نتایج جستجو برای: hadron spin
تعداد نتایج: 139144 فیلتر نتایج به سال:
Strangeness nuclear physics has reached a new era, which requires elevation of phenomenological analyses of hypernuclear phenomena to a deeper understanding of the fundamental interactions from QCD viewpoint. Recent coordinated efforts in experimental and theoretical researches revealed several interesting features of hyperon-nucleon and hyperon-hyperon interactions. For instance, it is establi...
We perform the first simultaneous global QCD analysis of spin-averaged and spin-dependent parton distribution functions (PDFs), including single jet production data from unpolarized polarized hadron collisions. critically assess impact SU(3) flavor symmetry PDF positivity assumptions on quark gluon helicity PDFs, find strong bias these, particularly polarization. The allows for time extraction ...
In this note1 we consider effects of a Two-Photon Exchange (TPE) in inclusive DIS and semi-inclusive DIS (SIDIS). In particular, transverse single spin asymmetries are generated in inclusive DIS if more than one photon is exchanged between the lepton and the hadron. We briefly summarize the TPE in DIS in the parton model and extend our approach to SIDIS, where a new leading twist sin(2φ) contri...
Preliminary results of a mass independent amplitude analysis of J/$ radiative decays into K1? final states are presented. A large component of spin zero is observed at the f2/0(1720) mass region; however, a small spin two component at this mass region cannot be excluded with the present statistics. * Work supported in part by U.S. Department of Energy contracts DE-AC03-76SF00515, DE-AC02-76ER01...
We study effects of the scale invariant hidden sector, unparticle, proposed by Georgi, on top spin correlation at the Large Hadron Collider. Assuming no flavor changing interaction between the unparticles and the Standard Model particles, there arises the top-antitop quark pair production process through virtual unparticle exchanges in the s-channel in addition to the Standard Model processes. ...
To extract information about polarized gluon distribution in the proton, charmed hadron, actually Λc , productions at RHIC experiment are studied. We found that the spin correlation asymmetry between the initial proton and the produced Λc is enable us to distinguish parameterization models of polarized gluons. † Talk presented by K. OHKUMA at 3rd Circum-Pan-Pacific Symposium on “High Energy Spi...
The order αs α mixed QCD and weak corrections to top quark pair production by quark antiquark annihilation are computed, keeping the full dependence on the t and t̄ spins. We determine the contributions to the cross section and to single and double top spin asymmetries at the parton level. These results are necessary ingredients for precise standard model predictions of top quark observables, in...
We have examined the spin structure of the proton in the region of the nucleon resonances (1.085 GeV<W<1.910 GeV) at an average four momentum transfer of Q2=1.3 GeV2. Using the Jefferson Lab polarized electron beam, a spectrometer, and a polarized solid target, we measured the asymmetries A|| and A(perpendicular) to high precision, and extracted the asymmetries A1 and A2, and the spin structure...
The results of a recent calculation of the QCD corrections to the longitudinally polarized Drell-Yan process are summarized. In addition to the parity conserving double spin asymmetry which is already accessible in the Drell-Yan production of lepton pairs at fixed target energies, we consider parity violating single spin asymmetries appearing only in the production of massive vector bosons at p...
Future hadron collider experiments will allow for a detailed investigation of t ¯ t spin correlation effects. In this talk, recent progress in the theoretical description of these effects is reported. In particular, next-to-leading order results for the t ¯ t spin correlations in q ¯ q → t ¯ tX are presented, using various spin quantization axes. Top quark pair production and decay can be descr...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید