π介子、K介子和质子的类时电磁形状因子的精确测量。

Precision measurements of the timelike electromagnetic form factors of pion, kaon, and proton.

作者信息

Pedlar T K, Cronin-Hennessy D, Gao K Y, Gong D T, Hietala J, Kubota Y, Klein T, Lang B W, Li S Z, Poling R, Scott A W, Smith A, Dobbs S, Metreveli Z, Seth K K, Tomaradze A, Zweber P, Ernst J, Arms K, Severini H, Dytman S A, Love W, Mehrabyan S, Mueller J A, Savinov V, Li Z, Lopez A, Mendez H, Ramirez J, Huang G S, Miller D H, Pavlunin V, Sanghi B, Shipsey I P J, Adams G S, Anderson M, Cummings J P, Danko I, Napolitano J, He Q, Muramatsu H, Park C S, Thorndike E H, Coan T E, Gao Y S, Liu F, Artuso M, Boulahouache C, Blusk S, Butt J, Dorjkhaidav O, Li J, Menaa N, Mountain R, Randrianarivony K, Redjimi R, Sia R, Skwarnicki T, Stone S, Wang J C, Zhang K, Csorna S E, Bonvicini G, Cinabro D, Dubrovin M, Lincoln A, Bornheim A, Pappas S P, Weinstein A J, Briere R A, Chen G P, Chen J, Ferguson T, Tatishvili G, Vogel H, Watkins M E, Rosner J L, Adam N E, Alexander J P, Berkelman K, Cassel D G, Duboscq J E, Ecklund K M, Ehrlich R, Fields L, Galik R S, Gibbons L, Gray R, Gray S W, Hartill D L, Heltsley B K, Hertz D, Jones C D, Kandaswamy J, Kreinick D L, Kuznetsov V E, Mahlke-Krüger H, Meyer T O, Onyisi P U E, Patterson J R, Peterson D, Phillips E A, Pivarski J, Riley D, Ryd A, Sadoff A J, Schwarthoff H, Shi X, Shepherd M R, Stroiney S, Sun W M, Wilksen T, Weaver K M, Weinberger M, Athar S B, Avery P, Breva-Newell L, Patel R, Potlia V, Stoeck H, Yelton J, Rubin P, Cawlfield C, Eisenstein B I, Karliner I, Kim D, Lowrey N, Naik P, Sedlack C, Selen M, White E J, Williams J, Wiss J, Asner D M, Edwards K W, Besson D

机构信息

Luther College, Decorah, Iowa 52101, USA.

出版信息

Phys Rev Lett. 2005 Dec 31;95(26):261803. doi: 10.1103/PhysRevLett.95.261803. Epub 2005 Dec 21.

DOI:10.1103/PhysRevLett.95.261803

PMID:16486342

Abstract

Using 20.7 pb(-1) of e(+)e(-) annihilation data taken at sq.rt(r) = 3.671 GeV with the CLEO-c detector, precision measurements of the electromagnetic form factors of the charged pion, charged kaon, and proton have been made for timelike momentum transfer of |Q(2)| = 13.48 GeV(2) by the reaction e(+)e(-) --> h(+)h(-). The measurements are the first ever with identified pions and kaons of |Q(2)| > 4 GeV(2), with the results F(13.48 GeV(2)) = 0.075 +/- 0.008(stat) +/- 0.005(syst) and F(K)(13.48 GeV(2)) = 0.063 +/- 0.004(stat) +/- 0.001(syst). The result for the proton, assuming G(p)(E) = G(p)(M), is G(p)(M)(13.48 GeV(2)) = 0.014 +/- 0.002(stat) +/- 0.001(syst), which is in agreement with earlier results.

摘要

利用在质心能量(\sqrt{s}=3.671) GeV下使用CLEO - c探测器采集的(20.7) pb(^{-1})的(e^{+}e^{-})湮灭数据，通过反应(e^{+}e^{-}\to h^{+}h^{-})，对带电π介子、带电K介子和质子的电磁形状因子在类时动量转移(|Q^{2}| = 13.48) GeV(^{2})时进行了精确测量。这些测量是首次针对(|Q^{2}|>4) GeV(^{2})且已识别出π介子和K介子的情况，结果为(F(13.48) GeV(^{2}) = 0.075\pm0.008)（统计）(\pm0.005)（系统）以及(F_{K}(13.48) GeV(^{2}) = 0.063\pm0.004)（统计）(\pm0.001)（系统）。对于质子，假设(G_{p}(E)=G_{p}(M))，结果为(G_{p}(M)(13.48) GeV(^{2}) = 0.014\pm0.002)（统计）(\pm0.001)（系统），这与早期结果一致。