Evidence for the decay X(3872) -> psi(2S)gamma

Evidence for the decay mode X(3872) → ψ(2S)γ in B + → X(3872)K+ decays is found with a significance of 4.4 standard deviations. The analysis is based on a data sample of proton-proton collisions, corresponding to an integrated luminosity of 3 fb−1 , collected with the LHCb detector, at centre-of-mas...

Full description

Bibliographic Details
Authors: Camboni, Alessandro, Comerma Montells, Albert, Garrido Beltrán, Lluís, Graciani Díaz, Ricardo, Graugés Pous, Eugeni, Marin Benito, Carla, Picatoste Olloqui, Eduardo, Potterat, Cédric, Rives Molina, Vicente José, Ruiz, Hugo (Ruiz Pérez), LHCb Collaboration
Format: article
Status:Published version
Publication Date:2014
Country:España
Institution:Universidad de Barcelona
Repository:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/185641
Online Access:https://hdl.handle.net/2445/185641
Access Level:Open access
Keyword:Hadrons
Gran Col·lisionador d'Hadrons
Física de partícules
Experiments
Large Hadron Collider (France and Switzerland)
Particle physics
Description
Summary:Evidence for the decay mode X(3872) → ψ(2S)γ in B + → X(3872)K+ decays is found with a significance of 4.4 standard deviations. The analysis is based on a data sample of proton-proton collisions, corresponding to an integrated luminosity of 3 fb−1 , collected with the LHCb detector, at centre-of-mass energies of 7 and 8 TeV. The ratio of the branching fraction of the X(3872) → ψ(2S)γ decay to that of the X(3872) → J/ψγ decay is measured to be B(X(3872) → ψ(2S)γ) B(X(3872) → J/ψγ) = 2.46 ± 0.64 ± 0.29, where the first uncertainty is statistical and the second is systematic. The measured value agrees with expectations for a pure charmonium interpretation of the X(3872) state and a mixture of charmonium and molecular interpretations. However, it does not support a pure DD¯ ∗ molecular interpretation of the X(3872) state.

Similar Items