The production of chi(b)(1P) mesons in pp collisions at a centre-of-mass energy of 7 TeV is studied using 32 pb(-1) of data collected with the LHCb detector. The chi(b)(1P) mesons are reconstructed in the decay mode chi(b)(1P) -> Gamma(1S)gamma -> mu(+)mu(-)gamma. The fraction of Gamma(1S) originating from chi(b)(1P) decays in the Gamma(1S) transverse momentum range 6 < p(T)(Gamma(1S)) < 15GeV/c and rapidity range 2.0 < y(Gamma(1S)) < 4.5 is measured to be (20.7 +/- 5.7 +/- 2.1(-5.4)(+2.7))%, where the first uncertainty is statistical, the second is systematic and the last gives the range of the result due to the unknown Gamma(1S) and chi(b)(1P) polarizations. RI Galli, Domenico/A-1606-2012; Coca, Cornelia/B-6015-2012; Sarti, Alessio/I-2833-2012
Measurement of the fraction of Gamma(1S) originating from chi(b)(1P) decays in pp collisions at root s=7 TeV
Dettori F;Lai A;MANCA, GIULIA;OLDEMAN, RUDOLF GERHARD CHRISTIAAN;SAITTA, BIAGIO;
2012-01-01
Abstract
The production of chi(b)(1P) mesons in pp collisions at a centre-of-mass energy of 7 TeV is studied using 32 pb(-1) of data collected with the LHCb detector. The chi(b)(1P) mesons are reconstructed in the decay mode chi(b)(1P) -> Gamma(1S)gamma -> mu(+)mu(-)gamma. The fraction of Gamma(1S) originating from chi(b)(1P) decays in the Gamma(1S) transverse momentum range 6 < p(T)(Gamma(1S)) < 15GeV/c and rapidity range 2.0 < y(Gamma(1S)) < 4.5 is measured to be (20.7 +/- 5.7 +/- 2.1(-5.4)(+2.7))%, where the first uncertainty is statistical, the second is systematic and the last gives the range of the result due to the unknown Gamma(1S) and chi(b)(1P) polarizations. RI Galli, Domenico/A-1606-2012; Coca, Cornelia/B-6015-2012; Sarti, Alessio/I-2833-2012
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