[PDF] Top 20 Sivers function in constituent quark models

... the Sivers function. Besides, in an extreme NR limit, it turns out to be identically zero: in our scheme, it is precisely the interference of the small and large components in the ... Voir le document complet

... 2. CONSTITUENT QUARK MODELS Constituent quark models describe a large variety of observables in baryon spec- ...Any constituent quark model Hamiltonian has a ... Voir le document complet

... the Sivers function in constituent quark ...sizable Sivers effect and the signs for the u and d flavor contributions turn out to be ...effects in the extraction of neutron ... Voir le document complet

... light-front constituent quark model approach (LFCQM), which was used in the past to study leading-twist TMDs, to the description of higher-twist ...model in some sense exhibits features of ... Voir le document complet

... a quark q into a hadron h. In the very recent years, much attention has been devoted to the Sivers function, which was originally proposed to explain the large single-spin asymmetries observed ... Voir le document complet

... The quark models are generally successful in reproducing baryon ...important in describing electro- magnetic or axial form factors of light ...problematic in all potential ... Voir le document complet

... Phenomenological quark models based on chiral symmetry breaking properties, successful in describing low-energy properties of hadrons, are expected to help us understand the connection between DIS ... Voir le document complet

... Therefore, in the MIT bag model, the rôle of each contribution can be followed and ...non-zero Sivers function arises either due the MIT bag wave function or to the 4-spinors of the free ... Voir le document complet

... linear models (such as the structured perceptron) need to define rather complex feature templates to capture interactions between ...weighting function which uses a non-linear hidden layer to automatically ... Voir le document complet

... given in the Appendix. As explained in Ref. [ 4 ] in the case of the Sivers function, we reiterate that, in this approach, it is the inter- ference of the upper and lower ... Voir le document complet

... use constituent quark models to describe the structure of the ...sizable Sivers effect and the signs for the u and d flavor contributions turn out to be ...is in agreement with the one ... Voir le document complet

... symmetric in all its variables when the global parameter a of the model is set to the special value a = ...symmetric models, to models in which there can be lines that carry more than one ... Voir le document complet

... un quark du nucléon de la cible, le générateur utilise des distrèibutions de partons non polarisées fournises par une paramétrisation extérieure, ...un quark d’une certaine saveur portant une fraction ... Voir le document complet

... a function from a learning sample. Developed in the 90s by Vapnik[36] from Learning Theory of Vapnik and Chervonenkis[37], it is considered today as one of the most accurate surrogate ...Gunn[10]. In ... Voir le document complet

... études in vitro ont permis d’identifier les composants de ces encres, et d’en évaluer leur teneur, mais aucune étude in vivo ne permet de quantifier les pigments qui sont introduits dans le ... Voir le document complet

... top quark is the heaviest observed elementary par- ...role in electroweak symmetry breaking. So far, the measured top quark production and decay properties are consistent with pre- dictions of the ... Voir le document complet

... L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignemen[r] ... Voir le document complet

... precisely in the decays of a charged beauty hadron, B + , into a charged kaon, K + , and two charged leptons, ` + ` − ...the quark level the decay involves a b → s ...particles. In the SM description ... Voir le document complet

... measured in situ and bears the largest effect of 13% on the t¯t cross section; and the jet energy scale [24] , which takes into account a 3%-level difference between the recon- structed and generated jet energy ... Voir le document complet

... The Regge slope is here given by 12aQ. However, from experiment we know that the Regge slope for light baryons and light mesons are approximately equal. For light mesons, the exact value in the relativistic flux ... Voir le document complet