Evidence of a J/ψKS0 Structure in B0 → J/ψϕKS0 Decays

• Published in: Physical review letters 2023-09, Vol.131 (13)
• Main Authors: Aaij, R, Abdelmotteleb, A.S.W, Abellan Beteta, C, Abudinén, F, Ackernley, T, Adeva, B, Adinolfi, M, Adlarson, P, Afsharnia, H, Agapopoulou, C, Aidala, C.A, Ajaltouni, Z, Akar, S, Akiba, K, Albicocco, P, Albrecht, J, Alessio, F, Alexander, M, Alfonso Albero, A, Aliouche, Z, Alvarez Cartelle, P, Amalric, R, Amato, S, Amey, J.L, Amhis, Y, An, L, Anderlini, L, Andersson, M, Andreianov, A, Andreotti, M, Andreou, D, Ao, D, Archilli, F, Artamonov, A, Artuso, M, Aslanides, E, Atzeni, M, Audurier, B, Bachiller Perea, I, Bachmann, S, Bachmayer, M, Back, J.J, Bailly-Reyre, A, Baladron Rodriguez, P, Balagura, V, Baldini, W, Baptista de Souza Leite, J, Barbetti, M, Barlow, R.J, Barsuk, S, Barter, W, Bartolini, M, Baryshnikov, F, Basels, J.M, Bassi, G, Batsukh, B, Battig, A, Bay, A, Beck, A, Becker, M, Bedeschi, F, Bediaga, I.B, Beiter, A, Belin, S, Bellee, V, Belous, K, Belov, I, Belyaev, I, Benane, G, Bencivenni, G, Ben-Haim, E, Berezhnoy, A, Bernet, R, Bernet Andres, S, Berninghoff, D, Bernstein, H.C, Bertella, C, Bertolin, A, Betancourt, C, Betti, F, Bezshyiko, Ia, Bhasin, S, Bhom, J, Bian, L, Bieker, M.S, Biesuz, N.V, Billoir, P, Biolchini, A, Birch, M, Bishop, F.C.R, Bitadze, A, Bizzeti, A, Blago, M.P, Blake, T, Blanc, F, Blank, J.E, Blusk, S, Bobulska, D, Boelhauve, J.A, Boente Garcia, O
• Format: Article
• Language: English
• Subjects: High Energy Physics - Experiment; Physics
• ISSN: 0031-9007; 1079-7114
• DOI: 10.1103/PhysRevLett.131.131901

An amplitude analysis of B0 → J/ψϕKS0 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 J/ψKS0 system, named Tψs1θ ( 4000 ) 0 , is seen, with its mass and width measured to be 3991-10+12 -17+9  MeV/ c 2 and 105-25+29 -23+17  MeV , respectively, where the first uncertainty is statistical and the second systematic. The Tψs1θ ( 4000 ) 0 state is likely to be the isospin partner of the Tψs1θ ( 4000 ) + state, previously observed in the J/ψK+ system of the B+ → J/ψϕK+ decay. When isospin symmetry for the charged and neutral Tψs1θ ( 4000 ) states is assumed, the signal significance increases to 5.4 standard deviations.