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Study of the underlying event at forward rapidity in pp collisions at vs = 0.9, 2.76, and 7 TeV

Abstract: The underlying event activity in proton-proton collisions at forward pseudorapidity (?6.6 < ? < ?5.2) is studied with the CMS detector at the LHC, using a novel observable: the ratio of the forward energy density, dE/d?, for events with a chargedparticle jet produced at central pseudorapidity (|?jet| < 2) to the forward energy density for inclusive events. This forward energy density ratio is measured as a function of the central jet transverse momentum, pT, at three different pp centre-of-mass energies (?s = 0.9,2.76, and 7 TeV). In addition, the ?s evolution of the forward energy density is studied in inclusive events and in events with a central jet. The results are compared to those of Monte Carlo event generators for pp collisions and are discussed in terms of the underlying event. Whereas the dependence of the forward energy density ratio on jet pT at each ?s separately can be well reproduced by some models, all models fail to simultaneously describe the increase of the forward energy density with ?s in both inclusive events and in events with a central jet.

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 Autoría: Chatrchyan S., Khachatryan V., Sirunyan A.M., Tumasyan A., Adam W., Aguilo E., Bergauer T., Dragicevic M., Erö J., Fabjan C., Friedl M., Frühwirth R., Ghete V.M., Hörmann N., Hrubec J., Jeitler M., Kiesenhofer W., Knünz V., Krammer M., Krätschmer I., Liko D., Mikulec I., Pernicka M., Rabady D., Rahbaran B., Rohringer C., Rohringer H., Schöfbeck R., Strauss J., Taurok A., Waltenberger W., Wulz C.E., Mossolov V., Shumeiko N., Suar

 Fuente: Journal of High Energy Physics (2013) Volume 2013, issue 4, Article number: 72

Editorial: Springer Verlag

 Fecha de publicación: 11/04/2013

Nº de páginas: 36

Tipo de publicación: Artículo de Revista

 DOI: 10.1007/JHEP04(2013)072

ISSN: 1126-6708,1029-8479

Url de la publicación: https://doi.org/10.1007/JHEP04(2013)072