کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1840741 1031235 2013 16 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
J/ψ+χcJJ/ψ+χcJ production at the B factories under the principle of maximum conformality
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه ریاضیات فیزیک ریاضی
پیش نمایش صفحه اول مقاله
J/ψ+χcJJ/ψ+χcJ production at the B factories under the principle of maximum conformality
چکیده انگلیسی

Under the conventional scale setting, the renormalization scale uncertainty usually constitutes a systematic error for a fixed-order perturbative QCD estimation. The recently suggested principle of maximum conformality (PMC) provides a principle to eliminate such scale ambiguity in a step-by-step way. Using the PMC, all non-conformal terms in perturbative expansion series are summed into the running coupling, and one obtains a unique, scale-fixed, scheme-independent prediction at any finite order. In the paper, we make a detailed PMC analysis for both the polarized and the unpolarized cross sections for the double charmonium production process, e++e−→J/ψ(ψ′)+χcJe++e−→J/ψ(ψ′)+χcJ with (J=0,1,2)(J=0,1,2). The running behavior for the coupling constant, governed by the PMC scales, are determined exactly for the specific processes. We compare our predictions with the measurements at the B   factories, BaBar and Belle, and the theoretical estimations obtained in the literature. Because the non-conformal terms are different for various polarized and unpolarized cross sections, the PMC scales of these cross sections are different in principle. It is found that all the PMC scales are almost independent of the initial choice of renormalization scale. Thus, the large renormalization scale uncertainty usually adopted in the literature up to ∼40%∼40% at the NLO level, obtained from the conventional scale setting, for both the polarized and the unpolarized cross sections are greatly suppressed. It is found that the charmonium production is dominated by J=0J=0 channel. After PMC scale setting, we obtain σ(J/ψ+χc0)=12.25−3.13+3.70 fb and σ(ψ′+χc0)=5.23−1.32+1.56 fb, where the squared average errors are caused by bound state parameters as mcmc, |RJ/ψ(0)||RJ/ψ(0)| and |RχcJ′(0)|, which are non-perturbative error sources in different to the QCD scale setting problem. In comparison to the experimental data, a more accurate theoretical estimation shall be helpful for a precise testing of QCD and for determining whether there is new physics beyond the Standard Model.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Physics B - Volume 876, Issue 3, 21 November 2013, Pages 731–746
نویسندگان
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