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Observation of the doubly charmed baryon $\Xi_{cc}^{++}$

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arxiv 1707.01621 v2 pith:356VQMDC submitted 2017-07-06 hep-ex

LHCb collaboration: R. Aaij , B. Adeva , M. Adinolfi , Z. Ajaltouni , S. Akar , J. Albrecht , F. Alessio , M. Alexander
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A. Alfonso Albero S. Ali G. Alkhazov P. Alvarez Cartelle A.A. Alves Jr S. Amato S. Amerio Y. Amhis L. An L. Anderlini G. Andreassi M. Andreotti J.E. Andrews R.B. Appleby F. Archilli P. d'Argent J. Arnau Romeu A. Artamonov M. Artuso E. Aslanides G. Auriemma M. Baalouch I. Babuschkin S. Bachmann J.J. Back A. Badalov C. Baesso S. Baker V. Balagura W. Baldini A. Baranov R.J. Barlow C. Barschel S. Barsuk W. Barter F. Baryshnikov V. Batozskaya V. Battista A. Bay L. Beaucourt J. Beddow F. Bedeschi I. Bediaga A. Beiter L.J. Bel N. Beliy V. Bellee N. Belloli K. Belous I. Belyaev E. Ben-Haim G. Bencivenni S. Benson S. Beranek A. Berezhnoy R. Bernet D. Berninghoff E. Bertholet A. Bertolin C. Betancourt F. Betti M.-O. Bettler M. van Beuzekom Ia. Bezshyiko S. Bifani P. Billoir A. Birnkraut A. Bitadze A. Bizzeti M.B. Bjoern T. Blake F. Blanc J. Blouw S. Blusk V. Bocci T. Boettcher A. Bondar N. Bondar W. Bonivento I. Bordyuzhin A. Borgheresi S. Borghi M. Borisyak M. Borsato M. Borysova F. Bossu M. Boubdir T.J.V. Bowcock E. Bowen C. Bozzi S. Braun T. Britton J. Brodzicka D. Brundu E. Buchanan C. Burr A. Bursche J. Buytaert W. Byczynski S. Cadeddu H. Cai R. Calabrese R. Calladine M. Calvi M. Calvo Gomez A. Camboni P. Campana D.H. Campora Perez L. Capriotti A. Carbone G. Carboni R. Cardinale A. Cardini P. Carniti L. Carson K. Carvalho Akiba G. Casse L. Cassina L. Castillo Garcia M. Cattaneo G. Cavallero R. Cenci D. Chamont M. Charles Ph. Charpentier G. Chatzikonstantinidis M. Chefdeville S. Chen S.F. Cheung S.-G. Chitic V. Chobanova M. Chrzaszcz A. Chubykin P. Ciambrone X. Cid Vidal G. Ciezarek P.E.L. Clarke M. Clemencic H.V. Cliff J. Closier J. Cogan E. Cogneras V. Cogoni L. Cojocariu P. Collins T. Colombo A. Comerma-Montells A. Contu A. Cook G. Coombs S. Coquereau G. Corti M. Corvo C.M. Costa Sobral B. Couturier G.A. Cowan D.C. Craik A. Crocombe M. Cruz Torres R. Currie C. D'Ambrosio F. Da Cunha Marinho E. Dall'Occo J. Dalseno A. Davis O. De Aguiar Francisco S. De Capua M. De Cian J.M. De Miranda L. De Paula M. De Serio P. De Simone C.T. Dean D. Decamp L. Del Buono H.-P. Dembinski M. Demmer A. Dendek D. Derkach O. Deschamps F. Dettori B. Dey A. Di Canto P. Di Nezza H. Dijkstra F. Dordei M. Dorigo A. Dosil Suárez L. Douglas A. Dovbnya K. Dreimanis L. Dufour G. Dujany P. Durante R. Dzhelyadin M. Dziewiecki A. Dziurda A. Dzyuba S. Easo M. Ebert U. Egede V. Egorychev S. Eidelman S. Eisenhardt U. Eitschberger R. Ekelhof L. Eklund S. Ely S. Esen H.M. Evans T. Evans A. Falabella N. Farley S. Farry R. Fay D. Fazzini L. Federici D. Ferguson G. Fernandez P. Fernandez Declara A. Fernandez Prieto F. Ferrari F. Ferreira Rodrigues M. Ferro-Luzzi S. Filippov R.A. Fini M. Fiore M. Fiorini M. Firlej C. Fitzpatrick T. Fiutowski F. Fleuret K. Fohl M. Fontana F. Fontanelli D.C. Forshaw R. Forty V. Franco Lima M. Frank C. Frei J. Fu W. Funk E. Furfaro C. Färber E. Gabriel A. Gallas Torreira D. Galli S. Gallorini S. Gambetta M. Gandelman P. Gandini Y. Gao L.M. Garcia Martin J. García Pardiñas J. Garra Tico L. Garrido P.J. Garsed D. Gascon C. Gaspar L. Gavardi G. Gazzoni D. Gerick E. Gersabeck M. Gersabeck T. Gershon Ph. Ghez S. Gianì V. Gibson O.G. Girard L. Giubega K. Gizdov V.V. Gligorov D. Golubkov A. Golutvin A. Gomes I.V. Gorelov C. Gotti E. Govorkova J.P. Grabowski R. Graciani Diaz L.A. Granado Cardoso E. Graugés E. Graverini G. Graziani A. Grecu R. Greim P. Griffith L. Grillo L. Gruber B.R. Gruberg Cazon O. Grünberg E. Gushchin Yu. Guz T. Gys C. Göbel T. Hadavizadeh C. Hadjivasiliou G. Haefeli C. Haen S.C. Haines B. Hamilton X. Han T. Hancock S. Hansmann-Menzemer N. Harnew S.T. Harnew J. Harrison C. Hasse M. Hatch J. He M. Hecker K. Heinicke A. Heister K. Hennessy P. Henrard L. Henry E. van Herwijnen M. He{ss} A. Hicheur D. Hill C. Hombach P.H. Hopchev Z.-C. Huard W. Hulsbergen T. Humair M. Hushchyn D. Hutchcroft P. Ibis M. Idzik P. Ilten R. Jacobsson J. Jalocha E. Jans A. Jawahery F. Jiang M. John D. Johnson C.R. Jones C. Joram B. Jost N. Jurik S. Kandybei M. Karacson J.M. Kariuki S. Karodia N. Kazeev M. Kecke M. Kelsey M. Kenzie T. Ketel E. Khairullin B. Khanji C. Khurewathanakul T. Kirn S. Klaver K. Klimaszewski T. Klimkovich S. Koliiev M. Kolpin I. Komarov R. Kopecna P. Koppenburg A. Kosmyntseva S. Kotriakhova M. Kozeiha M. Kreps P. Krokovny F. Kruse W. Krzemien W. Kucewicz M. Kucharczyk V. Kudryavtsev A.K. Kuonen K. Kurek T. Kvaratskheliya D. Lacarrere G. Lafferty A. Lai G. Lanfranchi C. Langenbruch T. Latham C. Lazzeroni R. Le Gac J. van Leerdam A. Leflat J. Lefrançois R. Lefèvre F. Lemaitre E. Lemos Cid O. Leroy T. Lesiak B. Leverington P.-R. Li T. Li Y. Li Z. Li T. Likhomanenko R. Lindner F. Lionetto V. Lisovskyi X. Liu D. Loh A. Loi I. Longstaff J.H. Lopes D. Lucchesi M. Lucio Martinez H. Luo A. Lupato E. Luppi O. Lupton A. Lusiani X. Lyu F. Machefert F. Maciuc V. Macko P. Mackowiak B. Maddock S. Maddrell-Mander O. Maev K. Maguire D. Maisuzenko M.W. Majewski S. Malde A. Malinin T. Maltsev G. Manca G. Mancinelli P. Manning D. Marangotto J. Maratas J.F. Marchand U. Marconi C. Marin Benito M. Marinangeli P. Marino J. Marks G. Martellotti M. Martin M. Martinelli D. Martinez Santos F. Martinez Vidal D. Martins Tostes L.M. Massacrier A. Massafferri R. Matev A. Mathad Z. Mathe C. Matteuzzi A. Mauri E. Maurice B. Maurin A. Mazurov M. McCann A. McNab R. McNulty J.V. Mead B. Meadows C. Meaux F. Meier N. Meinert D. Melnychuk M. Merk A. Merli E. Michielin D.A. Milanes E. Millard M.-N. Minard L. Minzoni D.S. Mitzel A. Mogini J. Molina Rodriguez T. Mombacher I.A. Monroy S. Monteil M. Morandin M.J. Morello O. Morgunova J. Moron A.B. Morris R. Mountain F. Muheim M. Mulder D. Müller J. Müller K. Müller V. Müller P. Naik T. Nakada R. Nandakumar A. Nandi I. Nasteva M. Needham N. Neri S. Neubert N. Neufeld M. Neuner T.D. Nguyen C. Nguyen-Mau S. Nieswand R. Niet N. Nikitin T. Nikodem A. Nogay D.P. O'Hanlon A. Oblakowska-Mucha V. Obraztsov S. Ogilvy R. Oldeman C.J.G. Onderwater A. Ossowska J.M. Otalora Goicochea P. Owen A. Oyanguren P.R. Pais A. Palano M. Palutan A. Papanestis M. Pappagallo L.L. Pappalardo C. Pappenheimer W. Parker C. Parkes G. Passaleva A. Pastore M. Patel C. Patrignani A. Pearce A. Pellegrino G. Penso M. Pepe Altarelli S. Perazzini P. Perret L. Pescatore K. Petridis A. Petrolini A. Petrov M. Petruzzo E. Picatoste Olloqui B. Pietrzyk M. Pikies D. Pinci A. Pistone A. Piucci V. Placinta S. Playfer M. Plo Casasus F. Polci M. Poli Lener A. Poluektov I. Polyakov E. Polycarpo G.J. Pomery S. Ponce A. Popov D. Popov S. Poslavskii C. Potterat E. Price J. Prisciandaro C. Prouve V. Pugatch A. Puig Navarro H. Pullen G. Punzi W. Qian R. Quagliani B. Quintana B. Rachwal J.H. Rademacker M. Rama M. Ramos Pernas M.S. Rangel I. Raniuk F. Ratnikov G. Raven M. Ravonel Salzgeber M. Reboud F. Redi S. Reichert A.C. dos Reis C. Remon Alepuz V. Renaudin S. Ricciardi S. Richards M. Rihl K. Rinnert V. Rives Molina P. Robbe A. Robert A.B. Rodrigues E. Rodrigues J.A. Rodriguez Lopez P. Rodriguez Perez A. Rogozhnikov S. Roiser A. Rollings V. Romanovskiy A. Romero Vidal J.W. Ronayne M. Rotondo M.S. Rudolph T. Ruf P. Ruiz Valls J. Ruiz Vidal J.J. Saborido Silva E. Sadykhov N. Sagidova B. Saitta V. Salustino Guimaraes D. Sanchez Gonzalo C. Sanchez Mayordomo B. Sanmartin Sedes R. Santacesaria C. Santamarina Rios M. Santimaria E. Santovetti G. Sarpis A. Sarti C. Satriano A. Satta D.M. Saunders D. Savrina S. Schael M. Schellenberg M. Schiller H. Schindler M. Schlupp M. Schmelling T. Schmelzer B. Schmidt O. Schneider A. Schopper H.F. Schreiner K. Schubert M. Schubiger M.-H. Schune R. Schwemmer B. Sciascia A. Sciubba A. Semennikov A. Sergi N. Serra J. Serrano L. Sestini P. Seyfert M. Shapkin I. Shapoval Y. Shcheglov T. Shears L. Shekhtman V. Shevchenko B.G. Siddi R. Silva Coutinho L. Silva de Oliveira G. Simi S. Simone M. Sirendi N. Skidmore T. Skwarnicki E. Smith I.T. Smith J. Smith M. Smith L. Soares Lavra M.D. Sokoloff F.J.P. Soler B. Souza De Paula B. Spaan P. Spradlin S. Sridharan F. Stagni M. Stahl S. Stahl P. Stefko S. Stefkova O. Steinkamp S. Stemmle O. Stenyakin M. Stepanova H. Stevens S. Stone B. Storaci S. Stracka M.E. Stramaglia M. Straticiuc U. Straumann L. Sun W. Sutcliffe K. Swientek V. Syropoulos M. Szczekowski T. Szumlak M. Szymanski S. T'Jampens A. Tayduganov T. Tekampe G. Tellarini F. Teubert E. Thomas J. van Tilburg M.J. Tilley V. Tisserand M. Tobin S. Tolk L. Tomassetti D. Tonelli F. Toriello R. Tourinho Jadallah Aoude E. Tournefier M. Traill M.T. Tran M. Tresch A. Trisovic A. Tsaregorodtsev P. Tsopelas A. Tully N. Tuning A. Ukleja A. Usachov A. Ustyuzhanin U. Uwer C. Vacca A. Vagner V. Vagnoni A. Valassi S. Valat G. Valenti R. Vazquez Gomez P. Vazquez Regueiro S. Vecchi M. van Veghel J.J. Velthuis M. Veltri G. Veneziano A. Venkateswaran T.A. Verlage M. Vernet M. Vesterinen J.V. Viana Barbosa B. Viaud D. Vieira M. Vieites Diaz H. Viemann X. Vilasis-Cardona M. Vitti V. Volkov A. Vollhardt B. Voneki A. Vorobyev V. Vorobyev C. Vo{ss} J.A. de Vries C. Vázquez Sierra R. Waldi C. Wallace R. Wallace J. Walsh J. Wang D.R. Ward H.M. Wark N.K. Watson D. Websdale A. Weiden M. Whitehead J. Wicht G. Wilkinson M. Wilkinson M. Williams M.P. Williams T. Williams F.F. Wilson J. Wimberley M.A. Winn J. Wishahi W. Wislicki M. Witek G. Wormser S.A. Wotton K. Wraight K. Wyllie Y. Xie Z. Xu Z. Yang Y. Yao H. Yin J. Yu X. Yuan O. Yushchenko K.A. Zarebski M. Zavertyaev L. Zhang Y. Zhang A. Zhelezov Y. Zheng X. Zhu V. Zhukov J.B. Zonneveld S. Zucchelli
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abstract

A highly significant structure is observed in the $\Lambda_c^+K^-\pi^+\pi^+$ mass spectrum, where the $\Lambda_c^+$ baryon is reconstructed in the decay mode $pK^-\pi^+$. The structure is consistent with originating from a weakly decaying particle, identified as the doubly charmed baryon $\Xi_{cc}^{++}$. The difference between the masses of the $\Xi_{cc}^{++}$ and $\Lambda_c^+$ states is measured to be $1334.94 \pm 0.72 (\mathrm{stat}) \pm 0.27 (\mathrm{syst}~\mathrm{MeV}/c^2$, and the $\Xi_{cc}^{++}$ mass is then determined to be $3621.40 \pm 0.72 (\mathrm{stat}) \pm 0.27 (\mathrm{syst} \pm 0.14 \, (\Lambda_c^+)~\mathrm{MeV}/c^2$, where the last uncertainty is due to the limited knowledge of the $\Lambda_c^+$ mass. The state is observed in a sample of proton-proton collision data collected by the LHCb experiment at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 1.7 $\mathrm{fb}^{-1}$, and confirmed in an additional sample of data collected at 8 TeV.

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