Observation of New Ξ_{c}^{0} Baryons Decaying to Λ_{c}^{+}K^{-}

The LHCb Collaboration

doi:10.1103/PhysRevLett.124.222001

Observation of New Ξ_{c}^{0} Baryons Decaying to Λ_{c}^{+}K^{-}

The LHCb Collaboration

School of Physics and Astronomy

Research output: Contribution to journal › Article › Research › peer-review

71 Citations (Scopus)

Abstract

The Λ_{c}^{+}K^{-} mass spectrum is studied with a data sample of pp collisions at a center-of-mass energy of 13 TeV corresponding to an integrated luminosity of 5.6 fb^{-1} collected by the LHCb experiment. Three Ξ_{c}^{0} states are observed with a large significance and their masses and natural widths are measured to be m[Ξ_{c}(2923)^{0}]=2923.04±0.25±0.20±0.14 MeV, Γ[Ξ_{c}(2923)^{0}]=7.1±0.8±1.8 MeV, m[Ξ_{c}(2939)^{0}]=2938.55±0.21±0.17±0.14 MeV, Γ[Ξ_{c}(2939)^{0}]=10.2±0.8±1.1 MeV, m[Ξ_{c}(2965)^{0}]=2964.88±0.26±0.14±0.14 MeV, Γ[Ξ_{c}(2965)^{0}]=14.1±0.9±1.3 MeV, where the uncertainties are statistical, systematic, and due to the limited knowledge of the Λ_{c}^{+} mass. The Ξ_{c}(2923)^{0} and Ξ_{c}(2939)^{0} baryons are new states. The Ξ_{c}(2965)^{0} state is in the vicinity of the known Ξ_{c}(2970)^{0} baryon; however, their masses and natural widths differ significantly.

Original language	English
Article number	222001
Number of pages	11
Journal	Physical Review Letters
Volume	124
Issue number	22
DOIs	https://doi.org/10.1103/PhysRevLett.124.222001
Publication status	Published - 5 Jun 2020

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10.1103/PhysRevLett.124.222001

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@article{1f19cc61963642ad863acb36f24d05ed,

title = "Observation of New Ξ_{c}^{0} Baryons Decaying to Λ_{c}^{+}K^{-}",

abstract = "The Λ_{c}^{+}K^{-} mass spectrum is studied with a data sample of pp collisions at a center-of-mass energy of 13 TeV corresponding to an integrated luminosity of 5.6 fb^{-1} collected by the LHCb experiment. Three Ξ_{c}^{0} states are observed with a large significance and their masses and natural widths are measured to be m[Ξ_{c}(2923)^{0}]=2923.04±0.25±0.20±0.14 MeV, Γ[Ξ_{c}(2923)^{0}]=7.1±0.8±1.8 MeV, m[Ξ_{c}(2939)^{0}]=2938.55±0.21±0.17±0.14 MeV, Γ[Ξ_{c}(2939)^{0}]=10.2±0.8±1.1 MeV, m[Ξ_{c}(2965)^{0}]=2964.88±0.26±0.14±0.14 MeV, Γ[Ξ_{c}(2965)^{0}]=14.1±0.9±1.3 MeV, where the uncertainties are statistical, systematic, and due to the limited knowledge of the Λ_{c}^{+} mass. The Ξ_{c}(2923)^{0} and Ξ_{c}(2939)^{0} baryons are new states. The Ξ_{c}(2965)^{0} state is in the vicinity of the known Ξ_{c}(2970)^{0} baryon; however, their masses and natural widths differ significantly.",

author = "R. Aaij and {Abell{\'a}n Beteta}, C. and T. Ackernley and B. Adeva and M. Adinolfi and H. Afsharnia and Aidala, {C. A.} and S. Aiola and Z. Ajaltouni and S. Akar and J. Albrecht and F. Alessio and M. Alexander and {Alfonso Albero}, A. and G. Alkhazov and {Alvarez Cartelle}, P. and Alves, {A. A.} and S. Amato and Y. Amhis and L. An and L. Anderlini and G. Andreassi and M. Andreotti and F. Archilli and A. Artamonov and M. Artuso and K. Arzymatov and E. Aslanides and M. Atzeni and B. Audurier and S. Bachmann and Back, {J. J.} and S. Baker and V. Balagura and W. Baldini and {Baptista Leite}, J. and Barlow, {R. J.} and S. Barsuk and W. Barter and M. Bartolini and F. Baryshnikov and Basels, {J. M.} and G. Bassi and V. Batozskaya and B. Batsukh and A. Battig and A. Bay and M. Becker and F. Bedeschi and I. Bediaga and A. Beiter and V. Belavin and S. Belin and V. Bellee and K. Belous and I. Belyaev and G. Bencivenni and E. Ben-Haim and S. Benson and A. Berezhnoy and R. Bernet and D. Berninghoff and Bernstein, {H. C.} and C. Bertella and E. Bertholet and A. Bertolin and C. Betancourt and F. Betti and Bettler, {M. O.} and Ia Bezshyiko and S. Bhasin and J. Bhom and Bieker, {M. S.} and S. Bifani and P. Billoir and A. Bizzeti and M. Bj{\o}rn and Blago, {M. P.} and T. Blake and F. Blanc and S. Blusk and D. Bobulska and V. Bocci and {Boente Garcia}, O. and T. Boettcher and A. Boldyrev and A. Bondar and N. Bondar and S. Borghi and M. Borisyak and M. Borsato and Borsuk, {J. T.} and Bowcock, {T. J.V.} and A. Boyer and C. Bozzi and Bradley, {M. J.} and S. Braun and {Brea Rodriguez}, A. and M. Brodski and J. Brodzicka and {Brossa Gonzalo}, A. and D. Brundu and E. Buchanan and A. B{\"u}chler-Germann and A. Buonaura and C. Burr and A. Bursche and A. Butkevich and Butter, {J. S.} and J. Buytaert and W. Byczynski and S. Cadeddu and H. Cai and R. Calabrese and {Calero Diaz}, L. and S. Cali and R. Calladine and M. Calvi and {Calvo Gomez}, M. and {Camargo Magalhaes}, P. and A. Camboni and P. Campana and {Campora Perez}, {D. H.} and {Campoverde Quezada}, {A. F.} and L. Capriotti and A. Carbone and G. Carboni and R. Cardinale and A. Cardini and I. Carli and P. Carniti and {Carvalho Akiba}, K. and {Casais Vidal}, A. and G. Casse and M. Cattaneo and G. Cavallero and S. Celani and R. Cenci and J. Cerasoli and Chapman, {M. G.} and M. Charles and Ph Charpentier and G. Chatzikonstantinidis and M. Chefdeville and V. Chekalina and C. Chen and S. Chen and A. Chernov and Chitic, {S. G.} and V. Chobanova and S. Cholak and M. Chrzaszcz and A. Chubykin and V. Chulikov and P. Ciambrone and Cicala, {M. F.} and {Cid Vidal}, X. and G. Ciezarek and F. Cindolo and Clarke, {P. E.L.} and M. Clemencic and Cliff, {H. V.} and J. Closier and Cobbledick, {J. L.} and V. Coco and Coelho, {J. A.B.} and J. Cogan and E. Cogneras and L. Cojocariu and P. Collins and T. Colombo and A. Contu and N. Cooke and G. Coombs and S. Coquereau and G. Corti and {Costa Sobral}, {C. M.} and B. Couturier and Craik, {D. C.} and J. Crkovsk{\'a} and A. Crocombe and {Cruz Torres}, M. and R. Currie and {Da Silva}, {C. L.} and E. Dall'Occo and J. Dalseno and C. D'Ambrosio and A. Danilina and P. d'Argent and A. Davis and {De Aguiar Francisco}, O. and {De Bruyn}, K. and {De Capua}, S. and {De Cian}, M. and {De Miranda}, {J. M.} and {De Paula}, L. and {De Serio}, M. and {De Simone}, P. and {de Vries}, {J. A.} and Dean, {C. T.} and W. Dean and D. Decamp and {Del Buono}, L. and B. Delaney and Dembinski, {H. P.} and A. Dendek and V. Denysenko and D. Derkach and O. Deschamps and F. Desse and F. Dettori and B. Dey and {Di Canto}, A. and {Di Nezza}, P. and S. Didenko and H. Dijkstra and V. Dobishuk and F. Dordei and M. Dorigo and {Dos Reis}, {A. C.} and L. Douglas and A. Dovbnya and K. Dreimanis and Dudek, {M. W.} and L. Dufour and P. Durante and Durham, {J. M.} and D. Dutta and M. Dziewiecki and A. Dziurda and A. Dzyuba and S. Easo and U. Egede and V. Egorychev and S. Eidelman and S. Eisenhardt and S. Ek-In and L. Eklund and S. Ely and A. Ene and E. Epple and S. Escher and J. Eschle and S. Esen and T. Evans and A. Falabella and J. Fan and Y. Fan and N. Farley and T. Hadavizadeh and Lane, {Jake J.} and {The LHCb Collaboration}",

year = "2020",

month = jun,

day = "5",

doi = "10.1103/PhysRevLett.124.222001",

language = "English",

volume = "124",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "22",

}

TY - JOUR

T1 - Observation of New Ξ_{c}^{0} Baryons Decaying to Λ_{c}^{+}K^{-}

AU - Aaij, R.

AU - Abellán Beteta, C.

AU - Ackernley, T.

AU - Adeva, B.

AU - Adinolfi, M.

AU - Afsharnia, H.

AU - Aidala, C. A.

AU - Aiola, S.

AU - Ajaltouni, Z.

AU - Akar, S.

AU - Albrecht, J.

AU - Alessio, F.

AU - Alexander, M.

AU - Alfonso Albero, A.

AU - Alkhazov, G.

AU - Alvarez Cartelle, P.

AU - Alves, A. A.

AU - Amato, S.

AU - Amhis, Y.

AU - An, L.

AU - Anderlini, L.

AU - Andreassi, G.

AU - Andreotti, M.

AU - Archilli, F.

AU - Artamonov, A.

AU - Artuso, M.

AU - Arzymatov, K.

AU - Aslanides, E.

AU - Atzeni, M.

AU - Audurier, B.

AU - Bachmann, S.

AU - Back, J. J.

AU - Baker, S.

AU - Balagura, V.

AU - Baldini, W.

AU - Baptista Leite, J.

AU - Barlow, R. J.

AU - Barsuk, S.

AU - Barter, W.

AU - Bartolini, M.

AU - Baryshnikov, F.

AU - Basels, J. M.

AU - Bassi, G.

AU - Batozskaya, V.

AU - Batsukh, B.

AU - Battig, A.

AU - Bay, A.

AU - Becker, M.

AU - Bedeschi, F.

AU - Bediaga, I.

AU - Beiter, A.

AU - Belavin, V.

AU - Belin, S.

AU - Bellee, V.

AU - Belous, K.

AU - Belyaev, I.

AU - Bencivenni, G.

AU - Ben-Haim, E.

AU - Benson, S.

AU - Berezhnoy, A.

AU - Bernet, R.

AU - Berninghoff, D.

AU - Bernstein, H. C.

AU - Bertella, C.

AU - Bertholet, E.

AU - Bertolin, A.

AU - Betancourt, C.

AU - Betti, F.

AU - Bettler, M. O.

AU - Bezshyiko, Ia

AU - Bhasin, S.

AU - Bhom, J.

AU - Bieker, M. S.

AU - Bifani, S.

AU - Billoir, P.

AU - Bizzeti, A.

AU - Bjørn, M.

AU - Blago, M. P.

AU - Blake, T.

AU - Blanc, F.

AU - Blusk, S.

AU - Bobulska, D.

AU - Bocci, V.

AU - Boente Garcia, O.

AU - Boettcher, T.

AU - Boldyrev, A.

AU - Bondar, A.

AU - Bondar, N.

AU - Borghi, S.

AU - Borisyak, M.

AU - Borsato, M.

AU - Borsuk, J. T.

AU - Bowcock, T. J.V.

AU - Boyer, A.

AU - Bozzi, C.

AU - Bradley, M. J.

AU - Braun, S.

AU - Brea Rodriguez, A.

AU - Brodski, M.

AU - Brodzicka, J.

AU - Brossa Gonzalo, A.

AU - Brundu, D.

AU - Buchanan, E.

AU - Büchler-Germann, A.

AU - Buonaura, A.

AU - Burr, C.

AU - Bursche, A.

AU - Butkevich, A.

AU - Butter, J. S.

AU - Buytaert, J.

AU - Byczynski, W.

AU - Cadeddu, S.

AU - Cai, H.

AU - Calabrese, R.

AU - Calero Diaz, L.

AU - Cali, S.

AU - Calladine, R.

AU - Calvi, M.

AU - Calvo Gomez, M.

AU - Camargo Magalhaes, P.

AU - Camboni, A.

AU - Campana, P.

AU - Campora Perez, D. H.

AU - Campoverde Quezada, A. F.

AU - Capriotti, L.

AU - Carbone, A.

AU - Carboni, G.

AU - Cardinale, R.

AU - Cardini, A.

AU - Carli, I.

AU - Carniti, P.

AU - Carvalho Akiba, K.

AU - Casais Vidal, A.

AU - Casse, G.

AU - Cattaneo, M.

AU - Cavallero, G.

AU - Celani, S.

AU - Cenci, R.

AU - Cerasoli, J.

AU - Chapman, M. G.

AU - Charles, M.

AU - Charpentier, Ph

AU - Chatzikonstantinidis, G.

AU - Chefdeville, M.

AU - Chekalina, V.

AU - Chen, C.

AU - Chen, S.

AU - Chernov, A.

AU - Chitic, S. G.

AU - Chobanova, V.

AU - Cholak, S.

AU - Chrzaszcz, M.

AU - Chubykin, A.

AU - Chulikov, V.

AU - Ciambrone, P.

AU - Cicala, M. F.

AU - Cid Vidal, X.

AU - Ciezarek, G.

AU - Cindolo, F.

AU - Clarke, P. E.L.

AU - Clemencic, M.

AU - Cliff, H. V.

AU - Closier, J.

AU - Cobbledick, J. L.

AU - Coco, V.

AU - Coelho, J. A.B.

AU - Cogan, J.

AU - Cogneras, E.

AU - Cojocariu, L.

AU - Collins, P.

AU - Colombo, T.

AU - Contu, A.

AU - Cooke, N.

AU - Coombs, G.

AU - Coquereau, S.

AU - Corti, G.

AU - Costa Sobral, C. M.

AU - Couturier, B.

AU - Craik, D. C.

AU - Crkovská, J.

AU - Crocombe, A.

AU - Cruz Torres, M.

AU - Currie, R.

AU - Da Silva, C. L.

AU - Dall'Occo, E.

AU - Dalseno, J.

AU - D'Ambrosio, C.

AU - Danilina, A.

AU - d'Argent, P.

AU - Davis, A.

AU - De Aguiar Francisco, O.

AU - De Bruyn, K.

AU - De Capua, S.

AU - De Cian, M.

AU - De Miranda, J. M.

AU - De Paula, L.

AU - De Serio, M.

AU - De Simone, P.

AU - de Vries, J. A.

AU - Dean, C. T.

AU - Dean, W.

AU - Decamp, D.

AU - Del Buono, L.

AU - Delaney, B.

AU - Dembinski, H. P.

AU - Dendek, A.

AU - Denysenko, V.

AU - Derkach, D.

AU - Deschamps, O.

AU - Desse, F.

AU - Dettori, F.

AU - Dey, B.

AU - Di Canto, A.

AU - Di Nezza, P.

AU - Didenko, S.

AU - Dijkstra, H.

AU - Dobishuk, V.

AU - Dordei, F.

AU - Dorigo, M.

AU - Dos Reis, A. C.

AU - Douglas, L.

AU - Dovbnya, A.

AU - Dreimanis, K.

AU - Dudek, M. W.

AU - Dufour, L.

AU - Durante, P.

AU - Durham, J. M.

AU - Dutta, D.

AU - Dziewiecki, M.

AU - Dziurda, A.

AU - Dzyuba, A.

AU - Easo, S.

AU - Egede, U.

AU - Egorychev, V.

AU - Eidelman, S.

AU - Eisenhardt, S.

AU - Ek-In, S.

AU - Eklund, L.

AU - Ely, S.

AU - Ene, A.

AU - Epple, E.

AU - Escher, S.

AU - Eschle, J.

AU - Esen, S.

AU - Evans, T.

AU - Falabella, A.

AU - Fan, J.

AU - Fan, Y.

AU - Farley, N.

AU - Hadavizadeh, T.

AU - Lane, Jake J.

AU - The LHCb Collaboration

PY - 2020/6/5

Y1 - 2020/6/5

N2 - The Λ_{c}^{+}K^{-} mass spectrum is studied with a data sample of pp collisions at a center-of-mass energy of 13 TeV corresponding to an integrated luminosity of 5.6 fb^{-1} collected by the LHCb experiment. Three Ξ_{c}^{0} states are observed with a large significance and their masses and natural widths are measured to be m[Ξ_{c}(2923)^{0}]=2923.04±0.25±0.20±0.14 MeV, Γ[Ξ_{c}(2923)^{0}]=7.1±0.8±1.8 MeV, m[Ξ_{c}(2939)^{0}]=2938.55±0.21±0.17±0.14 MeV, Γ[Ξ_{c}(2939)^{0}]=10.2±0.8±1.1 MeV, m[Ξ_{c}(2965)^{0}]=2964.88±0.26±0.14±0.14 MeV, Γ[Ξ_{c}(2965)^{0}]=14.1±0.9±1.3 MeV, where the uncertainties are statistical, systematic, and due to the limited knowledge of the Λ_{c}^{+} mass. The Ξ_{c}(2923)^{0} and Ξ_{c}(2939)^{0} baryons are new states. The Ξ_{c}(2965)^{0} state is in the vicinity of the known Ξ_{c}(2970)^{0} baryon; however, their masses and natural widths differ significantly.

AB - The Λ_{c}^{+}K^{-} mass spectrum is studied with a data sample of pp collisions at a center-of-mass energy of 13 TeV corresponding to an integrated luminosity of 5.6 fb^{-1} collected by the LHCb experiment. Three Ξ_{c}^{0} states are observed with a large significance and their masses and natural widths are measured to be m[Ξ_{c}(2923)^{0}]=2923.04±0.25±0.20±0.14 MeV, Γ[Ξ_{c}(2923)^{0}]=7.1±0.8±1.8 MeV, m[Ξ_{c}(2939)^{0}]=2938.55±0.21±0.17±0.14 MeV, Γ[Ξ_{c}(2939)^{0}]=10.2±0.8±1.1 MeV, m[Ξ_{c}(2965)^{0}]=2964.88±0.26±0.14±0.14 MeV, Γ[Ξ_{c}(2965)^{0}]=14.1±0.9±1.3 MeV, where the uncertainties are statistical, systematic, and due to the limited knowledge of the Λ_{c}^{+} mass. The Ξ_{c}(2923)^{0} and Ξ_{c}(2939)^{0} baryons are new states. The Ξ_{c}(2965)^{0} state is in the vicinity of the known Ξ_{c}(2970)^{0} baryon; however, their masses and natural widths differ significantly.

UR - http://www.scopus.com/inward/record.url?scp=85086875268&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.124.222001

DO - 10.1103/PhysRevLett.124.222001

M3 - Article

C2 - 32567908

AN - SCOPUS:85086875268

SN - 0031-9007

VL - 124

JO - Physical Review Letters

JF - Physical Review Letters

IS - 22

M1 - 222001

ER -

Observation of New Ξ_{c}^{0} Baryons Decaying to Λ_{c}^{+}K^{-}

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