تقرير
Scaling properties of inclusive W$^\pm$ production at hadron colliders
| العنوان: | Scaling properties of inclusive W$^\pm$ production at hadron colliders |
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| المؤلفون: | Arleo, François, Chapon, Émilien, Paukkunen, Hannu |
| سنة النشر: | 2015 |
| المجموعة: | High Energy Physics - Experiment High Energy Physics - Phenomenology Nuclear Experiment Nuclear Theory |
| مصطلحات موضوعية: | High Energy Physics - Phenomenology, High Energy Physics - Experiment, Nuclear Experiment, Nuclear Theory |
| الوصف: | We consider the hadroproduction of W gauge bosons in their leptonic decay mode. Starting from the leading-order expressions, we show that by defining a suitable scaling variable the centre-of-mass dependence of the cross sections at the LHC energies can be essentially described by a simple power law. The scaling exponent is directly linked to the small-$x$ behaviour of parton distribution functions (PDF) which, at the high virtualities involved in W production, is largely dictated by QCD evolution equations. This entails a particularly simple scaling law for the lepton charge asymmetry and also predicts that measurements in different collision systems (p-p, p-$\bar{\rm p}$, p-Pb Pb-Pb) are straightforwardly related. The expectations are compared with the existing data and a very good overall agreement is observed. It is shown that the PDF uncertainty in certain cross-section ratios between nearby centre-of-mass energies can be significantly reduced by taking the ratios at fixed value of scaling variable instead of fixed rapidity. Comment: The version to appear in EPJC, references updated in v3 |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1140/epjc/s10052-016-4049-1 |
| URL الوصول: | http://arxiv.org/abs/1509.03993 |
| رقم الأكسشن: | edsarx.1509.03993 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1140/epjc/s10052-016-4049-1 |
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