A measurement is presented of the relative prompt production rate of chic2and chic1 with 4.6 fb−1 of data collected by the CMS experiment at the LHC in pp collisions at sqrt(s) = 7 TeV. The two states are measured via their radiative decays chic → Jpsi + gamma , with the photon converting into an e+e− pair for Jpsi rapidity |y(jpsi)| < 1.0 and photon transverse momentum pT(gamma) > 0.5 GeV/c. The measurement is given for six intervals of pT(jpsi) between 7 and 25 GeV/c. The results are compared to theoretical predictions.
Measurement of the relative prompt production rate of chi c2 and chi c1 in pp collisions at sqrt(s) = 7 TeV
V. Sola;AMAPANE, Nicola Carlo;ARGIRO', Stefano;COSTA, Marco;MIGLIORE, Ernesto;MONACO, Vincenzo;MUSICH, MARCO;OBERTINO, Maria Margherita;PELLICCIONI, Mario;ROMERO, Alessandra;SACCHI, Roberto;SOLANO, Ada Maria;BELLAN, Riccardo;COVARELLI, Roberto;
2012-01-01
Abstract
A measurement is presented of the relative prompt production rate of chic2and chic1 with 4.6 fb−1 of data collected by the CMS experiment at the LHC in pp collisions at sqrt(s) = 7 TeV. The two states are measured via their radiative decays chic → Jpsi + gamma , with the photon converting into an e+e− pair for Jpsi rapidity |y(jpsi)| < 1.0 and photon transverse momentum pT(gamma) > 0.5 GeV/c. The measurement is given for six intervals of pT(jpsi) between 7 and 25 GeV/c. The results are compared to theoretical predictions.File in questo prodotto:
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