کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10723211 | 1033841 | 2010 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Is the nonmonotonic behavior in the cross section of Ï photoproduction near threshold a signature of a resonance?
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موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک هسته ای و انرژی بالا
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Is the nonmonotonic behavior in the cross section of Ï photoproduction near threshold a signature of a resonance? Is the nonmonotonic behavior in the cross section of Ï photoproduction near threshold a signature of a resonance?](/preview/png/10723211.png)
چکیده انگلیسی
We study whether the nonmonotonic behavior found in the differential cross section of the Ï-meson photoproduction near threshold can be described by a resonance. Namely, we add a resonance to a model consisting of Pomeron and (Ï,η) exchange by fiat and see if, with a suitable assignment of spin and parity, mass and width, as well as the coupling constants, one would be able to obtain a good description to all the data reported by the LEPS Collaboration in the low-energy region. The resonant contribution is evaluated by using an effective Lagrangian approach. We find that, with the assumption of a JP=3/2â resonance with mass of 2.10±0.03GeV and width of 0.465±0.141GeV, LEPS data can indeed be well described. The ratio of the helicity amplitudes A12/A32 calculated from the resulting coupling constants differs in sign from that of the known D13(2080). We further find that the addition of this postulated resonance can substantially improve the agreement between the existing theoretical predictions and the recent Ï photoproduction data if a large value of the OZI evading parameter xOZI=12 is assumed for the resonance.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics Letters B - Volume 691, Issue 4, 2 August 2010, Pages 214-218
Journal: Physics Letters B - Volume 691, Issue 4, 2 August 2010, Pages 214-218
نویسندگان
Alvin Kiswandhi, Ju-Jun Xie, Shin Nan Yang,