کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10721930 | 1033653 | 2011 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Determination of the η-transition form factor in the γpâpηâpγe+eâ reaction
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک هسته ای و انرژی بالا
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Determination of the η-transition form factor in the γpâpηâpγe+eâ reaction Determination of the η-transition form factor in the γpâpηâpγe+eâ reaction](/preview/png/10721930.png)
چکیده انگلیسی
The Dalitz decay ηâγe+eâ has been measured using the combined Crystal Ball and TAPS photon detector setup at the electron accelerator MAMI-C. Compared to the most recent transition form-factor measurement in the e+eâ channel, statistics have been improved by one order of magnitude. The e+eâ invariant mass distribution shows a deviation from the QED prediction for a point-like particle, which can be described by a form-factor. Using the usual monopole transition form-factor parameterization, F(m2)=(1âm2/Î2)â1, a value of Îâ2=(1.92±0.35(stat)±0.13(syst)) GeVâ2 has been determined. This value is in good agreement with a recent measurement of the η Dalitz decay in the μ+μâ channel and with recent form-factor calculations. An improved value of the branching ratio BR(ηâγe+eâ)=(6.6±0.4(stat)±0.4(syst))â
10â3 has been determined.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics Letters B - Volume 701, Issue 5, 27 July 2011, Pages 562-567
Journal: Physics Letters B - Volume 701, Issue 5, 27 July 2011, Pages 562-567
نویسندگان
H. Berghäuser, V. Metag, A. Starostin, P. Aguar Bartolomé, L.K. Akasoy, J.R.M. Annand, H.J. Arends, K. Bantawa, R. Beck, V. Bekrenev, A. Braghieri, D. Branford, W.J. Briscoe, J. Brudvik, S. Cherepnya, B.T. Demissie, E.J. Downie, P. Drexler, F. Zehr,