Observation of the decay B¯¯¯0s→ψ(2S)K+π−

R. Aaij; Y. Amhis; S. Barsuk; M. Borsato; O. Kochebina; J. Lefrançois; Y. Li; F. Machefert; R. Quagliani; P. Robbe; M.-H. Schune; M. Teklishyn; A. Vallier; B. Viaud; G. Wormser; Ziad Ajaltouni; M. Baalouch; E. Cogneras; O. Deschamps; I. El Rifai; G. Gazzoni; M. Grabalosa Gándara; Pierre Henrard; M. Hoballah; R. Lefèvre; J. Maratas; S. Monteil; V. Niess; P. Perret; Akar S.; Aslanides E.; Cogan J.; Kanso W.; Legac R.; O. Leroy; Mancinelli G.; Mordà A.; Serrano J.; Tsaregorodtsev A.; L. Beaucourt; M. Chefdeville; D. Decamp; N. Déléage; Ph. Ghez; J.-P. Lees; J.F. Marchand; M.-N. Minard; B. Pietrzyk; W. Qian; S. t'Jampens; V. Tisserand; E. Tournefier

doi:10.1016/j.physletb.2015.06.038

Journal articles

Observation of the decay B¯¯¯0s→ψ(2S)K+π−

R. Aaij Y. Amhis ¹ S. Barsuk ¹ M. Borsato ¹ O. Kochebina ¹ J. Lefrançois ¹ Y. Li ¹ F. Machefert ¹ R. Quagliani ¹ P. Robbe ¹ M.-H. Schune ¹ M. Teklishyn ¹ A. Vallier ¹ B. Viaud ¹ G. Wormser ¹ Ziad Ajaltouni ² M. Baalouch ² E. Cogneras ² O. Deschamps ² I. El Rifai ² G. Gazzoni ² M. Grabalosa Gándara ² Pierre Henrard ² M. Hoballah ² R. Lefèvre ² J. Maratas ² S. Monteil ² V. Niess ² P. Perret ² Akar S. ³ Aslanides E. ³ Cogan J. ³ Kanso W. ³ Legac R. ³ O. Leroy ³ Mancinelli G. ³ Mordà A. ³ Serrano J. ³ Tsaregorodtsev A. ³ L. Beaucourt ⁴ M. Chefdeville ⁴ D. Decamp ⁴ N. Déléage ⁴ Ph. Ghez ⁴ J.-P. Lees ⁴ J.F. Marchand ⁴ M.-N. Minard ⁴ B. Pietrzyk ⁴ W. Qian ⁴ S. t'Jampens ⁴ V. Tisserand ⁴ E. Tournefier ⁴

1 LAL - Laboratoire de l'Accélérateur Linéaire

2 LPC - Laboratoire de Physique Corpusculaire - Clermont-Ferrand

3 CPPM - Centre de Physique des Particules de Marseille

4 LAPP - Laboratoire d'Annecy de Physique des Particules

Abstract : The decay B¯¯¯0s→ψ(2S)K+π− is observed using a data set corresponding to an integrated luminosity of 3.0fb−1 collected by the LHCb experiment in pp collisions at centre-of-mass energies of 7 and 8 TeV. The branching fraction relative to the B0→ψ(2S)K+π− decay mode is measured to be B(B¯¯¯0s→ψ(2S)K+π−)B(B0→ψ(2S)K+π−)=5.38±0.36(stat)±0.22(syst)±0.31(fs/fd)%, where fs/fd indicates the uncertainty due to the ratio of probabilities for a b quark to hadronise into a B0s or B0 meson. Using an amplitude analysis, the fraction of decays proceeding via an intermediate K∗(892)0 meson is measured to be 0.645±0.049(stat)±0.049(syst) and its longitudinal polarisation fraction is 0.524±0.056(stat)±0.029(syst). The relative branching fraction for this component is determined to be B(B¯¯¯0s→ψ(2S)K∗(892)0)B(B0→ψ(2S)K∗(892)0)=5.58±0.57(stat)±0.40(syst)±0.32(fs/fd)%. In addition, the mass splitting between the B0s and B0 mesons is measured as M(B0s)−M(B0)=87.45±0.44(stat)±0.07(syst)MeV/c2.

Document type :

Journal articles

Domain :

Physics [physics] / High Energy Physics - Experiment [hep-ex]

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Contributor : Sabine Starita <>
Submitted on : Wednesday, March 25, 2015 - 5:25:25 PM
Last modification on : Wednesday, September 16, 2020 - 4:28:23 PM

Observation of the decay B¯¯¯0s→ψ(2S)K+π−

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Observation of the decay B¯¯¯0s→ψ(2S)K+π−

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