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2020-08-25

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cc-by (c) LHCb Collaboration (UB: Garrido, L. et al., 2020
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/185288

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

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https://doi.org/10.1007/JHEP08(2020)123

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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.

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Hadrons, Gran Col·lisionador d'Hadrons, Física de partícules, Experiments

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Hadrons, Large Hadron Collider (France and Switzerland), Particle physics, Experiments

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Articles publicats en revistes (Física Quàntica i Astrofísica)
<b>Publicacions de projectes de recerca finançats per la UE</b>

Citació

LHCb Collaboration, ALFONSO ALBERO, Alejandro, CALVO GÓMEZ, Míriam, CAMBONI, Alessandro, COQUEREAU, Samuel, GARCÍA MORENO, Paula, GARRIDO BELTRÁN, Lluís, GASCÓN FORA, David, GIRONELLA GIRONELL, Pere, GOLOBARDES, Elisabet, GRACIANI DÍAZ, Ricardo, GRAUGÉS POUS, Eugeni, MANERA ESCALERO, Rafel, MARIN BENITO, Carla, VILASIS-CARDONA, Xavier. Study of the ψ 2(3823) and χ c1(3872) states in B+ → (J/ψπ + π −)K+ decays. _Journal of High Energy Physics_. 2020. Vol. 123. [consulta: 20 de gener de 2026]. ISSN: 1126-6708. [Disponible a: https://hdl.handle.net/2445/185288]

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