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Evidence for a narrow anti-charmed baryon state

A. Aktas V. Andreev T. Anthonis A. Asmone A. Babaev S. Backovic J. Bahr P. Baranov E. Barrelet W. Bartel S. Baumgartner J. Becker M. Beckingham O. Behnke O. Behrendt A. Belousov Ch. Berger N. Berger T. Berndt J.C. Bizot 1 J. Bohme M.O. Boenig V. Boudry J. Bracinik V. Brisson 1 H.B. Broker D.P. Brown D. Bruncko F.W. Busser A. Bunyatyan G. Buschhorn L. Bystritskaya A.J. Campbell S. Caron F. Cassol-Brunner 2 K. Cerny V. Chekelian C. Collard J.G. Contreras Y.R. Coppens J.A. Coughlan B.E. Cox G. Cozzika J. Cvach J.B. Dainton W.D. Dau K. Daum B. Delcourt 1 R. Demirchyan A. de Roeck K. Desch E.A. de Wolf C. Diaconu 2 J. Dingfelder V. Dodonov A. Dubak C. Duprel G. Eckerlin V. Efremenko S. Egli R. Eichler F. Eisele M. Ellerbrock E. Elsen M. Erdmann W. Erdmann P.J.W. Faulkner L. Favart A. Fedotov R. Felst J. Ferencei M. Fleischer P. Fleischmann Y.H. Fleming G. Flucke G. Flugge A. Fomenko I. Foresti J. Formanek G. Franke G. Frising E. Gabathuler K. Gabathuler E. Garutti J. Garvey J. Gayler R. Gerhards C. Gerlich S. Ghazaryan A. Glazov L. Goerlich N. Gogitidze S. Gorbounov C. Grab H. Grassler T. Greenshaw M. Gregori G. Grindhammer C. Gwilliam D. Haidt L. Hajduk J. Haller M. Hansson G. Heinzelmann R.C.W. Henderson H. Henschel O. Henshaw R. Heremans G. Herrera I. Herynek R.D. Heuer M. Hildebrandt K.H. Hiller P. Hoting D. Hoffmann 2 R. Horisberger A. Hovhannisyan M. Ibbotson M. Ismail M. Jacquet 1 L. Janauschek X. Janssen V. Jemanov L. Jonsson D.P. Johnson H. Jung D. Kant M. Kapichine M. Karlsson J. Katzy N. Keller J. Kennedy I.R. Kenyon C. Kiesling M. Klein C. Kleinwort T. Klimkovich T. Kluge G. Knies A. Knutsson B. Koblitz V. Korbel P. Kostka R. Koutouev A. Kropivnitskaya J. Kroseberg J. Kuckens T. Kuhr M.P.J. Landon W. Lange T. Lastovicka P. Laycock A. Lebedev B. Leissner R. Lemrani V. Lendermann S. Levonian L. Lindfeld K. Lipka B. List E. Lobodzinska N. Loktionova R. Lopez-Fernandez V. Lubimov H. Lueders D. Luke T. Lux L. Lytkin A. Makankine N. Malden E. Malinovski S. Mangano P. Marage J. Marks R. Marshall M. Martisikova H.U. Martyn S.J. Maxfield D. Meer A. Mehta K. Meier A.B. Meyer H. Meyer J. Meyer S. Michine S. Mikocki I. Milcewicz D. Milstead A. Mohamed F. Moreau A. Morozov I. Morozov J.V. Morris M.U. Mozer K. Muller P. Murin V. Nagovizin B. Naroska J. Naumann Th. Naumann P.R. Newman C. Niebuhr A. Nikiforov D. Nikitin G. Nowak M. Nozicka R. Oganezov B. Olivier J.E. Olsson G. Ossoskov D. Ozerov C. Pascaud 1 G.D. Patel M. Peez 2 Emile Perez A. Perieanu A. Petrukhin D. Pitzl R. Placakyte R. Poschl B. Portheault 1 B. Povh N. Raicevic Z. Ratiani P. Reimer B. Reisert A. Rimmer C. Risler E. Rizvi P. Robmann B. Roland R. Roosen A. Rostovtsev Z. Rurikova S. Rusakov K. Rybicki D.P.C. Sankey E. Sauvan 2 S. Schatzel J. Scheins F.P. Schilling P. Schleper S. Schmidt S. Schmitt M. Schneider 2 L. Schoeffel A. Schoning V. Schroder H.C. Schultz-Coulon C. Schwanenberger K. Sedlak F. Sefkow I. Sheviakov L.N. Shtarkov Y. Sirois T. Sloan P. Smirnov Y. Soloviev D. South V. Spaskov A. Specka H. Spitzer R. Stamen B. Stella J. Stiewe I. Strauch U. Straumann V. Tchoulakov G. Thompson P.D. Thompson F. Tomasz D. Traynor P. Truol G. Tsipolitis I. Tsurin J. Turnau E. Tzamariudaki A. Uraev Martin Urban A. Usik D. Utkin S. Valkar A. Valkarova C. Vallee 2 P. van Mechelen N. van Remortel A. Vargas Trevino Y. Vazdik C. Veelken A. Vest S. Vinokurova V. Volchinski K. Wacker J. Wagner G. Weber R. Weber D. Wegener C. Werner N. Werner M. Wessels B. Wessling G.G. Winter Ch. Wissing E.E. Woehrling R. Wolf E. Wunsch S. Xella W. Yan V. Yeganov J. Zacek J. Zalesak Zhiqing Zhang A. Zhokin H. Zohrabyan F. Zomer 1
Abstract : A narrow resonance in D*- p and D*+ pbar invariant mass combinations is observed in inelastic electron-proton collisions at centre-of-mass energies of 300 GeV and 320 GeV at HERA. The resonance has a mass of 3099 \pm 3 (stat.) \pm 5 (syst.) MeV and a measured Gaussian width of 12 \pm 3 (stat.) MeV, compatible with the experimental resolution. The resonance is interpreted as an anti-charmed baryon with a minimal constituent quark composition of uuddcbar, together with the chA narrow resonance in D*- p and D*+ pbar invariant mass combinations is observed in inelastic electron-proton collisions at centre-of-mass energies of 300 GeV and 320 GeV at HERA. The resonance has a mass of 3099 \pm 3 (stat.) \pm 5 (syst.) MeV and a measured Gaussian width of 12 \pm 3 (stat.) MeV, compatible with the experimental resolution. The resonance is interpreted as an anti-charmed baryon with a minimal constituent quark composition of uuddcbar, together with the charge conjugate.
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A. Aktas, V. Andreev, T. Anthonis, A. Asmone, A. Babaev, et al.. Evidence for a narrow anti-charmed baryon state. Physics Letters B, Elsevier, 2004, 588, pp.17-28. ⟨in2p3-00022141⟩

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