Measurement of e(+)e(-) Momentum and Angular Distributions from Linearly Polarized Photon Collisions

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F21%3A00544731" target="_blank" >RIV/61389005:_____/21:00544731 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68407700:21340/21:00351246

Výsledek na webu

<a href="https://doi.org/10.1103/PhysRevLett.127.052302" target="_blank" >https://doi.org/10.1103/PhysRevLett.127.052302</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevLett.127.052302" target="_blank" >10.1103/PhysRevLett.127.052302</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Measurement of e(+)e(-) Momentum and Angular Distributions from Linearly Polarized Photon Collisions

Popis výsledku v původním jazyce

The Breit-Wheeler process which produces matter and antimatter from photon collisions is experimentally investigated through the observation of 6085 exclusive electron-positron pairs in ultraperipheral Au + Au collisions at root s(NN) = 200 GeV. The measurements reveal a large fourth-order angular modulation of cos4 Delta phi = (16.8 +/- 2.5)% and smooth invariant mass distribution absent of vector mesons (phi, omega, and rho) at the experimental limit of <= 0.2% of the observed yields. The differential cross section as a function of e(+)e(-) pair transverse momentum P-perpendicular to peaks at low value with root < P-perpendicular to(2)> = 38.1 +/- 0.9 MeV and displays a significant centrality dependence. These features are consistent with QED calculations for the collision of linearly polarized photons quantized from the extremely strong electromagnetic fields generated by the highly charged Au nuclei at ultrarelativistic speed. The experimental results have implications for vacuum birefringence and for mapping the magnetic field which is important for emergent QCD phenomena.

Název v anglickém jazyce

Measurement of e(+)e(-) Momentum and Angular Distributions from Linearly Polarized Photon Collisions

Popis výsledku anglicky

The Breit-Wheeler process which produces matter and antimatter from photon collisions is experimentally investigated through the observation of 6085 exclusive electron-positron pairs in ultraperipheral Au + Au collisions at root s(NN) = 200 GeV. The measurements reveal a large fourth-order angular modulation of cos4 Delta phi = (16.8 +/- 2.5)% and smooth invariant mass distribution absent of vector mesons (phi, omega, and rho) at the experimental limit of <= 0.2% of the observed yields. The differential cross section as a function of e(+)e(-) pair transverse momentum P-perpendicular to peaks at low value with root < P-perpendicular to(2)> = 38.1 +/- 0.9 MeV and displays a significant centrality dependence. These features are consistent with QED calculations for the collision of linearly polarized photons quantized from the extremely strong electromagnetic fields generated by the highly charged Au nuclei at ultrarelativistic speed. The experimental results have implications for vacuum birefringence and for mapping the magnetic field which is important for emergent QCD phenomena.

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

2021

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

127

Číslo periodika v rámci svazku

5

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

9

Strana od-do

052302

Kód UT WoS článku

000679181800007

EID výsledku v databázi Scopus

2-s2.0-85112679069