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An amplitude analysis of the B thorn & RARR; D thorn s D-s K thorn decay is carried out to study for the first time its intermediate resonant contributions, using proton-proton collision data collected with the LHCb detector at center-of-mass energies of 7, 8, and 13 TeV. A near-threshold peaking structure, referred to as X(3960), is observed in the D thorn s D-s invariant-mass spectrum with significance greater than 12 standard deviations. The mass, width, and the quantum numbers of the structure are measured to be 3956 1 5 1 10 MeV, 43 1 13 1 8 MeV, and JPC = 0 thorn thorn , respectively, where the first uncertainties are statistical and the second systematic. The properties of the new structure are consistent with recent theoretical predictions for a state composed of cc over bar ss over bar quarks. Evidence for an additional structure is found around 4140 MeV in the D thorn s D-s invariant mass, which might be caused either by a new resonance with the 0 thorn thorn assignment or by a J=& psi;& phi; & LRARR; D thorn s D-s coupled-channel effect.
Observation of a Resonant Structure near the D_{s}^{+}D_{s}^{-} Threshold in the B^{+}→D_{s}^{+}D_{s}^{-}K^{+} Decay
Aaij, R;Abdelmotteleb, A S W;Abellan Beteta, C;Abudinén, F;Ackernley, T;Adeva, B;Adinolfi, M;Afsharnia, H;Agapopoulou, C;Aidala, C A;Aiola, S;Ajaltouni, Z;Akar, S;Akiba, K;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;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;Belavin, V;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;Bifani, S;Billoir, P;Biolchini, A;Birch, M;Bishop, F C R;Bitadze, A;Bizzeti, A;Blago, M P;Blake, T;Blanc, F;Blusk, S;Bobulska, D;Boelhauve, J A;Boente Garcia, O;Boettcher, T;Boldyrev, A;Bolognani, C S;Bolzonella, R;Bondar, N;Borgato, F;Borghi, S;Borsato, M;Borsuk, J T;Bouchiba, S A;Bowcock, T J V;Boyer, A;Bozzi, C;Bradley, M J;Braun, S;Brea Rodriguez, A;Brodzicka, J;Brossa Gonzalo, A;Brown, J;Brundu, D;Buonaura, A;Buonincontri, L;Burke, A T;Burr, C;Bursche, A;Butkevich, A;Butter, J S;Buytaert, J;Byczynski, W;Cadeddu, S;Cai, H;Calabrese, R;Calefice, L;Cali, S;Calladine, R;Calvi, M;Calvo Gomez, M;Campana, P;Campora Perez, D H;Campoverde Quezada, A F;Capelli, S;Capriotti, L;Carbone, A;Carboni, G;Cardinale, R;Cardini, A;Carli, I;Carniti, P;Carus, L;Casais Vidal, A;Caspary, R;Casse, G;Cattaneo, M;Cavallero, G;Cavallini, V;Celani, S;Cerasoli, J;Cervenkov, D;Chadwick, A J;Chapman, M G;Charles, M;Charpentier, Ph;Chavez Barajas, C A;Chefdeville, M;Chen, C;Chen, S;Chernov, 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2023-01-01
Abstract
An amplitude analysis of the B thorn & RARR; D thorn s D-s K thorn decay is carried out to study for the first time its intermediate resonant contributions, using proton-proton collision data collected with the LHCb detector at center-of-mass energies of 7, 8, and 13 TeV. A near-threshold peaking structure, referred to as X(3960), is observed in the D thorn s D-s invariant-mass spectrum with significance greater than 12 standard deviations. The mass, width, and the quantum numbers of the structure are measured to be 3956 1 5 1 10 MeV, 43 1 13 1 8 MeV, and JPC = 0 thorn thorn , respectively, where the first uncertainties are statistical and the second systematic. The properties of the new structure are consistent with recent theoretical predictions for a state composed of cc over bar ss over bar quarks. Evidence for an additional structure is found around 4140 MeV in the D thorn s D-s invariant mass, which might be caused either by a new resonance with the 0 thorn thorn assignment or by a J=& psi;& phi; & LRARR; D thorn s D-s coupled-channel effect.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11584/383906
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