SEARCH FOR THE THETA+ PENTAQUARK IN THE REACTION Y D ---> P K- K+ N

McKinnon, B; Hicks, K; Baltzell, Na; Carman, Ds; Mestayer, Md; Mibe, T; Mirazita, Marco; Niccolai, S; Rossi, Patrizia; Stepanyan, S; Tedeschi, Dj; Ambrozewicz, P; Anghinolfi, Marco; Asryan, G; Avakian, H; Bagdasaryan, H; Baillie, N; Ball, Jp; Batourine, V; Battaglieri, Marco; Bedlinskiy, I; Bellis, M; Benmouna, N; Berman, Bl; Biselli, As; Bouchigny, S; Boiarinov, S; Bradford, R; Branford, D; Briscoe, Wj; Brooks, Wk; Bultmann, S; Burkert, Vd; Butuceanu, C; Calarco, Jr; Careccia, Sl; Chen, S; Cole, Pl; Collins, P; Coltharp, P; Crabb, D; Crede, V; Dale, D; De Masi, R; DeVita, R; De Sanctis Enzo,; Degtyarenko, Pv; Deur, A; Djalali, C; Dodge, Ge; Donnelly, J; Doughty, D; Dugger, M; Dzyubak, Op; Egiyan, H; Egiyan, Ks; Elouadrhiri, L; Eugenio, P; Fedotov, G; Feldman, Gerald; Funsten, H; Gabrielyan, M; Gan, L; Garcon, M; Gasparian, A; Gavalian, G; Gilfoyle, Gp; Giovanetti, Kl; Girod, Fx; Goetz, Jt; Gonenc, A; Gothe, Rw; Griffioen, Ka; Guidal, M; Guler, N; Guo, L; Gyurjyan, V; Hakobyan, Rs; Hersman, Fw; Hleiqawi, I; Holtrop, M; Hyde Wright CE,; Ilieva, Y; Ireland, Dg; Ishkhanov, Bs; Ito, Mm; Jenkins, D; Jo, Hs; Joo, K; Juengst, Hg; Kellie, Jd; Khandaker, M; Kim, W; Klein, A; Klein, Fj; Kossov, M; Kramer, Lh; Kubarovsky, V; Kuhn, J; Kuhn, Se; Kuleshov, Sv; Lachniet, J; Langheinrich, J; Lawrence, D; Livingston, K; Lu, H; MacCormick, M; Mecking, Ba; Meyer, Ca; Mikhailov, K; Miskimen, R; Mokeev, V; Morrow, Sa; Moteabbed, M; Mutchler, Gs; Nakagawa, I; Nadel Turonski, P; Nasseripour, R; Niculescu, G; Niculescu, I; Niczyporuk, Bb; Niroula, Mr; Niyazov, Ra; Nozar, M; Osipenko, Mikhail; Ostrovidov, Ai; Park, K; Pasyuk, E; Paterson, C; Pierce, J; Pivnyuk, N; Pogorelko, O; Pozdniakov, S; Price, Jw; Prok, Y; Protopopescu, D; Raue, Ba; Ricco, Giovanni; Ripani, Marco; Ritchie, Bg; Ronchetti, Federico; Rosner, G; Sabatie, F; Salgado Lopez Carlos Alberto,; Santoro, Joseph; Sapunenko, Vladimir; Schumacher, Ra; Serov, Vs; Sharabian, Yg; Smith, Es; Smith, Lc; Sober, Di; Stavinsky, A; Stepanyan, Ss; Stokes, Be; Stoler, P; Strakovsky, Ii; Strauch, S; Taiuti, Mauro Gino; Teymurazyan, A; Thoma, U; Tkabladze, A; Tkachenko, S; Tur, C; Ungaro, M; Vineyard, Mf; Vlassov, Av; Weinstein, Lb; Weygand, Dp; Williams Meurig Crispin Stowe,; Wolin, E; Wood, Mh; Yegneswaran, A; Zana, L; Zhang, J; Zhao, B; Zhao, Z.

doi:10.1103/PhysRevLett.96.212001

A search for the Theta(+) in the reaction gamma d -> pK(-)K(+)n was completed using the CLAS detector at Jefferson Lab. A study of the same reaction, published earlier, reported the observation of a narrow Theta(+) resonance. The present experiment, with more than 30 times the integrated luminosity of our earlier measurement, does not show any evidence for a narrow pentaquark resonance. The angle-integrated upper limit on Theta(+) production in the mass range of 1.52-1.56 GeV/c(2) for the gamma d -> pK(-)Theta(+) reaction is 0.3 nb (95% C.L.). This upper limit depends on assumptions made for the mass and angular distribution of Theta(+) production. Using Lambda(1520) production as an empirical measure of rescattering in the deuteron, the cross section upper limit for the elementary gamma n -> K-Theta(+) reaction is estimated to be a factor of 10 higher, i.e., similar to 3 nb (95% C.L.).

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Titolo:	SEARCH FOR THE THETA+ PENTAQUARK IN THE REACTION Y D ---> P K- K+ N
Autori:	McKinnon B Hicks K Baltzell NA Carman DS Mestayer MD Mibe T Mirazita Marco Niccolai S Rossi Patrizia Stepanyan S Tedeschi DJ Ambrozewicz P Anghinolfi Marco Asryan G Avakian H Bagdasaryan H Baillie N Ball JP Batourine V Battaglieri Marco Bedlinskiy I Bellis M Benmouna N Berman BL Biselli AS Bouchigny S Boiarinov S Bradford R Branford D Briscoe WJ Brooks WK Bultmann S Burkert VD Butuceanu C Calarco JR Careccia SL Chen S Cole PL Collins P Coltharp P Crabb D Crede V Dale D De Masi R DeVita R De Sanctis Enzo Degtyarenko PV Deur A Djalali C Dodge GE Donnelly J Doughty D Dugger M Dzyubak OP Egiyan H Egiyan KS Elouadrhiri L Eugenio P Fedotov G Feldman Gerald Funsten H Gabrielyan M Gan L Garcon M Gasparian A Gavalian G Gilfoyle GP Giovanetti KL Girod FX Goetz JT Gonenc A Gothe RW Griffioen KA Guidal M Guler N Guo L Gyurjyan V Hakobyan RS Hersman FW Hleiqawi I Holtrop M Hyde Wright CE Ilieva Y Ireland DG Ishkhanov BS Ito MM Jenkins D Jo HS Joo K Juengst HG Kellie JD Khandaker M Kim W Klein A Klein FJ Kossov M Kramer LH Kubarovsky V Kuhn J Kuhn SE Kuleshov SV Lachniet J Langheinrich J Lawrence D Livingston K Lu H MacCormick M Mecking BA Meyer CA Mikhailov K Miskimen R Mokeev V Morrow SA Moteabbed M Mutchler GS Nakagawa I Nadel Turonski P Nasseripour R Niculescu G Niculescu I Niczyporuk BB Niroula MR Niyazov RA Nozar M Osipenko Mikhail Ostrovidov AI Park K Pasyuk E Paterson C Pierce J Pivnyuk N Pogorelko O Pozdniakov S Price JW Prok Y Protopopescu D Raue BA RICCO, GIOVANNI Ripani Marco Ritchie BG Ronchetti Federico Rosner G Sabatie F Salgado Lopez Carlos Alberto Santoro Joseph Sapunenko Vladimir Schumacher RA Serov VS Sharabian YG Smith ES Smith LC Sober DI Stavinsky A Stepanyan SS Stokes BE Stoler P Strakovsky II Strauch S TAIUTI, MAURO GINO Teymurazyan A Thoma U Tkabladze A Tkachenko S Tur C Ungaro M Vineyard MF Vlassov AV Weinstein LB Weygand DP Williams Meurig Crispin Stowe Wolin E Wood MH Yegneswaran A Zana L Zhang J Zhao B Zhao Z. mostra contributor esterni nascondi contributor esterni
Data di pubblicazione:	2006
Rivista:	PHYSICAL REVIEW LETTERS
Abstract:	A search for the Theta(+) in the reaction gamma d -> pK(-)K(+)n was completed using the CLAS detector at Jefferson Lab. A study of the same reaction, published earlier, reported the observation of a narrow Theta(+) resonance. The present experiment, with more than 30 times the integrated luminosity of our earlier measurement, does not show any evidence for a narrow pentaquark resonance. The angle-integrated upper limit on Theta(+) production in the mass range of 1.52-1.56 GeV/c(2) for the gamma d -> pK(-)Theta(+) reaction is 0.3 nb (95% C.L.). This upper limit depends on assumptions made for the mass and angular distribution of Theta(+) production. Using Lambda(1520) production as an empirical measure of rescattering in the deuteron, the cross section upper limit for the elementary gamma n -> K-Theta(+) reaction is estimated to be a factor of 10 higher, i.e., similar to 3 nb (95% C.L.).
Handle:	http://hdl.handle.net/11567/270202
Appare nelle tipologie:	01.01 - Articolo su rivista

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