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Measurement of angular correlations of jets at sqrt(s)=1.96 TeV and determination of the strong coupling at high momentum transfers
Abazov V.M., Bassler U., Bernardi G., Besançon M., Brown D. et al
Physics Letters B 718 (2012) 56-63 - http://hal.in2p3.fr/in2p3-00719929
Physique/Physique des Hautes Energies - Expérience
Physique/Physique des Hautes Energies - Phénoménologie
Measurement of angular correlations of jets at sqrt(s)=1.96 TeV and determination of the strong coupling at high momentum transfers
V.M. Abazov, U. Bassler1, G. Bernardi2, M. Besançon1, D. Brown2, J. Brown2, E. Chapon1, S. Chevalier-Thery1, F. Couderc1, A. Croc1, F. Deliot1, C. Deterre1, Y. Enari2, S. Greder3, G. Grenier4, A. Grohsjean1, Z. Hubacek1, T. Kurca4, P. Lebrun4, J. Lellouch2, R. Madar1, F. Miconi3, I. Ripp-Baudot3, C. Royon1, V. Shary1, M. Titov1, B. Tuchming1, P. Verdier4, D. Vilanova1, F. Badaud5, P. Gay5, Ph. Gris5, J.-F. Grivaz6, T. Guillemin6, M. Jaffré6, P. Pétroff6, H. Li7, G. Sajot7, J. Stark7, M. -C. Cousinou8, A. Duperrin8, W. Geng8, E. Kajfasz8, S. Kermiche8, E. Nagy8, N. Osman8
1 :  IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA)
2 :  LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
CNRS : UMR7585 – IN2P3 – Université Pierre et Marie Curie (UPMC) - Paris VI – Université Paris VII - Paris Diderot
Barre 12-22, 1er étage 4 Place Jussieu 75252 Paris Cedex 05
3 :  IPHC - Institut Pluridisciplinaire Hubert Curien
CNRS : UMR7178 – Université de Strasbourg
4 :  IPNL - Institut de Physique Nucléaire de Lyon
CNRS : UMR5822 – IN2P3 – Université Claude Bernard - Lyon I (UCBL)
5 :  LPC - Laboratoire de Physique Corpusculaire [Clermont-Ferrand]
CNRS : UMR6533 – IN2P3 – Université Blaise Pascal - Clermont-Ferrand II
Campus des Cézeaux 24, avenue des Landais BP 80026 63171 Aubière Cedex
6 :  LAL - Laboratoire de l'Accélérateur Linéaire
CNRS : UMR8607 – IN2P3 – Université Paris XI - Paris Sud
Centre Scientifique d'Orsay B.P. 34 91898 ORSAY Cedex
7 :  LPSC - Laboratoire de Physique Subatomique et de Cosmologie
CNRS : UMR5821 – IN2P3 – Université Joseph Fourier - Grenoble I – Institut Polytechnique de Grenoble - Grenoble Institute of Technology
53 avenue des Martyrs - 38026 Grenoble Cedex
8 :  CPPM - Centre de Physique des Particules de Marseille
CNRS : UMR7346 – IN2P3 – Université de la Méditerranée - Aix-Marseille II
163, avenue de Luminy - Case 902 - 13288 Marseille cedex 09
We present a measurement of the average value of a new observable at hadron colliders that is sensitive to QCD dynamics and to the strong coupling constant, while being only weakly sensitive to parton distribution functions. The observable measures the angular correlations of jets and is defined as the number of neighboring jets above a given transverse momentum threshold which accompany a given jet within a given distance Delta-R in the plane of rapidity and azimuthal angle. The ensemble average over all jets in an inclusive jet sample is measured and the results are presented as a function of transverse momentum of the inclusive jets, in different regions of Delta-R and for different transverse momentum requirements for the neighboring jets. The measurement is based on a data set corresponding to an integrated luminosity of 0.7 fb-1 collected with the D0 detector at the Fermilab Tevatron Collider in pp-bar collisions at sqrt(s)=1.96 The results are well described by a perturbative QCD calculation in next-to-leading order in the strong coupling constant, corrected for non-perturbative effects. From these results, we extract the strong coupling and test the QCD predictions for its running over a range of momentum transfers of 50-400 GeV.

Articles dans des revues avec comité de lecture
Physics Letters B (Phys. Lett. B)
Publisher Elsevier
ISSN 0370-2693 

FERMILAB-PUB-12-397-E , LPSC12206
10 pages, 3 figures, 3 tables, submitted to Phys. Lett. B ; see paper for full list of authors
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