Skip to Main content Skip to Navigation
Journal articles

Search for the $\Theta^+$ pentaquark in the reactions $\gamma p \to \bar K^0K^+n$ and $\gamma p \to \bar K^0K^0p$

R. de Vita M. Battaglieri V. Kubarovsky N.A. Baltzell M. Bellis J. 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 1 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 2 E. de Sanctis P. V. Degtyarenko A. Deur K. V. Dharmawardane C. Djalali G. E. Dodge J. Donnelly D. Doughty M. Dugger O. P. Dzyubak H. Egiyan K. S. Egiyan L. El Fassi L. Elouadrhiri P. Eugenio G. Fedotov H. Funsten M. Y. Gabrielyan L. Gan M. Garçon 2 A. Gasparian G. Gavalian G. P. Gilfoyle K. L. Giovanetti F.X. Girod 2 O. Glamazdin J. T. Goetz E. Golovach A. Gonenc C. I. O. Gordon R. W. Gothe K. A. Griffioen M. Guidal 1 N. Guler V. Gyurjyan C. Hadjidakis 1 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 1 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 2 J. Langheinrich D. Lawrence T. Lee Ji Li K. Livingston H. Y. Lu M. Maccormick 1 N. Markov B. Mckinnon B. A. Mecking J.J. Melone M. D. Mestayer C.A. Meyer T. Mibe K. Mikhailov R. Minehart M. Mirazita R. Miskimen V. Mochalov V. Mokeev L. Morand 2 S.A. Morrow 1, 2 M. Moteabbed P. Nadel-Turonski I. Nakagawa R. Nasseripour S. Niccolai 1 G. Niculescu I. Niculescu B. B. Niczyporuk M. R. Niroula R. A. Niyazov M. Nozar M. Osipenko A. I. Ostrovidov K. Park E. 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 F. Sabatié 2 C. Salgado J. P. Santoro V. Sapunenko R. A. Schumacher V. S. Serov Y. G. Sharabian N. V. Shvedunov E. S. Smith L. C. Smith D. I. Sober A. Stavinsky S.S. Stepanyan 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
Abstract : The exclusive reactions $\gamma p \to \bar K^0 K^+ n$ and $\gamma p \to \bar K^0 K^0 p$ have been studied in the photon energy range 1.6--3.8 GeV, searching for evidence of the exotic baryon $\Theta^+(1540)$ in the decays $\Theta^+\to nK^+$ and $\Theta^+\to p K^0$. 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 $K_S \to \pi^+ \pi^-$ and the neutron or neutral kaon via the missing mass technique. The mass and width of known hyperons such as $\Sigma^+$, $\Sigma^-$ and $\Lambda(1116)$ were used as a check of the mass determination accuracy and experimental resolution. Approximately 100,000 $\Lambda^*(1520)$'s and 150,000 $\phi$'s were observed in the $\bar K^0 K^+ n$ and $\bar K^0 K^0 p$ final state respectively. No evidence for the $\Theta^+$ pentaquark was found in the $nK^+$ or $pK_S$ invariant mass spectra. Upper limits were set on the production cross section of the reaction $\gamma p \to \Theta^+ \bar K^0$ as functions of center-of-mass angle, $nK^+$ and $pK_S$ 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 $\Theta^+$ width, $\Gamma_{\Theta^{+}}$, ranging between 0.01 and 7 MeV.
Document type :
Journal articles
Complete list of metadatas

http://hal.in2p3.fr/in2p3-00105427
Contributor : Dominique Girod <>
Submitted on : Wednesday, October 11, 2006 - 9:56:18 AM
Last modification on : Wednesday, September 16, 2020 - 3:59:37 PM

Links full text

Identifiers

Collections

Citation

R. de Vita, M. Battaglieri, V. Kubarovsky, N.A. Baltzell, M. Bellis, et al.. Search for the $\Theta^+$ pentaquark in the reactions $\gamma p \to \bar K^0K^+n$ and $\gamma p \to \bar K^0K^0p$. Physical Review D, American Physical Society, 2006, 74, pp.032001. ⟨10.1103/PhysRevD.74.032001⟩. ⟨in2p3-00105427⟩

Share

Metrics

Record views

145