在专属反应γp→K⁺K⁻p中寻找Θ⁺⁺五夸克态。
Search for Theta++ pentaquarks in the exclusive reaction gammap-->K+K-p.
作者信息
Kubarovsky V, Battaglieri M, De Vita R, Goett J, 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, Collins P, Coltharp P, Crabb D, Crannell H, Crede V, Cummings J P, De Masi R, 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, 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, Hafidi K, 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, Isupov E L, 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, Lu H, MacCormick M, Markov N, 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, Moteabbed M, Nadel-Turonski P, Nakagawa I, Nasseripour R, Niccolai S, Niculescu G, Niculescu I, Niczyporuk B B, Niroula M R, 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, Shvedunov N V, 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
机构信息
Rensselaer Polytechnic Institute, Troy, New York 12180-3590, USA.
出版信息
Phys Rev Lett. 2006 Sep 8;97(10):102001. doi: 10.1103/PhysRevLett.97.102001. Epub 2006 Sep 7.
The reaction gammap --> pK+K- was studied at Jefferson Lab with photon energies from 1.8 to 3.8 GeV using a tagged photon beam. The goal was to search for a Theta++ pentaquark, a narrow, doubly charged baryon state having strangeness S=+1 and isospin I=1, in the pK+ invariant mass spectrum. No statistically significant evidence of a Theta++ was found. Upper limits on the total and differential cross section for the reaction gammap --> K-Theta++ were obtained in the mass range from 1.5 to 2.0 GeV/c2, with an upper limit for a narrow resonance with a mass M(Theta++) = 1.54 GeV/c2 of about 0.15 nb, 95% C.L.. This result places a stringent upper limit on the Theta++ width Gamma(Theta++) <0.1 MeV/c2.
利用标记光子束在杰斐逊实验室对反应γp→pK⁺K⁻进行了研究，光子能量范围为1.8至3.8 GeV。目的是在pK⁺不变质量谱中寻找Θ⁺⁺五夸克，这是一种窄的、双重带电的重子态，奇异数S = +1，同位旋I = 1。未发现具有统计显著性的Θ⁺⁺证据。在1.5至2.0 GeV/c²的质量范围内获得了反应γp→K⁻Θ⁺⁺的总截面和微分截面的上限，对于质量M(Θ⁺⁺) = 1.54 GeV/c²的窄共振，其上限约为0.15 nb，置信水平为95%。该结果对Θ⁺⁺的宽度Γ(Θ⁺⁺) < 0.1 MeV/c²给出了严格的上限。
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