

000414957500004

EID výsledku v databázi Scopus

—