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

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

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 (|η[superscript jet]| < 2) and with transverse momentum 1 ≤ pT[superscript jet] < 100 GeV. The analysis uses a data...

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Bibliographic Details
Main Authors: Apyan, Aram, Barbieri, Richard Alexander, Baty, Austin Alan, Bierwagen, Katharina, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, Demiragli, Zeynep, Di Matteo, Leonardo, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Gulhan, Doga Can, Innocenti, Gian Michele, Klute, Markus, Kovalskyi, Dmytro, Lai, Yue Shi, Lee, Yen-Jie, Levin, Andrew Michael, Luckey Jr, P David, McGinn, Christopher Francis, Niu, Xinmei, Paus, Christoph M. E., Ralph, Duncan Kelley, Roland, Christof E, Roland, Gunther M, Stephans, George S. F., Sumorok, Konstanty C, Varma, Mukund Madhav, Velicanu, Dragos Alexandru, Veverka, Jan, Wang, J., Wang, Ta-Wei, Wyslouch, Boleslaw, Yang, Mingming, Wyslouch, Victoria
Other Authors: Massachusetts Institute of Technology. Department of Physics
Format: Article
Language:en_US
Published: Springer-Verlag/SISSA 2017
Online Access:http://hdl.handle.net/1721.1/106880
https://orcid.org/0000-0002-9418-6656
https://orcid.org/0000-0002-7945-005X
https://orcid.org/0000-0001-5310-3466
https://orcid.org/0000-0002-2622-8295
https://orcid.org/0000-0002-8590-2673
https://orcid.org/0000-0002-3831-9071
https://orcid.org/0000-0001-8521-737X
https://orcid.org/0000-0001-9236-6621
https://orcid.org/0000-0003-4511-0855
https://orcid.org/0000-0002-0869-5631
https://orcid.org/0000-0003-1486-606X
https://orcid.org/0000-0003-2593-7767
https://orcid.org/0000-0002-1136-6900
https://orcid.org/0000-0003-1281-0193
https://orcid.org/0000-0001-7842-1591
https://orcid.org/0000-0002-6047-4211
https://orcid.org/0000-0001-8983-2169
https://orcid.org/0000-0003-3106-4894
https://orcid.org/0000-0001-8261-8346
https://orcid.org/0000-0002-1260-777X
https://orcid.org/0000-0002-0899-7621
https://orcid.org/0000-0003-3681-0649
https://orcid.org/0000-0001-6332-5839
Description
Summary: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 (|η[superscript jet]| < 2) and with transverse momentum 1 ≤ pT[superscript jet] < 100 GeV. The analysis uses a data sample collected at a centre-of-mass energy of 2.76 TeV with the CMS experiment at the LHC. The UE activity is measured as a function of pT[superscript jet] in terms of the average multiplicity and scalar sum of transverse momenta (pT) of charged particles, with |η| < 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 7 TeV, and to predictions of several Monte Carlo event generators, providing constraints on the modelling of the UE dynamics.

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