Using pp collision data corresponding to 1.0 fb(-1) integrated luminosity collected by the LHCb detector, two narrow states are observed in the Lambda(0)(b) pi(+) pi(-) spectrum with masses 5911.97 +/- 0.12(stat) +/- 0.02(syst) +/- 0.66(Lambda(0)(b) mass) MeV/c(2) and 5919.77 +/- 0.08(stat) +/- 0.02(syst) +/- 0.66(Lambda(0)(b) mass) MeV/c(2). The significances of the observations are 5.2 and 10.2 standard deviations, respectively. These states are interpreted as the orbitally excited Lambda(0)(b) baryons, Lambda(b)*(0)(5912) and Lambda(b)*(0)(5920). RI Galli, Domenico/A-1606-2012; Teodorescu, Eliza/K-3044-2012; Sarti, Alessio/I-2833-2012
Observation of Excited Lambda(0)(b) Baryons
Dettori F;Lai A;MANCA, GIULIA;OLDEMAN, RUDOLF GERHARD CHRISTIAAN;SAITTA, BIAGIO;
2012-01-01
Abstract
Using pp collision data corresponding to 1.0 fb(-1) integrated luminosity collected by the LHCb detector, two narrow states are observed in the Lambda(0)(b) pi(+) pi(-) spectrum with masses 5911.97 +/- 0.12(stat) +/- 0.02(syst) +/- 0.66(Lambda(0)(b) mass) MeV/c(2) and 5919.77 +/- 0.08(stat) +/- 0.02(syst) +/- 0.66(Lambda(0)(b) mass) MeV/c(2). The significances of the observations are 5.2 and 10.2 standard deviations, respectively. These states are interpreted as the orbitally excited Lambda(0)(b) baryons, Lambda(b)*(0)(5912) and Lambda(b)*(0)(5920). RI Galli, Domenico/A-1606-2012; Teodorescu, Eliza/K-3044-2012; Sarti, Alessio/I-2833-2012
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