Measurement of the underlying event activity at the LHC with √ s = 7 TeV and comparison with √ s = 0.9 TeV

Measurement of the underlying event activity at the LHC with √ s = 7 TeV and comparison with √ s = 0.9 TeV

A measurement of the underlying activity in events with a jet of transverse momentum in the several GeV region is performed in proton-proton collisions at √ s = 0:9 and 7TeV, using data collected by the CMS experiment at the LHC. The production of charged particles with pseudorapidity |η|<2 and t...

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Bibliographic Details
Main Authors: The CMS Collaboration, Alver, Burak Han, Bauer, Gerry P, Bendavid, Joshua L., Busza, Wit, Butz, Erik M., Cali, Ivan Amos, Chan, M., Dutta, Valentina, Everaerts, Pieter Bruno Bart, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Hahn, Kristian Allan, Harris, Philip Coleman, Kim, Y., Klute, Markus, Lee, Y.-J., Li, W., Loizides, Constantinos, Luckey Jr, P David, Ma, Teng, Nahn, Steven, Paus, Christoph M. E., Ralph, D., Roland, Christof E, Roland, Gunther M, Rudolph, Maja, Stephans, George S. F., Stockli, Fabian, Sumorok, Konstanty C, Sung, K., Wenger, Edward Allen, Wolf, Roger, Xie, Si, Yang, M., Yilmaz, Y., Yoon, A. S., Zanetti, Marco
Other Authors: Massachusetts Institute of Technology. Department of Physics
Format: Article
Language:English
Published: Springer Science and Business Media LLC 2022
Online Access:https://hdl.handle.net/1721.1/133878.2
Description
Summary:A measurement of the underlying activity in events with a jet of transverse momentum in the several GeV region is performed in proton-proton collisions at √ s = 0:9 and 7TeV, using data collected by the CMS experiment at the LHC. The production of charged particles with pseudorapidity |η|<2 and transverse momentum pT >0:5 GeV/c is studied in the azimuthal region transverse to that of the leading set of charged particles forming a track-jet. A significant growth of the average multiplicity and scalar-pT sum of the particles in the transverse region is observed with increasing pT of the leading trackjet, followed by a much slower rise above a few GeV/c. For track-jet pT larger than a few GeV/c, the activity in the transverse region is approximately doubled with a centreof- mass energy increase from 0:9 to 7TeV. Predictions of several QCD-inspired models as implemented in pythia are compared to the data.

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