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

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Author(s)

The CMS Collaboration; Alver, Burak Han; Bauer, Gerry P; Bendavid, Joshua L.; Busza, Wit; ... Show more

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Abstract

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.

Date issued

2011

URI

https://hdl.handle.net/1721.1/133878.2

Department

Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science

Journal

Journal of High Energy Physics

Publisher

Springer Science and Business Media LLC

Citation

Chatrchyan, S., et al. "Measurement of the Underlying Event Activity at the Lhc with Root S=7 Tev and Comparison with Root S=0.9 Tev." Journal of High Energy Physics 9 (2011).

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2	1721.1/133878.2*	2022-12-15T20:48:01Z	Metadata changed: Verified or entered author name and department authority metadata.
1	1721.1/133878	2021-10-27T19:57:05Z

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