Artículos de revistas
Search for Quark Compositeness with the Dijet Centrality Ratio in pp Collisions at root s=7 TeV
Fecha
2010-12-20Registro en:
Physical Review Letters. College Pk: Amer Physical Soc, v. 105, n. 26, p. 15, 2010.
0031-9007
10.1103/PhysRevLett.105.262001
WOS:000286754700004
WOS000286754700004.pdf
Autor
Yerevan Phys Inst
OeAW
Natl Ctr Particle & High Energy Phys
Univ Antwerp
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Institución
Resumen
A search for quark compositeness in the form of quark contact interactions, based on hadronic jet pairs (dijets) produced in proton-proton collisions at root s = 7 eV, is described. The data sample of the study corresponds to an integrated luminosity of 2.9 pb(-1) 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% confidence level.