Study of hard double-parton scattering in four-jet events in pp collisions at SQUARE ROOTs=7 TeV with the ATLAS experiment

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F16%3A33162055" target="_blank" >RIV/61989592:15310/16:33162055 - isvavai.cz</a>

Výsledek na webu

<a href="http://link.springer.com/article/10.1007%2FJHEP11%282016%29110" target="_blank" >http://link.springer.com/article/10.1007%2FJHEP11%282016%29110</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/JHEP11(2016)110" target="_blank" >10.1007/JHEP11(2016)110</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Study of hard double-parton scattering in four-jet events in pp collisions at SQUARE ROOTs=7 TeV with the ATLAS experiment

Popis výsledku v původním jazyce

Inclusive four-jet events produced in proton-proton collisions at a centre-of-mass energy of s=7 TeV are analysed for the presence of hard double-parton scattering using data corresponding to an integrated luminosity of 37.3 pbMINUS SIGN 1, collected with the ATLAS detector at the LHC. The contribution of hard double-parton scattering to the production of four-jet events is extracted using an artificial neural network, assuming that hard double-parton scattering can be approximated by an uncorrelated overlaying of dijet events. For events containing at least four jets with transverse momentum pT GREATER-THAN OR EQUAL TO 20 GeV and pseudorapidity |η| LESS-THAN OR EQUAL TO 4.4, and at least one having pT GREATER-THAN OR EQUAL TO 42.5 GeV, the contribution of hard double-parton scattering is estimated to be fDPS = 0.092MINUS SIGN 0.011+ 0.005(stat.)MINUS SIGN 0.037+ 0.033(syst.). After combining this measurement with those of the inclusive dijet and four-jet cross-sections in the appropriate phase space regions, the effective cross-section, σeff , was determined to be σeff = 14. 9MINUS SIGN 1.0+ 1.2(stat.)MINUS SIGN 3.8+ 5.1(syst.) mb. This result is consistent within the quoted uncertainties with previous measurements of σeff , performed at centre-of-mass energies between 63 GeV and 8 TeV using various final states, and it corresponds to 21MINUS SIGN 6+ 7 % of the total inelastic cross-section measured at s=7 TeV. The distributions of the observables sensitive to the contribution of hard double-parton scattering, corrected for detector effects, are also provided.

Název v anglickém jazyce

Study of hard double-parton scattering in four-jet events in pp collisions at SQUARE ROOTs=7 TeV with the ATLAS experiment

Popis výsledku anglicky

Inclusive four-jet events produced in proton-proton collisions at a centre-of-mass energy of s=7 TeV are analysed for the presence of hard double-parton scattering using data corresponding to an integrated luminosity of 37.3 pbMINUS SIGN 1, collected with the ATLAS detector at the LHC. The contribution of hard double-parton scattering to the production of four-jet events is extracted using an artificial neural network, assuming that hard double-parton scattering can be approximated by an uncorrelated overlaying of dijet events. For events containing at least four jets with transverse momentum pT GREATER-THAN OR EQUAL TO 20 GeV and pseudorapidity |η| LESS-THAN OR EQUAL TO 4.4, and at least one having pT GREATER-THAN OR EQUAL TO 42.5 GeV, the contribution of hard double-parton scattering is estimated to be fDPS = 0.092MINUS SIGN 0.011+ 0.005(stat.)MINUS SIGN 0.037+ 0.033(syst.). After combining this measurement with those of the inclusive dijet and four-jet cross-sections in the appropriate phase space regions, the effective cross-section, σeff , was determined to be σeff = 14. 9MINUS SIGN 1.0+ 1.2(stat.)MINUS SIGN 3.8+ 5.1(syst.) mb. This result is consistent within the quoted uncertainties with previous measurements of σeff , performed at centre-of-mass energies between 63 GeV and 8 TeV using various final states, and it corresponds to 21MINUS SIGN 6+ 7 % of the total inelastic cross-section measured at s=7 TeV. The distributions of the observables sensitive to the contribution of hard double-parton scattering, corrected for detector effects, are also provided.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BF - Elementární částice a fyzika vysokých energií

OECD FORD obor

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Projekt

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

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Název periodika

Journal of High Energy Physics (online)

ISSN

1029-8479

e-ISSN

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Svazek periodika

2016

Číslo periodika v rámci svazku

110

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

52

Strana od-do

"110-1"-"110-52"

Kód UT WoS článku

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EID výsledku v databázi Scopus

2-s2.0-84997501206