نتایج جستجو برای: hadron spin
تعداد نتایج: 139144 فیلتر نتایج به سال:
We examine pair mass dependence near threshold as a means to measure the spin of the top quark in hadron collisions, and we discuss the possibility that a top squark signal could be hidden among the top events.
We study the fragmentation of a transversely polarized quark into a non collinear (k⊥ 6= 0) spinless hadron and the fragmentation of an unpolarized quark into a non collinear transversely polarized spin 1/2 baryon. These nonperturbative properties are described by spin and k⊥ dependent fragmentation functions and are revealed in the observation of single spin asymmetries. Recent data on the pro...
The Sivers effect in polarized SIDIS can be measured in two hadron production as sine modulations involving the azimuthal angles φT and φR of both the total and the relative transverse momenta of the hadron pair, complementary to the conventional single hadron studies. In this talk we briefly present the results obtained in our recent work [1] and [2]. We also present the leading order parton m...
We study the fragmentation of a transversely polarized quark into a non collinear (k⊥ 6= 0) spinless hadron and the fragmentation of an unpolarized quark into a non collinear transversely polarized spin 1/2 baryon. These nonperturbative properties are described by spin and k⊥ dependent fragmentation functions and are revealed in the observation of single spin asymmetries. Recent data on the pro...
We present a model calculation of transverse momentum dependent (TMD) gluon fragmentation functions for the spin-1/2 and spin-0 hadrons. The is based on assumption that time-like off-shell can fragments into hadron single spectator particle. So far such models have only been used to calculate TMD distribution quark gluons. gluon-hadron-spectator coupling described by an effective vertex contain...
We report the first measurement of the transverse momentum dependence of double-spin asymmetries in semi-inclusive production of pions in deep-inelastic scattering off the longitudinally polarized proton. Data have been obtained using a polarized electron beam of 5.7 GeV with the CLAS detector at the Jefferson Lab (JLab). Modulations of single spin asymmetries over the azimuthal angle between l...
New experimental data on medium to heavy single Λ hypernuclei revealed a much larger spin-orbit splitting than observed in older measurements of light hypernuclei. Taking into account particle threshold effects and the density-dependence of inmedium coupling constants the apparent suppression of spin-orbit strength in light hypernuclei as well as the spin-orbit structure observed in medium to h...
On the basis of the correspondence principle between the relativistic moving medium electrodynamics and relativistic quantum field theory the covari-ant Lagrangian of the electromagnetic field interaction with the polarized spin particles have been obtained. This Lagrangian satisfies the main relativistic quantum field theory requirements and contains four independent covariant spin structures,...
The quantum field theory describing the Electroweak sector demands some new physics at the TeV scale in order to unitarize the scattering of longitudinal W bosons. If this new physics takes the form of a scalar Higgs boson then it is hard to understand the huge hierarchy of scales between the Electroweak scale ∼ TeV and the Planck scale ∼ 10 GeV. This is known as the Naturalness problem. Normal...
Two–spin asymmetries A π 0 LL are calculated for various types of spin–dependent gluon distributions. It is concluded that the E581/704 data on A π 0 LL do not necessarily rule out the large gluon polarization but restrict severely the x dependence of its distribution. Moreover, A J/ψ LL are calculated for the forthcoming test of spin–dependent gluon distributions. The advent of so–called " the...
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