تقرير
$\psi(2S)$ and $\Upsilon(3S)$ hadroproduction in the parton Reggeization approach: Yield, polarization, and the role of fragmentation
| العنوان: | $\psi(2S)$ and $\Upsilon(3S)$ hadroproduction in the parton Reggeization approach: Yield, polarization, and the role of fragmentation |
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| المؤلفون: | Kniehl, B. A., Nefedov, M. A., Saleev, V. A. |
| المصدر: | Phys. Rev. D 94, 054007 (2016) |
| سنة النشر: | 2016 |
| المجموعة: | High Energy Physics - Experiment High Energy Physics - Phenomenology |
| مصطلحات موضوعية: | High Energy Physics - Phenomenology, High Energy Physics - Experiment |
| الوصف: | The hadroproduction of the radially excited heavy-quarkonium states $\psi(2S)$ and $\Upsilon(3S)$ at high energies is studied in the parton reggeization approach and the factorization formalism of nonrelativistic QCD at lowest order in the strong-coupling constant $\alpha_s$ and the relative heavy-quark velocity $v$. A satisfactory description of the $\psi(2S)$ transverse-momentum ($p_T$) distributions measured by ATLAS, CMS, and LHCb at center-of-mass energy $\sqrt{S}=7$ TeV is obtained using the color-octet long-distance matrix elements (LDMEs) extracted from CDF data at $\sqrt{S}=1.96$ TeV. The importance of the fragmentation mechanism and the scale evolution of the fragmentation functions in the upper $p_T$ range, beyond 30 GeV, is demonstrated. The $\Upsilon(3S)$ $p_T$ distributions measured by CDF at $\sqrt{S}=1.8$ TeV and by LHCb at $\sqrt{S}=7$ TeV and forward rapidities are well described using LDMEs fitted to ATLAS data at $\sqrt{S}=7$ TeV. Comparisons of polarization measurements by CDF and CMS at large $p_T$ values with our predictions consolidate the familiar problem in the $\psi(2S)$ case, but yield reasonable agreement in the $\Upsilon(3S)$ case. Comment: 28 pages, 12 figures, minor text additions, references added, matches journal version |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevD.94.054007 |
| URL الوصول: | http://arxiv.org/abs/1606.01079 |
| رقم الأكسشن: | edsarx.1606.01079 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevD.94.054007 |
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