کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5495383 | 1528792 | 2017 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
QCD compositeness as revealed in exclusive vector boson reactions through double-photon annihilation: e+eâ â γγâ â γV0 and e+eâ â γâγâ â V0V0
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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: QCD compositeness as revealed in exclusive vector boson reactions through double-photon annihilation: e+eâ â γγâ â γV0 and e+eâ â γâγâ â V0V0 QCD compositeness as revealed in exclusive vector boson reactions through double-photon annihilation: e+eâ â γγâ â γV0 and e+eâ â γâγâ â V0V0](/preview/png/5495383.png)
چکیده انگلیسی
We study the exclusive double-photon annihilation processes, e+eââγγââγV0 and e+eââγâγââVa0Vb0, where the Vi0 is a neutral vector meson produced in the forward kinematical region: sâ«ât and âtâ«ÎQCD2. We show how the differential cross sections dÏdt, as predicted by QCD, have additional falloff in the momentum transfer squared t due to the QCD compositeness of the hadrons, consistent with the leading-twist fixed-θCM scaling laws, both in terms of conventional Feynman diagrams and by using the AdS/QCD holographic model to obtain the results more transparently. However, even though they are exclusive channels and not associated with the conventional electron-positron annihilation process e+eââγââqq¯, these total cross sections Ï(e+eââγV0) and Ï(e+eââVa0Vb0), integrated over the dominant forward- and backward-θCM angular domains, scale as 1/s, and thus contribute to the leading-twist scaling behavior of the ratio Re+eâ. We generalize these results to exclusive double-electroweak vector-boson annihilation processes accompanied by the forward production of hadrons, such as e+eââZ0V0 and e+eââWâÏ+. These results can also be applied to the exclusive production of exotic hadrons such as tetraquarks, where the cross-section scaling behavior can reveal their multiquark nature.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics Letters B - Volume 764, 10 January 2017, Pages 174-179
Journal: Physics Letters B - Volume 764, 10 January 2017, Pages 174-179
نویسندگان
Stanley J. Brodsky, Richard F. Lebed, Valery E. Lyubovitskij,