# name
Evidence of a J/ψ KS0 Structure in B0 →j/ψφ KS0 Decays

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An amplitude analysis of   0→  /  ⁢  ⁢  0S decays is performed using proton-proton collision data, corresponding to an integrated luminosity of 9  fb−1, collected with the LHCb detector at center-of-mass energies of 7, 8, and 13 TeV. Evidence with a significance of 4.0 standard deviations of a structure in the   /  ⁢  0S system, named       ⁢  ⁢1⁢(4000)0, is seen, with its mass and width measured to be 3991+12−10⁢ +9−17  MeV/⁢c2 and 105+29−25⁢ +17−23  MeV, respectively, where the first uncertainty is statistical and the second systematic. The       ⁢  ⁢1⁢(4000)0 state is likely to be the isospin partner of the       ⁢  ⁢1⁢(4000)+ state, previously observed in the   /  ⁢  + system of the   +→  /  ⁢  ⁢  + decay. When isospin symmetry for the charged and neutral       ⁢  ⁢1⁡(4000) states is assumed, the signal significance increases to 5.4 standard deviations.

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Physical Review Letters, 2023, vol. 131, num.131901

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Articles publicats en revistes (Física Quàntica i Astrofísica)

# metadata.dc.title[].value
Evidence of a J/ψ KS0 Structure in B0 →j/ψφ KS0 Decays