Measurement of the underlying event activity at the LHC with √s = 7 TeV and comparison with √s = 0:9 TeV

Chatrchyan, S.; Khachatryan, V.; Sirunyan, A.M.; Tumasyan, A.; Adam, W.; Bergauer, T.; Dragicevic, M.; Erö, J.; Fabjan, C.; Friedl, M.; Frühwirth, R.; Ghete, V.M.; Hammer, J.; Hänsel, S.; Hoch, M.; Hörmann, N.; Hrubec, J.; Jeitler, M.; Kiesenhofer, W.; Krammer, M.; Liko, D.; Mikulec, I.; Pernicka, M.; Rohringer, H.; Schöfbeck, R.; Strauss, J.; Taurok, A.; Teischinger, F.; Wagner, P.; Waltenberger, W.; Walzel, G.; Widl, E.; Wulz, C.-E.; Mossolov, V.; Shumeiko, N.; Suarez Gonzalez, J.; Bansal, S.; Benucci, L.; De Wolf, E.A.; Janssen, X.; Maes, J.; Maes, T.; Mucibello, L.; Ochesanu, S.; Roland, B.; Rougny, R.; Selvaggi, M.; Van Haevermaet, H.; Van Mechelen, P.; Van Remortel, N.

doi:10.1007/jhep09(2011)109

Measurement of the underlying event activity at the LHC with √s = 7 TeV and comparison with √s = 0:9 TeV

ArticleAçık Erişim

Özet

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.

Anahtar Kelimeler

Hadron-hadron scattering

RDL Kalıcı Bağlantı (PID)

https://rdlopen.rawdatalibrary.net/r/ebyu/15900Resmi atıflarda kullanılan kalıcı adres

DOI

https://doi.org/10.1007/jhep09(2011)109Yayıncı resmi DOI adresi

Tam Kayıt

Alan	Değer	Dil
dc.contributor.author	Chatrchyan, S.
dc.contributor.author	Khachatryan, V.
dc.contributor.author	Sirunyan, A.M.
dc.contributor.author	Tumasyan, A.
dc.contributor.author	Adam, W.
dc.contributor.author	Bergauer, T.
dc.contributor.author	Dragicevic, M.
dc.contributor.author	Erö, J.
dc.contributor.author	Fabjan, C.
dc.contributor.author	Friedl, M.
dc.contributor.author	Frühwirth, R.
dc.contributor.author	Ghete, V.M.
dc.contributor.author	Hammer, J.
dc.contributor.author	Hänsel, S.
dc.contributor.author	Hoch, M.
dc.contributor.author	Hörmann, N.
dc.contributor.author	Hrubec, J.
dc.contributor.author	Jeitler, M.
dc.contributor.author	Kiesenhofer, W.
dc.contributor.author	Krammer, M.
dc.contributor.author	Liko, D.
dc.contributor.author	Mikulec, I.
dc.contributor.author	Pernicka, M.
dc.contributor.author	Rohringer, H.
dc.contributor.author	Schöfbeck, R.
dc.contributor.author	Strauss, J.
dc.contributor.author	Taurok, A.
dc.contributor.author	Teischinger, F.
dc.contributor.author	Wagner, P.
dc.contributor.author	Waltenberger, W.
dc.contributor.author	Walzel, G.
dc.contributor.author	Widl, E.
dc.contributor.author	Wulz, C.-E.
dc.contributor.author	Mossolov, V.
dc.contributor.author	Shumeiko, N.
dc.contributor.author	Suarez Gonzalez, J.
dc.contributor.author	Bansal, S.
dc.contributor.author	Benucci, L.
dc.contributor.author	De Wolf, E.A.
dc.contributor.author	Janssen, X.
dc.contributor.author	Maes, J.
dc.contributor.author	Maes, T.
dc.contributor.author	Mucibello, L.
dc.contributor.author	Ochesanu, S.
dc.contributor.author	Roland, B.
dc.contributor.author	Rougny, R.
dc.contributor.author	Selvaggi, M.
dc.contributor.author	Van Haevermaet, H.
dc.contributor.author	Van Mechelen, P.
dc.contributor.author	Van Remortel, N.
dc.date.accessioned	2026-10-18T20:30:44.969805629Z
dc.date.available	2026-10-18T20:30:44.969805629Z
dc.date.issued	2011
dc.description.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.
dc.description.sponsorship	, (ST/H00081X/2); ; Science and Technology Facilities Council, STFC, (GRIDPP, ST/F006748/1, ST/F007094/1, ST/G502347/1, ST/I000410/1, ST/I002200/1, ST/I005912/1, ST/I505572/1); Science and Technology Facilities Council, STFC; Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, SNF, (123501); Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, SNF
dc.identifier.doi	10.1007/jhep09(2011)109
dc.identifier.issn	1029-8479
dc.identifier.issue	9
dc.identifier.scopus	2-s2.0-84863282065
dc.identifier.startpage	109
dc.identifier.uri	https://rdlopen.rawdatalibrary.net/r/ebyu/15900
dc.identifier.volume	2011
dc.language.iso	en
dc.relation.ispartof	Journal of High Energy Physics
dc.rights	info:eu-repo/semantics/openAccess
dc.subject	Hadron-hadron scattering
dc.title	Measurement of the underlying event activity at the LHC with √s = 7 TeV and comparison with √s = 0:9 TeV
dc.type	Article
dspace.entity.type	Publication
rdl.citation.scopus	115
rdl.oa.status	green
rdl.source.index	SCOPUS