Elsevier

Physics Letters B

Volume 694, Issues 4–5, 3 January 2011, Pages 327-345
Physics Letters B

Search for quark contact interactions in dijet angular distributions in pp collisions at s=7 TeV measured with the ATLAS detector

https://doi.org/10.1016/j.physletb.2010.10.021Get rights and content
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open access

Abstract

Dijet angular distributions from the first LHC pp collisions at center-of-mass energy s=7TeV have been measured with the ATLAS detector. The dataset used for this analysis represents an integrated luminosity of 3.1pb1. Dijet χ distributions and centrality ratios have been measured up to dijet masses of 2.8 TeV, and found to be in good agreement with Standard Model predictions. Analysis of the χ distributions excludes quark contact interactions with a compositeness scale Λ below 3.4 TeV, at 95% confidence level, significantly exceeding previous limits.

Keywords

ATLAS
LHC
7 TeV
Dijets angular distributions
Quark compositeness
Contact interactions

Cited by (0)

© CERN, for the benefit of the ATLAS Collaboration.

E-mail address: [email protected].

a

Also at LIP, Portugal.

b

Present address: FermiLab, United States.

c

Also at Faculdade de Ciencias, Universidade de Lisboa, Portugal.

d

Also at CPPM, Marseille, France.

e

Also at TRIUMF, Vancouver, Canada.

f

Also at FPACS, AGH-UST, Cracow, Poland.

g

Now at Università dell'Insubria, Dipartimento di Fisica e Matematica.

h

Also at TRIUMF, Vancouver, Canada.

i

Also at Department of Physics, University of Coimbra, Portugal.

j

Now at CERN.

k

Also at Università di Napoli Parthenope, Napoli, Italy.

l

Also at Institute of Particle Physics (IPP), Canada.

m

Also at Università di Napoli Parthenope, via A. Acton 38, IT-80133 Napoli, Italy.

n

Louisiana Tech University, 305 Wisteria Street, P.O. Box 3178, Ruston, LA 71272, United States.

o

Also at Universidade de Lisboa, Portugal.

p

At California State University, Fresno, United States.

q

Also at TRIUMF, 4004 Wesbrook Mall, Vancouver, B.C. V6T 2A3, Canada.

r

Currently at Istituto Universitario di Studi Superiori IUSS, Pavia, Italy.

s

Also at Faculdade de Ciencias, Universidade de Lisboa, Portugal and at Centro de Fisica Nuclear da Universidade de Lisboa, Portugal.

t

Also at FPACS, AGH-UST, Cracow, Poland.

u

Also at California Institute of Technology, Pasadena, United States.

v

Louisiana Tech University, Ruston, United States.

w

Also at University of Montreal, Montreal, Canada.

x

Also at Institut für Experimentalphysik, Universität Hamburg, Hamburg, Germany.

y

Now at Chonnam National University, Chonnam 500-757, Republic of Korea.

z

Also at Petersburg Nuclear Physics Institute, Gatchina, Russia.

aa

Also at Institut für Experimentalphysik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany.

ab

Also at School of Physics and Engineering, Sun Yat-sen University, China.

ac

Also at School of Physics, Shandong University, Jinan, China.

ad

Also at California Institute of Technology, Pasadena, United States.

ae

Also at Rutherford Appleton Laboratory, Didcot, UK.

af

Also at school of physics, Shandong University, Jinan.

ag

Also at Rutherford Appleton Laboratory, Didcot, UK.

ah

Now at KEK.

ai

Also at Departamento de Fisica, Universidade de Minho, Portugal.

aj

University of South Carolina, Columbia, United States.

ak

Also at KFKI Research Institute for Particle and Nuclear Physics, Budapest, Hungary.

al

University of South Carolina, Dept. of Physics and Astronomy, 700 S. Main St, Columbia, SC 29208, United States.

am

Also at Institute of Physics, Jagiellonian University, Cracow, Poland.

an

Louisiana Tech University, Ruston, United States.

ao

Also at Centro de Fisica Nuclear da Universidade de Lisboa, Portugal.

ap

Also at School of Physics and Engineering, Sun Yat-sen University, Taiwan.

aq

University of South Carolina, Columbia, United States.

ar

Transfer to LHCb 31.01.2010.

as

Also at Oxford University, Department of Physics, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, United Kingdom.

at

Also at School of Physics and Engineering, Sun Yat-sen University.

au

Also at CEA.

av

Also at LPNHE, Paris, France.

aw

Also at Nanjing University, China.

ax

Deceased.