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.
|Titolo:||Search for Quark Compositeness with the Dijet Centrality Ratio in pp Collisions at root s=7 TeV|
|Data di pubblicazione:||2010|
|Citazione:||Search for Quark Compositeness with the Dijet Centrality Ratio in pp Collisions at root s=7 TeV / V. KHACHATRYAN; CMS COLLABORATION; INCLUDING; ALBERGO S.; CAPPELLO G; CHIORBOLI M; COSTA S; TRICOMI A; TUVE C. - 105:26(2010), pp. 262001-1-262001-15.|
|Appare nelle tipologie:||1.1 Articolo in rivista|