298 articles – 2276 Notices  [english version]
HAL : in2p3-00685081, version 1

Fiche détaillée  Récupérer au format
European Physical Journal C: Particles and Fields 72 (2012) 2216
Ratios of dijet production cross sections as a function of the absolute difference in rapidity between jets in proton-proton collisions at sqrt(s) = 7 TeV
S. Chatrchyan, D. Sillou1, M. Besancon2, S. Choudhury2, M. Dejardin2, D. Denegri2, B. Fabbro2, J.L. Faure2, F. Ferri2, S. Ganjour2, A. Givernaud2, P. Gras2, G. Hamel de Monchenault2, P. Jarry2, E. Locci2, J. Malcles2, L. Millischer2, J. Rander2, A. Rosowsky2, I. Shreyber2, M. Titov2, S. Baffioni3, F. Beaudette3, L. Benhabib3, L. Bianchini3, M. Bluj3, C. Broutin3, Pierre Busson3, C. Charlot3, N. Daci3, T. Dahms3, L. Dobrzynski3, S. Elgammal3, R. Granier de Cassagnac3, M. Haguenauer3, P. Mine3, C. Mironov3, C. Ochando3, P. Paganini3, D. Sabes3, R. Salerno3, Y. Sirois3, C. Thiebaux3, C. Veelken3, A. Zabi3, J.-L. Agram4, J. Andrea4, D. Bloch4, D. Bodin4, J.-M. Brom4, M. Cardaci4, E.C. Chabert4, C. Collard4, E. Conte4, F. Drouhin4, C. Ferro4, J.-C. Fontaine4, D. Gele4, U. Goerlach4, P. Juillot4, M. Karim4, A.-C. Le Bihan4, P. Van Hove4, F. Fassi5, D. Mercier5, C. Baty6, S. Beauceron6, N. Beaupere6, M. Bedjidian6, O. Bondu6, G. Boudoul6, D. Boumediene6, H. Brun6, J. Chasserat6, R. Chierici6, D. Contardo6, P. Depasse6, H. El Mamouni6, A. Falkiewicz6, J. Fay6, S. Gascon6, M. Gouzevitch6, B. Ille6, T. Kurca6, T. Le Grand6, M. Lethuillier6, L. Mirabito6, S. Perries6, V. Sordini6, S. Tosi6, Y. Tschudi6, P. Verdier6, S. Viret6
CMS Collaboration(s)
(2012)

A study of dijet production in proton-proton collisions was performed at sqrt(s) = 7 TeV for jets with pt > 35 GeV and abs(y) < 4.7 using data collected with the CMS detector at the LHC in 2010. Events with at least one pair of jets are denoted as "inclusive". Events with exactly one pair of jets are called "exclusive". The ratio of the cross section of all pairwise combinations of jets to the exclusive dijet cross section as a function of the rapidity difference between jets abs(Delta(y)) is measured for the first time up to abs(Delta(y)) = 9.2. The ratio of the cross section for the pair consisting of the most forward and the most backward jet from the inclusive sample to the exclusive dijet cross section is also presented. The predictions of the Monte Carlo event generators PYTHIA6 and PYTHIA8 agree with the measurements. In both ratios the HERWIG++ generator exhibits a more pronounced rise versus abs(Delta(y)) than observed in the data. The BFKL-motivated generators CASCADE and HEJ+ARIADNE predict for these ratios a significantly stronger rise than observed.
1 :  LAPP - Laboratoire d'Annecy le Vieux de Physique des Particules
2 :  IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA)
3 :  LLR - Laboratoire Leprince-Ringuet
4 :  DRS-IPHC - Département Recherches Subatomiques
5 :  CC IN2P3 - Centre de Calcul de l'inst. national de phy. nucléaire et de phy. des particules
6 :  IPNL - Institut de Physique Nucléaire de Lyon
CMS
Physique/Physique des Hautes Energies - Expérience
Lien vers le texte intégral : 
http://fr.arXiv.org/abs/1204.0696