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Physics Letters B 721 (2013) 212-219
Measurement of the combined rapidity and $p_T$ dependence of dijet azimuthal decorrelations in $p\bar{p}$ collisions at $\sqrt{s}=1.96\,$TeV
V.M. Abazov, U. Bassler1, G. Bernardi2, M. Besançon1, D. Brown2, J. Brown2, E. Chapon1, F. Couderc1, F. Deliot1, Y. Enari2, S. Greder3, G. Grenier4, A. Grohsjean1, Z. Hubacek1, T. Kurca4, P. Lebrun4, J. Lellouch2, F. Miconi3, C. Royon1, V. Shary1, M. Titov1, P. Verdier4, D. Vilanova1, F. Badaud5, Ph. Gris5, J.-F. Grivaz6, T. Guillemin6, M. Jaffré6, P. Pétroff6, M.-C. Cousinou7, A. Duperrin7, W. Geng7, E. Kajfasz7, S. Kermiche7, E. Nagy7, N. Osman7, G. Sajot8, J. Stark8
For the D0 collaboration(s)

We present the first combined measurement of the rapidity and transverse momentum dependence of dijet azimuthal decorrelations, based on the recently proposed quantity $R_{\Delta \phi}$. The variable $R_{\Delta \phi}$ measures the fraction of the inclusive dijet events in which the azimuthal separation of the two jets with the highest transverse momenta is less than a specified value for the parameter $\Delta \phi_{\rm max}$. The quantity $R_{\Delta \phi}$ is measured in $p\bar{p}$ collisions at $\sqrt{s}=1.96\,$TeV, as a function of the dijet rapidity interval, the total scalar transverse momentum, and $\Delta \phi_{\rm max}$. The measurement uses an event sample corresponding to an integrated luminosity of $0.7\,$fb$^{-1}$ collected with the D0 detector at the Fermilab Tevatron Collider. The results are compared to predictions of a perturbative QCD calculation at next-to-leading order in the strong coupling with corrections for non-perturbative effects. The theory predictions describe the data, except in the kinematic region of large dijet rapidity intervals and large $\Delta \phi_{\rm max}$.
1:  IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA)
2:  LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
3:  IPHC - Institut Pluridisciplinaire Hubert Curien
4:  IPNL - Institut de Physique Nucléaire de Lyon
5:  LPC - Laboratoire de Physique Corpusculaire [Clermont-Ferrand]
6:  LAL - Laboratoire de l'Accélérateur Linéaire
7:  CPPM - Centre de Physique des Particules de Marseille
8:  LPSC - Laboratoire de Physique Subatomique et de Cosmologie
Physics/High Energy Physics - Experiment
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