The chi(b1)(3P) and chi(b2)(3P) states are observed through their gamma(3S)(gamma) decays, using an event sample of proton-proton collisions collected by the CMS experiment at the CERN LHC. The data were collected at a center-of-mass energy of 13 TeV and correspond to an integrated luminosity of 80.0 fb(-1). The gamma(3S) mesons are identified through their dimuon decay channel, while the low-energy photons are detected after converting to e(+)e(-) pairs in the silicon tracker, leading to a chi(b)(3P) mass resolution of 2.2 MeV. This is the first time that the J = 1 and 2 states are well resolved and their masses individually measured: 10513.42 +/- 0.41(stat) +/- 0.18(syst) MeV and 10524.02 +/- 0.57(stat) +/- 0.18(syst) MeV; they are determined with respect to the world-average value of gamma(3S) mass, which has an uncertainty of 0.5 MeV. The mass splitting is measured to be 10.60 +/- 0.64(stat) +/- 0.17(syst) MeV.

Observation of the χb1(3P) and χb2(3P) and Measurement of their Masses / Sirunyan, A.M., Tumasyan, A., Adam, W., Ambrogi, F., Asilar, E., Bergauer, T., Brandstetter, J., Dragicevic, M., Eroe, J., Del Valle, A.E., Flechl, M., Fruehwirth, R., Ghete, V.M., Hrubec, J., Jeitler, M., Krammer, N., Kraetschmer, I., Liko, D., Madlener, T., Mikulec, I., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 121:9(2018). [10.1103/PhysRevLett.121.092002]

Observation of the χb1(3P) and χb2(3P) and Measurement of their Masses

Creanza, D.;De Filippis, N.;Di Florio, A.;Iaselli, G.;Maggi, G.;Pugliese, G.;
2018

Abstract

The chi(b1)(3P) and chi(b2)(3P) states are observed through their gamma(3S)(gamma) decays, using an event sample of proton-proton collisions collected by the CMS experiment at the CERN LHC. The data were collected at a center-of-mass energy of 13 TeV and correspond to an integrated luminosity of 80.0 fb(-1). The gamma(3S) mesons are identified through their dimuon decay channel, while the low-energy photons are detected after converting to e(+)e(-) pairs in the silicon tracker, leading to a chi(b)(3P) mass resolution of 2.2 MeV. This is the first time that the J = 1 and 2 states are well resolved and their masses individually measured: 10513.42 +/- 0.41(stat) +/- 0.18(syst) MeV and 10524.02 +/- 0.57(stat) +/- 0.18(syst) MeV; they are determined with respect to the world-average value of gamma(3S) mass, which has an uncertainty of 0.5 MeV. The mass splitting is measured to be 10.60 +/- 0.64(stat) +/- 0.17(syst) MeV.
2018
Observation of the χb1(3P) and χb2(3P) and Measurement of their Masses / Sirunyan, A.M., Tumasyan, A., Adam, W., Ambrogi, F., Asilar, E., Bergauer, T., Brandstetter, J., Dragicevic, M., Eroe, J., Del Valle, A.E., Flechl, M., Fruehwirth, R., Ghete, V.M., Hrubec, J., Jeitler, M., Krammer, N., Kraetschmer, I., Liko, D., Madlener, T., Mikulec, I., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 121:9(2018). [10.1103/PhysRevLett.121.092002]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/138450
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