An amplitude analysis of B0 -> JPsiPhiK0S 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 KPsiK0S system, named T\^theta(4000)^0, is seen, with its mass and width measured to be 399+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 T\^theta(4000)^0 state is likely to be the isospin partner of the T\^theta(4000)^+ state, previously observed in the JPsiK+ system of the B+ -> J/PsiPhiK+ decay. When isospin symmetry for the charged and neutral T\^theta(4000) states is assumed, the signal significance increases to 5.4 standard deviations.
Evidence of a J/PsiK0S Structure in B0 -> KPsiPhiK0S Decays
Bassi, G.Membro del Collaboration Group
;Kleijne, N.Membro del Collaboration Group
;Lusiani, A.Membro del Collaboration Group
;MORELLO, MICHAEL JOSEPHMembro del Collaboration Group
;Pica, L.Membro del Collaboration Group
;Ribatti, R.Membro del Collaboration Group
;
2023
Abstract
An amplitude analysis of B0 -> JPsiPhiK0S 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 KPsiK0S system, named T\^theta(4000)^0, is seen, with its mass and width measured to be 399+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 T\^theta(4000)^0 state is likely to be the isospin partner of the T\^theta(4000)^+ state, previously observed in the JPsiK+ system of the B+ -> J/PsiPhiK+ decay. When isospin symmetry for the charged and neutral T\^theta(4000) states is assumed, the signal significance increases to 5.4 standard deviations.File | Dimensione | Formato | |
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PhysRevLett.131.131901-min.pdf
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