Evidence for a narrow baryonic state decaying to K0Sp and K0Sp in deep inelastic scattering at HERA
S. ChekanovArgonne National Laboratory , Argonne , IL 60439-4815 , USAM. DerrickArgonne National Laboratory , Argonne , IL 60439-4815 , USAJ.H. LoizidesAlso affiliated with University College London , London , UKS. MagillArgonne National Laboratory , Argonne , IL 60439-4815 , USAS. MiglioranziArgonne National Laboratory, Argonne, IL 60439-4815, USA4040Supported by the US Department of EnergyB. MusgraveArgonne National Laboratory , Argonne , IL 60439-4815 , USAJ. RepondArgonne National Laboratory , Argonne , IL 60439-4815 , USAR. YoshidaArgonne National Laboratory , Argonne , IL 60439-4815 , USAM.C.K. MattinglyAndrews University, Berrien Springs, MI 49104-0380, USAN. PavelInstitut für Physik der Humboldt-Universität zu Berlin, Berlin, GermanyP. AntonioliG. BariInstitut für Physik der Humboldt-Universität zu Berlin , Berlin , GermanyM. BasileInstitut für Physik der Humboldt-Universität zu Berlin , Berlin , GermanyL. BellagambaInstitut für Physik der Humboldt-Universität zu Berlin , Berlin , GermanyD. BoscheriniInstitut für Physik der Humboldt-Universität zu Berlin , Berlin , GermanyA. BruniG. BruniG. Cara RomeoInstitut für Physik der Humboldt-Universität zu Berlin , Berlin , GermanyL. CifarelliInstitut für Physik der Humboldt-Universität zu Berlin , Berlin , GermanyF. CindoloINFN Bologna , Bologna , ItalyA. ContinM. CorradiS. De PasqualeArgonne National Laboratory, Argonne, IL 60439-4815, USA4040Supported by the US Department of EnergyP. GiustiINFN Bologna , Bologna , ItalyG. IacobucciINFN Bologna , Bologna , ItalyA. MargottiA. MontanariR. NaniaF. PalmonariINFN Bologna , Bologna , ItalyA. PesciINFN Bologna , Bologna , ItalyL. RinaldiINFN Bologna , Bologna , ItalyG. SartorelliA. ZichichiINFN Bologna , Bologna , ItalyG. AghuzumtsyanD. BartschI. BrockS. GoersINFN Bologna , Bologna , ItalyH. HartmannArgonne National Laboratory, Argonne, IL 60439-4815, USA4040Supported by the US Department of EnergyE. HilgerArgonne National Laboratory, Argonne, IL 60439-4815, USA4040Supported by the US Department of EnergyP. IrrgangH.‐P. JakobO. KindUniversity andU. MeyerPhysikalisches Institut der Universität Bonn , Bonn , GermanyE. PaulRetired J. RautenbergINFN Bologna , Bologna , ItalyR. RennerA. StifutkinJ. TandlerPhysikalisches Institut der Universität Bonn , Bonn , GermanyK.C. VossPhysikalisches Institut der Universität Bonn , Bonn , GermanyMeng WangINFN Bologna , Bologna , ItalyD. BaileyPPARC Advanced fellowN. H. BrookJ. E. ColePhysikalisches Institut der Universität Bonn , Bonn , GermanyG.P. HeathPhysics Laboratory , University of Bristol , Bristol , United KingdomT. NamsooPhysics Laboratory , University of Bristol , Bristol , United KingdomS. RobinsPhysics Laboratory , University of Bristol , Bristol , United KingdomM. WingPhysics Laboratory , University of Bristol , Bristol , United KingdomM. CapuaPhysics Department , Calabria University , and INFN , Cosenza , ItalyA. MastroberardinoPhysics Department , Calabria University , and INFN , Cosenza , ItalyM. SchioppaPhysics Department , Calabria University , and INFN , Cosenza , ItalyG. SusinnoPhysics Department , Calabria University , and INFN , Cosenza , ItalyJ.Y. KimChonnam National University , Kwangju , South KoreaI. T. LimChonnam National University , Kwangju , South KoreaK.J. MaPhysics Department , Calabria University , and INFN , Cosenza , ItalyM.Y. PacPhysics Department , Calabria University , and INFN , Cosenza , ItalyM. HelbichChonnam National University , Kwangju , South KoreaY. NingAndrews University, Berrien Springs, MI 49104-0380, USAZ. RenChonnam National University , Kwangju , South KoreaW. B. SchmidkeNevis Laboratories , Columbia University , Irvington on Hudson , NY 10027 , USAF. SciulliNevis Laboratories , Columbia University , Irvington on Hudson , NY 10027 , USAJ. J. ChwastowskiInstitute of Nuclear Physics , Cracow , PolandA. EskreysInstitute of Nuclear Physics , Cracow , PolandJ. FigielInstitute of Nuclear Physics , Cracow , PolandA. GalasInstitute of Nuclear Physics , Cracow , PolandK. OlkiewiczNevis Laboratories , Columbia University , Irvington on Hudson , NY 10027 , USAP. StopaNevis Laboratories , Columbia University , Irvington on Hudson , NY 10027 , USAL. ZawiejskiNevis Laboratories , Columbia University , Irvington on Hudson , NY 10027 , USAL. AdamczykInstitute of Nuclear Physics , Cracow , PolandT. BołdInstitute of Nuclear Physics , Cracow , PolandI. Grabowska-BołdInstitute of Nuclear Physics , Cracow , PolandD. KisielewskaInstitute of Nuclear Physics , Cracow , PolandA.M. KowalInstitute of Nuclear Physics , Cracow , PolandM. KowalNevis Laboratories , Columbia University , Irvington on Hudson , NY 10027 , USAJ. ŁukasikFaculty of Physics and Nuclear Techniques , AGH-University of Science and Technology , Cracow , PolandM. PrzybycieńFaculty of Physics and Nuclear Techniques , AGH-University of Science and Technology , Cracow , PolandL. SuszyckiAGH University of KrakowD. SzubaAGH University of KrakowJ. SzubaFaculty of Physics and Nuclear Techniques , AGH-University of Science and Technology , Cracow , PolandA. KotańskiFaculty of Physics and Nuclear Techniques , AGH-University of Science and Technology , Cracow , PolandW. SłomińskiDepartment of Physics , Jagellonian University , Cracow , PolandV. AdlerDepartment of Physics , Jagellonian University , Cracow , PolandU. BehrensDepartment of Physics , Jagellonian University , Cracow , PolandI. BlochDepartment of Physics , Jagellonian University , Cracow , PolandK. BorrasDepartment of Physics , Jagellonian University , Cracow , PolandV. ChiochiaInstitut für Physik der Humboldt-Universität zu Berlin, Berlin, GermanyD. DannheimNow at Columbia University , NY , USAG. DrewsDepartment of Physics , Jagellonian University , Cracow , PolandJ. FourletovaDepartment of Physics , Jagellonian University , Cracow , PolandU. FrickeDepartment of Physics , Jagellonian University , Cracow , PolandA. GeiserDepartment of Physics , Jagellonian University , Cracow , Poland
2004en
ABI
Аннотация
A resonance search has been made in the K0Sp and K0Sp̄ invariant-mass spectrum measured with the ZEUS detector at HERA using an integrated luminosity of 121 pb−1. The search was performed in the central rapidity region of inclusive deep inelastic scattering at an ep centre-of-mass energy of 300–318 GeV for exchanged photon virtuality, Q2, above 1 GeV2. Recent results from fixed-target experiments give evidence for a narrow baryon resonance decaying to K+n and K0Sp, interpreted as a pentaquark. The results presented here support the existence of such state, with a mass of 1521.5±1.5(stat.)+2.8−1.7(syst.) MeV and a Gaussian width consistent with the experimental resolution of 2 MeV. The signal is visible at high Q2 and, for Q2>20 GeV2, contains 221±48 events. The probability of a similar signal anywhere in the range 1500–1560 MeV arising from fluctuations of the background is below 6×10−5.
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