The production of W bosons in association with two jets in proton–proton collisions at a centre-of-mass energy of √ s = 7TeV has been analysed for the presence of double-parton interactions using data corresponding to an integrated luminosity of 36pb − 1 , collected with the ATLAS detector at the Large Hadron Collider. The fraction of events arising from double-parton interactions, f ( D ) DP , has been measured through the p T balance between the two jets and amounts to f ( D ) DP = 0 . 08 ± 0 . 01 ( stat .) ± 0 . 02 ( sys .) for jets with transverse momentum p T > 20GeV and rapidity | y | < 2 . 8. This corresponds to a measurement of the effective area parameter for hard double-parton interactions of σ eff = 15 ± 3 ( stat .) +5 − 3 ( sys .) mb.
Measurement of hard double-parton interactions in W(→ℓν) + 2-jet events at √s=7 TeV with the ATLAS detector
CONTA, CLAUDIO;FRANCHINO, SILVIA;FRATERNALI, MARCO;LIVAN, MICHELE;NEGRI, ANDREA;REBUZZI, DANIELA MARCELLA;RIMOLDI, ADELE;
2013-01-01
Abstract
The production of W bosons in association with two jets in proton–proton collisions at a centre-of-mass energy of √ s = 7TeV has been analysed for the presence of double-parton interactions using data corresponding to an integrated luminosity of 36pb − 1 , collected with the ATLAS detector at the Large Hadron Collider. The fraction of events arising from double-parton interactions, f ( D ) DP , has been measured through the p T balance between the two jets and amounts to f ( D ) DP = 0 . 08 ± 0 . 01 ( stat .) ± 0 . 02 ( sys .) for jets with transverse momentum p T > 20GeV and rapidity | y | < 2 . 8. This corresponds to a measurement of the effective area parameter for hard double-parton interactions of σ eff = 15 ± 3 ( stat .) +5 − 3 ( sys .) mb.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
