Battaglieri M, De Vita R, Kubarovsky V, Guo L, Mutchler G S, Stoler P, Weygand D P, Ambrozewicz P, Anghinolfi M, Asryan G, Avakian H, Bagdasaryan H, Baillie N, Ball J P, Baltzell N A, Batourine V, Bedlinskiy I, Bellis M, Benmouna N, Berman B L, Biselli A S, Bouchigny S, Boiarinov S, Bradford R, Branford D, Briscoe W J, Brooks W K, Bültmann S, Burkert V D, Butuceanu C, Calarco J R, Careccia S L, Carman D S, Chen S, Clinton E, Cole P L, Coltharp P, Crabb D, Crannell H, Cummings J P, Dale D, De Sanctis E, Degtyarenko P V, Deur A, Dharmawardane K V, Djalali C, Dodge G E, Donnelly J, Doughty D, Dugger M, Dzyubak O P, Egiyan H, Egiyan K S, Elouadrhiri L, Eugenio P, Fedotov G, Funsten H, Gabrielyan M Y, Gan L, Garçon M, Gasparian A, Gavalian G, Gilfoyle G P, Giovanetti K L, Girod F X, Glamazdin O, Goett J, Goetz J T, Golovach E, Gonenc A, Gordon C I O, Gothe R W, Griffioen K A, Guidal M, Guler N, Gyurjyan V, Hadjidakis C, Hakobyan R S, Hardie J, Hersman F W, Hicks K, Hleiqawi I, Holtrop M, Hyde-Wright C E, Ilieva Y, Ireland D G, Ishkhanov B S, Ito M M, Jenkins D, Jo H S, Joo K, Juengst H G, Kellie J D, Khandaker M, Kim W, Klein A, Klein F J, Klimenko A V, Kossov M, Kramer L H, Kuhn J, Kuhn S E, Kuleshov S V, Lachniet J, Laget J M, Langheinrich J, Lawrence D, Lee T, Li Ji, Livingston K, McKinnon B, Mecking B A, Melone J J, Mestayer M D, Meyer C A, Mibe T, Mikhailov K, Minehart R, Mirazita M, Miskimen R, Mochalov V, Mokeev V, Morand L, Morrow S A, Nadel-Turonski P, Nakagawa I, Nasseripour R, Niccolai S, Niculescu G, Niculescu I, Niczyporuk B B, Niyazov R A, Nozar M, Osipenko M, Ostrovidov A I, Park K, Pasyuk E, Paterson C, Pierce J, Pivnyuk N, Pocanic D, Pogorelko O, Pozdniakov S, Price J W, Prok Y, Protopopescu D, Raue B A, Riccardi G, Ricco G, Ripani M, Ritchie B G, Ronchetti F, Rosner G, Rossi P, Sabatié F, Salgado C, Santoro J P, Sapunenko V, Schumacher R A, Serov V S, Sharabian Y G, Smith E S, Smith L C, Sober D I, Stavinsky A, Stepanyan S S, Stepanyan S, Stokes B E, Strakovsky I I, Strauch S, Taiuti M, Tedeschi D J, Teymurazyan A, Thoma U, Tkabladze A, Tkachenko S, Todor L, Tur C, Ungaro M, Vineyard M F, Vlassov A V, Weinstein L B, Williams M, Wolin E, Wood M H, Yegneswaran A, Zana L, Zhang J, Zhao B
Istituto Nazionale di Fisica Nucleare, Sezione di Genova, and Dipartimento di Fisica, Universitá di Genova, 16146 Genova, Italy.
Phys Rev Lett. 2006 Feb 3;96(4):042001. doi: 10.1103/PhysRevLett.96.042001. Epub 2006 Jan 31.
The exclusive reaction gammap-->K0K+n was studied in the photon energy range between 1.6 and 3.8 GeV searching for evidence of the exotic baryon Theta+ (1540)-->nK+. The decay to nK+requires the assignment of strangeness S=+1 to any observed resonance. Data were collected with the CLAS detector at the Thomas Jefferson National Accelerator Facility corresponding to an integrated luminosity of 70 pb-1. No evidence for the Theta+ pentaquark was found. Upper limits were set on the production cross section as function of center-of-mass angle and nK+ mass. The 95% C.L. upper limit on the total cross section for a narrow resonance at 1540 MeV was found to be 0.8 nb.
在1.6至3.8 GeV的光子能量范围内研究了排他性反应γp→K⁰K⁺n，以寻找奇异重子Θ⁺（1540）→nK⁺的证据。衰变到nK⁺要求将奇异数S = +1赋予任何观测到的共振态。使用托马斯·杰斐逊国家加速器设施的CLAS探测器收集数据，对应积分亮度为70 pb⁻¹。未发现Θ⁺五夸克的证据。设定了产生截面作为质心角和nK⁺质量函数的上限。发现1540 MeV窄共振态的总截面在95%置信水平下的上限为0.8 nb。
