Observation of Two New Excited Ξ_{b}^{0} States Decaying to Λ_{b}^{0}K^{-}π^{+}

Aaij, R.; Abdelmotteleb, A.S.W.; Abellán Beteta, C.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Afsharnia, H.; Agapopoulou, C.; Aidala, C.A.; Aiola, S.; Ajaltouni, Z.; Akar, S.; Albrecht, J.; Alessio, F.; Alexander, M.; Alfonso Albero, A.; Aliouche, Z.; Alkhazov, G.; Alvarez Cartelle, P.; Amato, S.; Amey, J.L.; Amhis, Y.; An, L.; Anderlini, L.; Andreianov, A.; Andreotti, M.; Archilli, F.; Artamonov, A.; Artuso, M.; Arzymatov, K.; Aslanides, E.; Atzeni, M.; Audurier, B.; Bachmann, S.; Bachmayer, M.; Back, J.J.; Baladron Rodriguez, P.; Balagura, V.; Baldini, W.; Baptista Leite, J.; Barbetti, M.; Barlow, R.J.; Barsuk, S.; Barter, W.; Bartolini, M.; Baryshnikov, F.; Basels, J.M.; Bashir, S.; Bassi, G.; Batsukh, B.; Battig, A.; Bay, A.; Beck, A.; Becker, M.; Bedeschi, F.; Bediaga, I.; Beiter, A.; Belavin, V.; Belin, S.; Bellee, V.; Belous, K.; Belov, I.; Belyaev, I.; Bencivenni, G.; Ben-Haim, E.; Berezhnoy, A.; Bernet, R.; Berninghoff, D.; Bernstein, H.C.; Bertella, C.; Bertolin, A.; Betancourt, C.; Betti, F.; Bezshyiko, I.; Bhasin, S.; Bhom, J.; Bian, L.; Bieker, M.S.; Bifani, S.; Billoir, P.; Birch, M.; Bishop, F.C.R.; Bitadze, A.; Bizzeti, A.; Bjørn, M.; Blago, M.P.; Blake, T.; Blanc, F.; Blusk, S.; Bobulska, D.; Boelhauve, J.A.; Boente Garcia, O.; Boettcher, T.; Boldyrev, A.; Bondar, A.; Bondar, N.; Borghi, S.; Borisyak, M.; Borsato, M.; Borsuk, J.T.; Bouchiba, S.A.; Bowcock, T.J.V.; Boyer, A.; Bozzi, C.; Bradley, M.J.; Braun, S.; Brea Rodriguez, A.; Brodski, M.; Brodzicka, J.; Brossa Gonzalo, A.; 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.; Calero Diaz, L.; Cali, S.; Calladine, R.; Calvi, M.; Calvo Gomez, M.; Camargo Magalhaes, P.; Campana, P.; Campoverde Quezada, A.F.; Capelli, S.; Capriotti, L.; Carbone, A.; Carboni, G.; Cardinale, R.; Cardini, A.; Carli, I.; Carniti, P.; Carus, L.; Carvalho Akiba, K.; Casais Vidal, A.; Casse, G.; Cattaneo, M.; Cavallero, G.; Celani, S.; Cerasoli, J.; Cervenkov, D.; Chadwick, A.J.; Chapman, M.G.; Charles, M.; Charpentier, P.; Chatzikonstantinidis, G.; Chavez Barajas, C.A.; Chefdeville, M.; Chen, C.; Chen, S.; Chernov, A.; Chobanova, V.; Cholak, S.; Chrzaszcz, M.; Chubykin, A.; Chulikov, V.; Ciambrone, P.; Cicala, M.F.; Cid Vidal, X.; Ciezarek, G.; Clarke, P.E.L.; Clemencic, M.; Cliff, H.V.; Closier, J.; Cobbledick, J.L.; Coco, V.; Coelho, J.A.B.; Cogan, J.; Cogneras, E.; Cojocariu, L.; Collins, P.; Colombo, T.; Congedo, L.; Contu, A.; Cooke, N.; Coombs, G.; Corredoira, I.; Corti, G.; Costa Sobral, C.M.; Couturier, B.; Craik, D.C.; Crkovská, J.; Cruz Torres, M.; Currie, R.; Da Silva, C.L.; Dadabaev, S.; Dai, L.; Dall'Occo, E.; Dalseno, J.; D'Ambrosio, C.; Danilina, A.; D'Argent, P.; Davies, J.E.; Davis, A.; De Aguiar Francisco, O.; De Bruyn, K.; De Capua, S.; De Cian, M.; De Miranda, J.M.; De Paula, L.; De Serio, M.; De Simone, D.; De Simone, P.; de Vries, J.A.; Dean, C.T.; Decamp, D.; Dedu, V.; Del Buono, L.; Delaney, B.; Dembinski, H.; Dendek, A.; Denysenko, V.; Derkach, D.; Deschamps, O.; Desse, F.; Dettori, F.; Dey, B.; Di Cicco, A.; Di Nezza, P.; Didenko, S.; Dieste Maronas, L.; Dijkstra, H.; Dobishuk, V.; Dong, C.; Donohoe, A.M.; Dordei, F.; Dos Reis, A.C.; Douglas, L.; Dovbnya, A.; Downes, A.G.; Dudek, M.W.; Dufour, L.; Duk, V.; Durante, P.; Durham, J.M.; Dutta, D.; Dziurda, A.; Dzyuba, A.; Easo, S.; Egede, U.; Egorychev, V.; Eidelman, S.; Eisenhardt, S.; Ek-In, S.; Eklund, L.; Ely, S.; Ene, A.; Epple, E.; Escher, S.; Eschle, J.; Esen, S.; Evans, T.; Falabella, A.; Fan, J.; Fan, Y.; Fang, B.; Farry, S.; Fazzini, D.; Féo, M.; Fernandez Prieto, A.; Fernez, A.D.; Ferrari, F.; Ferreira Lopes, L.; Ferreira Rodrigues, F.; Ferreres Sole, S.; Ferrillo, M.; Ferro-Luzzi, M.; Filippov, S.; Fini, R.A.; Fiorini, M.; Firlej, M.; Fischer, K.M.; Fitzgerald, D.S.; Fitzpatrick, C.; Fiutowski, T.; Fkiaras, A.; Fleuret, F.; Fontana, M.; Fontanelli, F.; Forty, R.; Foulds-Holt, D.; Franco Lima, V.; Franco Sevilla, M.; Frank, M.; Franzoso, E.; Frau, G.; Frei, C.; Friday, D.A.; Fu, J.; Fuehring, Q.; Gabriel, E.; Gallas Torreira, A.; Galli, D.; Gambetta, S.; Gan, Y.; Gandelman, M.; Gandini, P.; Gao, Y.; Garau, M.; Garcia Martin, L.M.; Garcia Moreno, P.; García Pardiñas, J.; Garcia Plana, B.; Garcia Rosales, F.A.; Garrido, L.; Gaspar, C.; Geertsema, R.E.; Gerick, D.; Gerken, L.L.; Gersabeck, E.; Gersabeck, M.; Gershon, T.; Gerstel, D.; Ghez, P.; Giambastiani, L.; Gibson, V.; Giemza, H.K.; Gilman, A.L.; Giovannetti, M.; Gioventù, A.; Gironella Gironell, P.; Giubega, L.; Giugliano, C.; Gizdov, K.; Gkougkousis, E.L.; Gligorov, V.V.; Göbel, C.; Golobardes, E.; Golubkov, D.; Golutvin, A.; Gomes, A.; Gomez Fernandez, S.; Goncalves Abrantes, F.; Goncerz, M.; Gong, G.; Gorbounov, P.; Gorelov, I.V.; Gotti, C.; Govorkova, E.; Grabowski, J.P.; Grammatico, T.; Granado Cardoso, L.A.; Graugés, E.; Graverini, E.; Graziani, G.; Grecu, A.; Greeven, L.M.; Grieser, N.A.; Grillo, L.; Gromov, S.; Gruberg Cazon, B.R.; 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doi:10.1103/PhysRevLett.128.162001

Two narrow resonant states are observed in the Λ_{b}^{0}K^{-}π^{+} mass spectrum using a data sample of proton-proton collisions at a center-of-mass energy of 13 TeV, collected by the LHCb experiment and corresponding to an integrated luminosity of 6 fb^{-1}. The minimal quark content of the Λ_{b}^{0}K^{-}π^{+} system indicates that these are excited Ξ_{b}^{0} baryons. The masses of the Ξ_{b}(6327)^{0} and Ξ_{b}(6333)^{0} states are m[Ξ_{b}(6327)^{0}]=6327.28_{-0.21}^{+0.23}±0.12±0.24 and m[Ξ_{b}(6333)^{0}]=6332.69_{-0.18}^{+0.17}±0.03±0.22 MeV, respectively, with a mass splitting of Δm=5.41_{-0.27}^{+0.26}±0.12 MeV, where the uncertainties are statistical, systematic, and due to the Λ_{b}^{0} mass measurement. The measured natural widths of these states are consistent with zero, with upper limits of Γ[Ξ_{b}(6327)^{0}]<2.20(2.56) and Γ[Ξ_{b}(6333)^{0}]<1.60(1.92) MeV at a 90% (95%) credibility level. The significance of the two-peak hypothesis is larger than nine (five) Gaussian standard deviations compared to the no-peak (one-peak) hypothesis. The masses, widths, and resonant structure of the new states are in good agreement with the expectations for a doublet of 1D Ξ_{b}^{0} resonances.

Observation of Two New Excited Ξ_{b}^{0} States Decaying to Λ_{b}^{0}K^{-}π^{+} / R. Aaij, A.S.W. Abdelmotteleb, C. Abellán Beteta, T. Ackernley, B. Adeva, M. Adinolfi, H. Afsharnia, C. Agapopoulou, C.A. Aidala, S. Aiola, Z. Ajaltouni, S. Akar, J. Albrecht, F. Alessio, M. Alexander, A. Alfonso Albero, Z. Aliouche, G. Alkhazov, P. Alvarez Cartelle, S. Amato, J.L. Amey, Y. Amhis, L. An, L. Anderlini, A. Andreianov, M. Andreotti, F. Archilli, A. Artamonov, M. Artuso, K. Arzymatov, E. Aslanides, M. Atzeni, B. Audurier, S. Bachmann, M. Bachmayer, J.J. Back, P. Baladron Rodriguez, V. Balagura, W. Baldini, J. Baptista Leite, M. Barbetti, R.J. Barlow, S. Barsuk, W. Barter, M. Bartolini, F. Baryshnikov, J.M. Basels, S. Bashir, G. Bassi, B. Batsukh, A. Battig, A. Bay, A. Beck, M. Becker, F. Bedeschi, I. Bediaga, A. Beiter, V. Belavin, S. Belin, V. Bellee, K. Belous, I. Belov, I. Belyaev, G. Bencivenni, E. Ben-Haim, A. Berezhnoy, R. Bernet, D. Berninghoff, H.C. Bernstein, C. Bertella, A. Bertolin, C. Betancourt, F. Betti, I. Bezshyiko, S. Bhasin, J. Bhom, L. Bian, M.S. Bieker, S. Bifani, P. Billoir, M. Birch, F.C.R. Bishop, A. Bitadze, A. Bizzeti, M. Bjørn, M.P. Blago, T. Blake, F. Blanc, S. Blusk, D. Bobulska, J.A. Boelhauve, O. Boente Garcia, T. Boettcher, A. Boldyrev, A. Bondar, N. Bondar, S. Borghi, M. Borisyak, M. Borsato, J.T. Borsuk, S.A. Bouchiba, T.J.V. Bowcock, A. Boyer, C. Bozzi, M.J. Bradley, S. Braun, A. Brea Rodriguez, M. Brodski, J. Brodzicka, A. Brossa Gonzalo, D. Brundu, A. Buonaura, L. Buonincontri, A.T. Burke, C. Burr, A. Bursche, A. Butkevich, J.S. Butter, J. Buytaert, W. Byczynski, S. Cadeddu, H. Cai, R. Calabrese, L. Calefice, L. Calero Diaz, S. Cali, R. Calladine, M. Calvi, M. Calvo Gomez, P. Camargo Magalhaes, P. Campana, A.F. Campoverde Quezada, S. Capelli, L. Capriotti, A. Carbone, G. Carboni, R. Cardinale, A. Cardini, I. Carli, P. Carniti, L. Carus, K. Carvalho Akiba, A. Casais Vidal, G. Casse, M. Cattaneo, G. Cavallero, S. Celani, J. Cerasoli, D. Cervenkov, A.J. Chadwick, M.G. Chapman, M. Charles, P. Charpentier, G. Chatzikonstantinidis, C.A. Chavez Barajas, M. Chefdeville, C. Chen, S. Chen, A. Chernov, V. Chobanova, S. Cholak, M. Chrzaszcz, A. Chubykin, V. Chulikov, P. Ciambrone, M.F. Cicala, X. Cid Vidal, G. Ciezarek, P.E.L. Clarke, M. Clemencic, H.V. Cliff, J. Closier, J.L. Cobbledick, V. Coco, J.A.B. Coelho, J. Cogan, E. Cogneras, L. Cojocariu, P. Collins, T. Colombo, L. Congedo, A. Contu, N. Cooke, G. Coombs, I. Corredoira, G. Corti, C.M. Costa Sobral, B. Couturier, D.C. Craik, J. Crkovská, M. Cruz Torres, R. Currie, C.L. Da Silva, S. Dadabaev, L. Dai, E. Dall'Occo, J. Dalseno, C. D'Ambrosio, A. Danilina, P. D'Argent, J.E. Davies, A. Davis, O. De Aguiar Francisco, K. De Bruyn, S. De Capua, M. De Cian, J.M. De Miranda, L. De Paula, M. De Serio, D. De Simone, P. De Simone, J.A. de Vries, C.T. Dean, D. Decamp, V. Dedu, L. Del Buono, B. Delaney, H. Dembinski, A. Dendek, V. Denysenko, D. Derkach, O. Deschamps, F. 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[10.1103/PhysRevLett.128.162001]

Observation of Two New Excited Ξ_{b}^{0} States Decaying to Λ_{b}^{0}K^{-}π^{+}

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2022

Abstract

Two narrow resonant states are observed in the Λ_{b}^{0}K^{-}π^{+} mass spectrum using a data sample of proton-proton collisions at a center-of-mass energy of 13 TeV, collected by the LHCb experiment and corresponding to an integrated luminosity of 6 fb^{-1}. The minimal quark content of the Λ_{b}^{0}K^{-}π^{+} system indicates that these are excited Ξ_{b}^{0} baryons. The masses of the Ξ_{b}(6327)^{0} and Ξ_{b}(6333)^{0} states are m[Ξ_{b}(6327)^{0}]=6327.28_{-0.21}^{+0.23}±0.12±0.24 and m[Ξ_{b}(6333)^{0}]=6332.69_{-0.18}^{+0.17}±0.03±0.22 MeV, respectively, with a mass splitting of Δm=5.41_{-0.27}^{+0.26}±0.12 MeV, where the uncertainties are statistical, systematic, and due to the Λ_{b}^{0} mass measurement. The measured natural widths of these states are consistent with zero, with upper limits of Γ[Ξ_{b}(6327)^{0}]<2.20(2.56) and Γ[Ξ_{b}(6333)^{0}]<1.60(1.92) MeV at a 90% (95%) credibility level. The significance of the two-peak hypothesis is larger than nine (five) Gaussian standard deviations compared to the no-peak (one-peak) hypothesis. The masses, widths, and resonant structure of the new states are in good agreement with the expectations for a doublet of 1D Ξ_{b}^{0} resonances.

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	Settori scientifico-disciplinari dell'articolo
	
			Settore FIS/01 - Fisica Sperimentale
Settore FIS/04 - Fisica Nucleare e Subnucleare
		
	Data di pubblicazione
	
			21-apr-2022
		
	Rivista in ANCE
	
			PHYSICAL REVIEW LETTERS
		
	DOI
	
			https://dx.doi.org/10.1103/PhysRevLett.128.162001
		
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			01 - Articolo su periodico

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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/1024675

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