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Study of the ψ 2(3823) and χ c1(3872) states in B+ → (J/ψπ + π −)K+ decays

LHCb Collaboration ; Alfonso Albero, Alejandro ; Calvo Gómez, Míriam ; Camboni, Alessandro ; Coquereau, Samuel ; García Moreno, P ; Garrido Beltrán, Lluís ; Gascón Fora, David ; Gironella Gironell, Pere ; Golobardes, Elisabet ; Graciani Díaz, Ricardo ; Graugés Pous, Eugeni ; Manera, Rafel ; Marin Benito, Carla ; Vilasis-Cardona, Xavier

Springer Verlag 2020-08

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  • Título:
    Study of the ψ 2(3823) and χ c1(3872) states in B+ → (J/ψπ + π −)K+ decays
  • Autor: LHCb Collaboration ; Alfonso Albero, Alejandro ; Calvo Gómez, Míriam ; Camboni, Alessandro ; Coquereau, Samuel ; García Moreno, P ; Garrido Beltrán, Lluís ; Gascón Fora, David ; Gironella Gironell, Pere ; Golobardes, Elisabet ; Graciani Díaz, Ricardo ; Graugés Pous, Eugeni ; Manera, Rafel ; Marin Benito, Carla ; Vilasis-Cardona, Xavier
  • Assuntos: Experiments ; Física de partícules ; Gran Col·lisionador d'Hadrons ; Hadrons ; Large Hadron Collider (France and Switzerland) ; Particle physics
  • Notas: Articles publicats en revistes (Física Quàntica i Astrofísica)
    1126-6708
    Journal of High Energy Physics, 2020, num. 123
    Reproducció del document publicat a: https://doi.org/10.1007/JHEP08(2020)123
    http://hdl.handle.net/2445/185288
    https://doi.org/10.1007/JHEP08(2020)123
    710235
    info:eu-repo/grantAgreement/EC/H2020/792684/EU//pANUCSTR
  • Descrição: The decays B+ → J/ψπ+π−K+ are studied using a data set corresponding to an integrated luminosity of 9 fb−1 collected with the LHCb detector in proton-proton collisions between 2011 and 2018. Precise measurements of the ratios of branching fractions with the intermediate ψ2(3823), χc1(3872) and ψ(2S) states are reported. The values are BB+→ψ2(3823)K+×Bψ2(3823)→J/ψπ+π−BB+→χc1(3872)K+×Bχc1(3872)→J/ψπ+π−=(3.56±0.67±0.11)×10−2,BB+→ψ2(3823)K+×Bψ2(3823)→J/ψπ+π−BB+→ψ(2S)K+×Bψ(2S)→J/ψπ+π−=(1.31±0.25±0.04)×10−3,BB+→χc1(3872)K+×Bχc1(3872)→J/ψπ+π−BB+→ψ(2S)K+×Bψ(2S)→J/ψπ+π−=(3.69±0.07±0.06)×10−2, where the first uncertainty is statistical and the second is systematic. The decay of B+ → ψ2(3823)K+ with ψ2(3823) → J/ψπ+π− is observed for the first time with a significance of 5.1 standard deviations. The mass differences between the ψ2(3823), χc1(3872) and ψ(2S) states are measured to be mχc1(3872)−mψ2(3823)=47.50±0.53±0.13MeV/c2,mψ2(3823)−mψ2(2S)=137.98±0.53±0.14MeV/c2,mχc1(3872)−mψ2(2S)=185.49±0.06±0.03MeV/c2, resulting in the most precise determination of the χc1(3872) mass. The width of the ψ2(3823) state is found to be below 5.2 MeV at 90% confidence level. The Breit-Wigner width of the χc1(3872) state is measured to be ΓBWχc1(3872)=0.96+0.19−0.18±0.21MeV which is inconsistent with zero by 5.5 standard deviations.
  • Editor: Springer Verlag
  • Data de criação/publicação: 2020-08
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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