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“School of Particles”

Paper IPM / Particles / 11563

School of Particles and Accelerator

Title:

Search for Quark Compositeness with the Dijet Centrality Ratio in pp Collisions at sqrt(s)=7 TeV

Author(s):

1 .	Hessamaddin Arfaei
2 .	Hamed Bakhshiansohi
3 .	Seyed Mohsen Etesami
4 .	Ali Fahim
5 .	Majid Hashemi
6 .	Abideh Jafari
7 .	Mohsen Khakzad
8 .	A Mohammadi
9 .	Mojtaba Mohammadi Najafabadi
10 .	Saeid Paktinat Mehdiabadi
11 .	Batool Safarzadeh
12 .	Maryam Zeinali

Status:

Published

Journal:

Phys. Rev. Lett.

No.:

262001

Vol.:

105

Year:

2010

Pages:

Supported by:

IPM

Abstract:

A search for quark compositeness in the form of quark contact interactions, based on hadronic jet pairs (dijets) produced in proton-proton collisions at sqrt(s)=7 TeV, is described. The data sample of the study corresponds to an integrated luminosity of 2.9 inverse picobarns collected with the CMS detector at the LHC. The dijet centrality ratio, which quantifies the angular distribution of the dijets, is measured as a function of the invariant mass of the dijet system and is found to agree with the predictions of the Standard Model. A statistical analysis of the data provides a lower limit on the energy scale of quark contact interactions. The sensitivity of the analysis is such that the expected limit is 2.9 TeV; because the observed value of the centrality ratio at high invariant mass is below the expectation, the observed limit is 4.0 TeV at the 95

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