Search for theΘ+pentaquark in the reactionsγp→K¯0K+nandγp→K¯0K0p
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Search for theΘ+pentaquark in the reactionsγp→K¯0K+nandγp→K¯0K0p

R. De Vita,M. Battaglieri,V. Kubarovsky,N. A. Baltzell,Matthew Bellis,Johnny Goett,L. Guo,G. S. Mutchler,P. Stoler,M. Ungaro,D. P. Weygand,M. J. Amaryan,P. Ambrozewicz,M. Anghinolfi,G. Asryan,H. Avakian,H. Bagdasaryan,N. Baillie,J. P. Ball,V. Batourine,I. Bedlinskiy,N. Benmouna,B. L. Berman,A. S. Biselli,S. Boiarinov,S. Bouchigny,R. Bradford,D. Branford,W. J. Briscoe,W. K. Brooks,S. Bültmann,V. D. Burkert,C. Butuceanu,J. R. Calarco,S. L. Careccia,D. S. Carman,S. Chen,E. Clinton,P. L. Cole,P. Collins,P. Coltharp,D. Crabb,H. Crannell,V. Crede,J. P. Cummings,D. Dale,R. De Masi,E. De Sanctis,P. V. Degtyarenko,A. Deur,K. V. Dharmawardane,C. Djalali,G. E. Dodge,J. Donnelly,D. Doughty,M. Dugger,Oleksandr Dzyubak,H. Egiyan,K. S. Egiyan,L. El Fassi,L. Elouadrhiri,P. Eugenio,G. Fedotov,H. Funsten,M. Y. Gabrielyan,L. Gan,M. Garçon,A. Gasparian,G. Gavalian,G. P. Gilfoyle,K. L. Giovanetti,F. X. Girod,Alexander Glamazdin,J. T. Goetz,E. Golovach,A. Gonenc,C. I. O. Gordon,R. W. Gothe,K. A. Griffioen,M. Guidal,N. Guler,V. Gyurjyan,C. Hadjidakis,K. Hafidi,H. Hakobyan,R. S. Hakobyan,J. Hardie,F. W. Hersman,K. Hicks,I. Hleiqawi,M. Holtrop,C. E. Hyde-Wright,Y. Ilieva,D. G. Ireland,B. S. Ishkhanov,E. L. Isupov,M. M. Ito,D. Jenkins,H. S. Jo,K. Joo,H. G. Juengst,J. D. Kellie,M. Khandaker,W. Kim,A. Klein,F. J. Klein,A. V. Klimenko,M. Kossov,L. H. Kramer,J. Kuhn,S. E. Kuhn,S. V. Kuleshov,J. Lachniet,J. M. Laget,J. Langheinrich,D. Lawrence,T. Lee,Ji Li,K. Livingston,H. Y. Lu,M. MacCormick,Nikolay Markov,B. McKinnon,B. A. Mecking,J. J. Melone,M. D. Mestayer,Curtis Meyer,Tsutomu Mibe,K. Mikhailov,R. Minehart,M. Mirazita,R. Miskimen,Vasilii Mochalov,V. Mokeev,L. Morand,S. A. Morrow,M. Moteabbed,P. Nadel-Turonski,I. Nakagawa,R. Nasseripour,S. Niccolai,G. Niculescu,B. B. Niczyporuk,M. R. Niroula,R. A. Niyazov,M. Nozar,M. Osipenko,A. I. Ostrovidov,K. Park,Eugene Pasyuk,C. Paterson,J. Pierce,N. Pivnyuk,D. Pocanic,O. Pogorelko,S. Pozdniakov,J. W. Price,Y. Prok,D. Protopopescu,B. A. Raue,G. Riccardi,G. Ricco,M. Ripani,B. G. Ritchie,F. Ronchetti,G. Rosner,P. Rossi,Franck Sabatie,C. Salgado,J. P. Santoro,Vladimir Sapunenko,Reinhard Schumacher,V. S. Serov,Y. G. Sharabian,N. V. Shvedunov,E. S. Smith,L. C. Smith,D. I. Sober,A. Stavinsky,S. S. Stepanyan,B. E. Stokes,I. I. Strakovsky,S. Strauch,M. Taiuti,D. J. Tedeschi,A. Teymurazyan,U. Thoma,A. Tkabladze,S. Tkachenko,L. Todor,C. Tur,M. F. Vineyard,A. V. Vlassov,D. P. Watts,L. B. Weinstein,M. Williams,E. Wolin,M. H. Wood,A. Yegneswaran,L. Zana,J. Zhang,B. Zhao,Z. Zhao;R. De Vita;M. Battaglieri;V. Kubarovsky;N. A. Baltzell;Matthew Bellis;Johnny Goett;L. Guo;G. S. Mutchler;P. Stoler;M. Ungaro;D. P. Weygand;M. J. Amaryan;P. Ambrozewicz;M. Anghinolfi;G. Asryan;H. Avakian;H. Bagdasaryan;N. Baillie;J. P. Ball;V. Batourine;I. Bedlinskiy;N. Benmouna;B. L. Berman;A. S. Biselli;S. Boiarinov;S. Bouchigny;R. Bradford;D. Branford;W. J. Briscoe;W. K. Brooks;S. Bültmann;V. D. Burkert;C. Butuceanu;J. R. Calarco;S. L. Careccia;D. S. Carman;S. Chen;E. Clinton;P. L. Cole;P. Collins;P. Coltharp;D. Crabb;H. Crannell;V. Crede;J. P. Cummings;D. Dale;R. De Masi;E. De Sanctis;P. V. Degtyarenko;A. Deur;K. V. Dharmawardane;C. Djalali;G. E. Dodge;J. Donnelly;D. Doughty;M. Dugger;Oleksandr Dzyubak;H. Egiyan;K. S. Egiyan;L. El Fassi;L. Elouadrhiri;P. Eugenio;G. Fedotov;H. Funsten;M. Y. Gabrielyan;L. Gan;M. Garçon;A. Gasparian;G. Gavalian;G. P. Gilfoyle;K. L. Giovanetti;F. X. Girod;Alexander Glamazdin;J. T. Goetz;E. Golovach;A. Gonenc;C. I. O. Gordon;R. W. Gothe;K. A. Griffioen;M. Guidal;N. Guler;V. Gyurjyan;C. Hadjidakis;K. Hafidi;H. Hakobyan;R. S. Hakobyan;J. Hardie;F. W. Hersman;K. Hicks;I. Hleiqawi;M. Holtrop;C. E. Hyde-Wright;Y. Ilieva;D. G. Ireland;B. S. Ishkhanov;E. L. Isupov;M. M. Ito;D. Jenkins;H. S. Jo;K. Joo;H. G. Juengst;J. D. Kellie;M. Khandaker;W. Kim;A. Klein;F. J. Klein;A. V. Klimenko;M. Kossov;L. H. Kramer;J. Kuhn;S. E. Kuhn;S. V. Kuleshov;J. Lachniet;J. M. Laget;J. Langheinrich;D. Lawrence;T. Lee;Ji Li;K. Livingston;H. Y. Lu;M. MacCormick;Nikolay Markov;B. McKinnon;B. A. Mecking;J. J. Melone;M. D. Mestayer;Curtis Meyer;Tsutomu Mibe;K. Mikhailov;R. Minehart;M. Mirazita;R. Miskimen;Vasilii Mochalov;V. Mokeev;L. Morand;S. A. Morrow;M. Moteabbed;P. Nadel-Turonski;I. Nakagawa;R. Nasseripour;S. Niccolai;G. Niculescu;B. B. Niczyporuk;M. R. Niroula;R. A. Niyazov;M. Nozar;M. Osipenko;A. I. Ostrovidov;K. Park;Eugene Pasyuk;C. Paterson;J. Pierce;N. Pivnyuk;D. Pocanic;O. Pogorelko;S. Pozdniakov;J. W. Price;Y. Prok;D. Protopopescu;B. A. Raue;G. Riccardi;G. Ricco;M. Ripani;B. G. Ritchie;F. Ronchetti;G. Rosner;P. Rossi;Franck Sabatie;C. Salgado;J. P. Santoro;Vladimir Sapunenko;Reinhard Schumacher;V. S. Serov;Y. G. Sharabian;N. V. Shvedunov;E. S. Smith;L. C. Smith;D. I. Sober;A. Stavinsky;S. S. Stepanyan;B. E. Stokes;I. I. Strakovsky;S. Strauch;M. Taiuti;D. J. Tedeschi;A. Teymurazyan;U. Thoma;A. Tkabladze;S. Tkachenko;L. Todor;C. Tur;M. F. Vineyard;A. V. Vlassov;D. P. Watts;L. B. Weinstein;M. Williams;E. Wolin;M. H. Wood;A. Yegneswaran;L. Zana;J. Zhang;B. Zhao;Z. Zhao;
physical review d 2006 Vol. 74 pp. 032001-
214
zhao2006physicalsearch

Abstract

The exclusive reactions γp→K¯0K+n and γp→K¯0K0p have been studied in the photon energy range 1.6–3.8 GeV, searching for evidence of the exotic baryon Θ+(1540) in the decays Θ+→nK+ and Θ+→pK0. Data were collected with the CLAS detector at the Thomas Jefferson National Accelerator Facility. The integrated luminosity was about 70 pb−1. The reactions have been isolated by detecting the K+ and proton directly, the neutral kaon via its decay to KS→π+π− and the neutron or neutral kaon via the missing mass technique. The mass and width of known hyperons such as Σ+, Σ− and Λ(1116) were used as a check of the mass determination accuracy and experimental resolution. Approximately 100 000 Λ*(1520)’s and 150 000 ϕ’s were observed in the K¯0K+n and K¯0K0p final state, respectively. No evidence for the Θ+ pentaquark was found in the nK+ or pKS invariant mass spectra. Upper limits were set on the production cross section of the reaction γp→K¯0Θ+ as functions of center-of-mass angle, nK+ and pKS masses. Combining the results of the two reactions, the 95% C.L. upper limit on the total cross section for a resonance peaked at 1540 MeV was found to be 0.7 nb. Within most of the available theoretical models, this corresponds to an upper limit on the Θ+ width, ΓΘ+, ranging between 0.01 and 7 MeV.

Keywords

accuracy neutrons decay baryons hyperons mass spectra photons protons luminosity mesons particle accelerators

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DOI:
10.1103/physrevd.74.032001
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https://sciprofiles.com/publication/view/72c1d0b68...

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