Evidence of Spin-Orbital Angular Momentum Interactions in Relativistic Heavy-Ion Collisions

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F20%3A00531350" target="_blank" >RIV/61389005:_____/20:00531350 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68378271:_____/20:00531350 RIV/68407700:21340/20:00342797

Výsledek na webu

<a href="https://doi.org/10.1103/PhysRevLett.125.012301" target="_blank" >https://doi.org/10.1103/PhysRevLett.125.012301</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevLett.125.012301" target="_blank" >10.1103/PhysRevLett.125.012301</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Evidence of Spin-Orbital Angular Momentum Interactions in Relativistic Heavy-Ion Collisions

Popis výsledku v původním jazyce

The first evidence of spin alignment of vector mesons (K*(0) and phi) in heavy-ion collisions at the Large Hadron Collider (LHC) is reported. The spin density matrix element rho(00) is measured at midrapidity (vertical bar y vertical bar < 0.5) in Pb-Pb collisions at a center-of-mass energy root(s)NNof 2.76 TeV with the ALICE detector. rho(00) values are found to be less than 1/3 (1/3 implies no spin alignment) at low transverse momentum (p(T) < 2 GeV / c) for K*(0) and phi at a level of 3 sigma and 2 sigma, respectively. No significant spin alignment is observed for the K-S(0) meson (spin = 0) in Pb-Pb collisions and for the vector mesons in pp collisions. The measured spin alignment is unexpectedly large but qualitatively consistent with the expectation from models which attribute it to a polarization of quarks in the presence of angular momentum in heavy-ion collisions and a subsequent hadronization by the process of recombination.

Název v anglickém jazyce

Evidence of Spin-Orbital Angular Momentum Interactions in Relativistic Heavy-Ion Collisions

Popis výsledku anglicky

The first evidence of spin alignment of vector mesons (K*(0) and phi) in heavy-ion collisions at the Large Hadron Collider (LHC) is reported. The spin density matrix element rho(00) is measured at midrapidity (vertical bar y vertical bar < 0.5) in Pb-Pb collisions at a center-of-mass energy root(s)NNof 2.76 TeV with the ALICE detector. rho(00) values are found to be less than 1/3 (1/3 implies no spin alignment) at low transverse momentum (p(T) < 2 GeV / c) for K*(0) and phi at a level of 3 sigma and 2 sigma, respectively. No significant spin alignment is observed for the K-S(0) meson (spin = 0) in Pb-Pb collisions and for the vector mesons in pp collisions. The measured spin alignment is unexpectedly large but qualitatively consistent with the expectation from models which attribute it to a polarization of quarks in the presence of angular momentum in heavy-ion collisions and a subsequent hadronization by the process of recombination.

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

2020

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

—

Svazek periodika

125

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

12

Strana od-do

012301

Kód UT WoS článku

000544122900003

EID výsledku v databázi Scopus

2-s2.0-85087940641