Evidence for light-by-light scattering in heavy-ion collisions with the ATLAS detector at the LHC

Kód výsledku v IS VaVaI

RIV/68378271:_____/17:00487153 - isvavai.cz

Nalezeny alternativní kódy

RIV/68407700:21220/17:00319723 RIV/68407700:21340/17:00319723 RIV/68407700:21670/17:00319723 RIV/00216208:11320/17:10369440 RIV/61989592:15310/17:73583764

Výsledek na webu

http://dx.doi.org/10.1038/NPHYS4208

DOI - Digital Object Identifier

10.1038/NPHYS4208

Jazyk výsledku

angličtina

Název v původním jazyce

Evidence for light-by-light scattering in heavy-ion collisions with the ATLAS detector at the LHC

Popis výsledku v původním jazyce

Light-by-light scattering (γγ→γγ) is a quantum-mechanical process that is forbidden in the classical theory of electrodynamics. This reaction is accessible at the Large Hadron Collider thanks to the large electromagnetic field strengths generated by ultra-relativistic colliding lead (Pb) ions. Using 480 μb−1 of Pb+Pb collision data recorded at a centre-of-mass energy per nucleon pair of 5.02 TeV by the ATLAS detector, the ATLAS Collaboration reports evidence for the γγ→γγ reaction. A total of 13 candidate events are observed with an expected background of 2.6±0.7 events. After background subtraction and analysis corrections, the fiducial cross section of the process Pb+Pb(γγ)→Pb(∗)+Pb(∗)γγ, for photon transverse energy ET>3 GeV, photon absolute pseudorapidity |η|<2.4, diphoton invariant mass greater than 6 GeV, diphoton transverse momentum lower than 2 GeV and diphoton acoplanarity below 0.01, is measured to be 70 ± 24 (stat.) ± 17 (syst.) nb, which is in agreement with Standard Model predictions.n

Název v anglickém jazyce

Evidence for light-by-light scattering in heavy-ion collisions with the ATLAS detector at the LHC

Popis výsledku anglicky

Light-by-light scattering (γγ→γγ) is a quantum-mechanical process that is forbidden in the classical theory of electrodynamics. This reaction is accessible at the Large Hadron Collider thanks to the large electromagnetic field strengths generated by ultra-relativistic colliding lead (Pb) ions. Using 480 μb−1 of Pb+Pb collision data recorded at a centre-of-mass energy per nucleon pair of 5.02 TeV by the ATLAS detector, the ATLAS Collaboration reports evidence for the γγ→γγ reaction. A total of 13 candidate events are observed with an expected background of 2.6±0.7 events. After background subtraction and analysis corrections, the fiducial cross section of the process Pb+Pb(γγ)→Pb(∗)+Pb(∗)γγ, for photon transverse energy ET>3 GeV, photon absolute pseudorapidity |η|<2.4, diphoton invariant mass greater than 6 GeV, diphoton transverse momentum lower than 2 GeV and diphoton acoplanarity below 0.01, is measured to be 70 ± 24 (stat.) ± 17 (syst.) nb, which is in agreement with Standard Model predictions.n

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10303 - Particles and field 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

Nature Physics

ISSN

1745-2473

e-ISSN

—

Svazek periodika

13

Číslo periodika v rámci svazku

9

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

16

Strana od-do

852-868

Kód UT WoS článku

000409235100017

EID výsledku v databázi Scopus

2-s2.0-85028933316