A measurement of the underlying event (UE) activity in proton-proton collisions is performed using events with charged-particle jets produced in the central pseudorapidity region (|jet| < 2) and with transverse momentum 1 pjet T < 100 GeV. The analysis uses a data sample collected at a centre-of-mass energy of 2.76TeV with the CMS experiment at the LHC. The UE activity is measured as a function of pjet T in terms of the average multiplicity and scalar sum of transverse momenta (pT) of charged particles, with || < 2 and pT > 0.5 GeV, in the azimuthal region transverse to the highest pT jet direction. By further dividing the transverse region into two regions of smaller and larger activity, various components of the UE activity are separated. The measurements are compared to previous results at 0.9 and 7TeV, and to predictions of several Monte Carlo event generators, providing constraints on the modelling of the UE dynamics.

Measurement of the underlying event activity using charged-particle jets in proton-proton collisions at √s=2.76 TeV

Sola, V.;AMAPANE, Nicola Carlo;ARGIRO', Stefano;BELLAN, Riccardo;COSTA, Marco;COVARELLI, Roberto;MIGLIORE, Ernesto;MONACO, Vincenzo;OBERTINO, Maria Margherita;ROMERO, Alessandra;SACCHI, Roberto;SOLANO, Ada Maria;
2015-01-01

Abstract

A measurement of the underlying event (UE) activity in proton-proton collisions is performed using events with charged-particle jets produced in the central pseudorapidity region (|jet| < 2) and with transverse momentum 1 pjet T < 100 GeV. The analysis uses a data sample collected at a centre-of-mass energy of 2.76TeV with the CMS experiment at the LHC. The UE activity is measured as a function of pjet T in terms of the average multiplicity and scalar sum of transverse momenta (pT) of charged particles, with || < 2 and pT > 0.5 GeV, in the azimuthal region transverse to the highest pT jet direction. By further dividing the transverse region into two regions of smaller and larger activity, various components of the UE activity are separated. The measurements are compared to previous results at 0.9 and 7TeV, and to predictions of several Monte Carlo event generators, providing constraints on the modelling of the UE dynamics.
2015
2015
9
137
169
http://link.springer.com/journal/13130
Hadron-Hadron Scattering; Particle correlations and fluctuations; Nuclear and High Energy Physics
The CMS collaboration, Null; Khachatryan, V.; Sirunyan, A.M.; Tumasyan, A.; Adam, W.; Asilar, E.; Bergauer, T.; Brandstetter, J.; Brondolin, E.; Dragi...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1578066
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