نتایج جستجو برای: lepton
تعداد نتایج: 9322 فیلتر نتایج به سال:
A bstract We study a few basic photon- and lepton-initiated processes at the LHC which can be computed using recently developed photon lepton parton densities. First, we consider production of massive scalar particle initiated by lepton-antilepton annihilation photon-photon fusion as representative examples searches exotic particles. Then lepton-lepton scattering, since this Standard-Model proc...
We construct phenomenological quark-lepton mass matrices based on S 3 permutation symmetry in a manner fully compatible with SU(5) grand unification. The Higgs particles we need are 5, 45 and their conjugates. The model gives a charge −1/3 quark vs charged lepton mass relation, and also a good fit to mass-mixing relations for the quark sector, as well as an attractive mixing pattern for the lep...
In the gauge-mediated supersymmetry breaking models with scalar tau as the next-to-lightest supersymmetric particle, a scalar lepton may decay dominantly into its superpartner, tau lepton, and the lightest scalar tau particle through l̃ → lτ±τ̃ 1 . We give detailed formulas for the three-body decay amplitudes and the polarization asymmetry of the outgoing tau lepton . We find that the tau polariz...
Heavy singlet neutrinos admit Majorana masses which are not possible for the Standard Model particles. This suggest new possibilities for generating the masses and mixing angles of light neutrinos. We present a model of neutrino physics which combines the source of lepton number violation with the flavor symmetry responsible for the hierarchy in the charged lepton and quark sector. This is acco...
The PHENIX experiment at the Relativistic Heavy Ion Collider has measured single electrons at midrapidity and single muons at forward and backward rapidities (1.2 < |y| < 2.2) for p+p and d+Au collisions at √ s N N = 200 GeV. The inclusive lepton spectra exhibit excesses over light hadron sources. The excesses are attributed to semileptonic decays of charm and bottom hadrons and compared to the...
On considère la diffusion inélastique de leptons polarisés longitudinalement sur des nucléons polarisés. On note m la masse du lepton , k (k) la 4impulsion du lepton initial (final) et s (s) son 4-vecteur spin covariant , tel que s ·k = 0 (s ·k′ = 0) et s ·s = −1 (s ·s′ = −1); la masse du nucléon est M , sa 4-impulsion et son spin sont P et S. On suppose la dominance de l’échange d’unseul photo...
We investigate the role of the flavor asymmetry of the nucleon's polarized antiquark distributions in Drell–Yan lepton pair production in polarized nucleon–nucleon collisions at HERA (fixed–target) and RHIC energies. It is shown that the large polarized antiquark flavor asymmetry predicted by model calculations in the large–N c limit (chiral quark–soliton model) has a dramatic effect on the dou...
We present a search for ten baryon-number violating decay modes of Λ hyperons using the CLAS detector at Jefferson Laboratory. Nine of these decay modes result in a single meson and single lepton in the final state (Λ → mm) and conserve either the sum or the difference of baryon and lepton number (B ± L). The tenth decay mode (Λ → ¯ pπ +) represents a difference in baryon number of two units an...
We discuss the implications for lepton mixing and CP violation of structure in the lepton mass matrices, for the case that neutrino masses are generated by the see-saw mechanism with an hierarchical structure for the Majorana masses. For a particularly interesting case with enhanced symmetry in which the lepton Dirac mass matrices are related to those in the quark sector, the CHOOZ angle is nea...
We present a model of the lepton masses and flavor mixing based on the discrete group S 4 ⊗Z 2. In this model, all the charged leptons and neutrinos are assigned to the 3 α representation of S 4 in the Yamanouchi bases. The charged lepton and neutrino masses are mainly determined by the vacuum expectation value structures of the Higgs fields. Our model predicts a nearly tri-bimaximal lepton fla...
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