For the first time, the reaction gammad-->DeltanK+ has been analyzed in order to search for the exotic pentaquark baryon Theta+(1540). The data were taken at Jefferson Laboratory, using the Hall-B tagged-photon beam of energy between 0.8 and 3.6 GeV and the CEBAF Large Acceptance Spectrometer (CLAS). No statistically significant structures were observed in the nK+ invariant-mass distribution. The upper limit on the gammad-->DeltaTheta+ integrated cross section has been calculated and found to be between 5 and 25 nb, depending on the production model assumed. The upper limit on the differential cross section is also reported.

Niccolai, S

Mirazita, M

Rossi, P

Baltzell, NA

Carman, DS

Hicks, K

McKinnon, B

Mibe, T

Stepanyan, S

Tedeschi, DJ

Adams, G

Ambrozewicz, P

Anefalos Pereira, S

Anghinolfi, M

Asryan, G

Avakian, H

Bagdasaryan, H

Baillie, N

Ball, JP

Batourine, V

Battaglieri, M

Bedlinskiy, I

Bektasoglu, M

Bellis, M

Benmouna, N

Berman, BL

Biselli, AS

Boiarinov, S

Bouchigny, S

Bradford, R

Branford, D

Briscoe, WJ

Brooks, WK

Bültmann, S

Burkert, VD

Butuceanu, C

Calarco, JR

Careccia, SL

Carnahan, B

Chen, S

Cole, PL

Collins, P

Coltharp, P

Crabb, D

Crannell, H

Crede, V

Cummings, JP

Dashyan, N

Degtyarenko, PV

De Masi, R

Deppman, A

De Sanctis, E

Deur, A

Devita, R

Dharmawardane, KV

Djalali, C

Dodge, GE

Donnelly, J

Doughty, D

Dugger, M

Dzyubak, OP

Egiyan, H

Egiyan, KS

El Fassi, L

Elouadrhiri, L

Eugenio, P

Fedotov, G

Feldman, G

Funsten, H

Garçon, M

Gavalian, G

Gilfoyle, GP

Giovanetti, KL

Girod, FX

Goetz, JT

Gonenc, A

Gordon, CIO

Gothe, RW

Griffioen, KA

Guidal, M

Guler, N

Guo, L

Gyurjyan, V

Hadjidakis, C

Hafidi, K

Hakobyan, H

Hakobyan, RS

Hardie, J

Hersman, FW

Hleiqawi, I

Holtrop, Maurik

Hyde-Wright, CE

Ilieva, Y

Ireland, DG

Ishkhanov, BS

Isupov, EL

Ito, MM

Jenkins, D

Jo, HS

Joo, K

Juengst, HG

Kellie, JD

Khandaker, M

Kim, W

Klein, A

Klein, FJ

Klimenko, AV

Kossov, M

Kramer, LH

Kubarovsky, V

Kuhn, J

Kuhn, SE

Kuleshov, SV

Lachniet, J

Langheinrich, J

Lawrence, D

Lee, T

Li, Ji

Livingston, K

Lu, H

MacCormick, M

Markov, N

Mecking, BA

Mellor, J

Melone, JJ

Mestayer, MD

Meyer, CA

Mikhailov, K

Minehart, R

Miskimen, R

Mokeev, V

Morand, L

Morrow, SA

Moteabbed, M

Mutchler, GS

Nadel-Turonski, P

Napolitano, J

Nasseripour, R

Niculescu, G

Niculescu, I

Niczyporuk, BB

Niroula, MR

Niyazov, RA

Nozar, M

de Oliveira Echeimberg, J

Osipenko, M

Ostrovidov, AI

Park, K

Pasyuk, E

Paterson, C

Pierce, J

Pivnyuk, N

Pocanic, D

Pogorelko, O

Pozdniakov, S

Preedom, BM

Price, JW

Prok, Y

Protopopescu, D

Raue, BA

Riccardi, G

Ricco, G

Ripani, M

Ritchie, BG

Ronchetti, F

Rosner, G

Sabatié, F

Salgado, C

Santoro, JP

Sapunenko, V

Schumacher, RA

Serov, VS

Sharabian, YG

Shvedunov, NV

Smith, ES

Smith, LC

Sober, DI

Stavinsky, A

Stepanyan, SS

Stokes, BE

Stoler, P

Strakovsky, II

Strauch, S

Taiuti, M

Thoma, U

Tkabladze, A

Tkachenko, S

Todor, L

Tur, C

Ungaro, M

Vineyard, MF

Vlassov, AV

Watts, DP

Weinstein, LB

Weygand, DP

Williams, M

Wolin, E

Wood, MH

Yegneswaran, A

Zana, L

Zhang, J

Zhao, B

Zhao, Z

CLAS Collaboration

published 

July 21, 2006

General Physics

Physical Review Letters  Journal