نتایج جستجو برای: spin asymmetry
تعداد نتایج: 156923 فیلتر نتایج به سال:
We present the first measurement of the cross section and the double longitudinal spin asymmetry of inclusive π0 production in polarized p+p collisions at √ s = 200 GeV at mid-rapidity with the STAR detector, using the barrel electromagnetic calorimeter. The measured cross section is compared to NLO pQCD calculations and can provide constraints on the pion fragmentation functions. Fragmentation...
Very recently, a new measurement of the deuteron spin-dependent structure function g d 1 (x) was reported by the COMPASS group. A main change from the old SMC measurement is a considerable improvement of the statistical accuracy in the low x region 0.004 < x < 0.03. We point out that the new COMPASS data for g d 1 (x) as well as their QCD fits for ∆Σ and ∆s + ∆¯ s are all remarkably close to ou...
We study high-field spin transport in a quantum wire using a semiclassical approach. Spin dephasing (or spin depolarization) in the wire is caused by D’yakonov-Perel’ relaxation associated with bulk inversion asymmetry (Dresselhaus spin-orbit coupling) and structural inversion asymmetry (Rashba spin-orbit coupling). The depolarization rate is found to depend strongly on the initial polarization...
The tunnel magnetoresistance (TMR) of F/O/F magnetic junctions, (F’s are ferromagnetic layers and O is an oxide spacer) in the presence of magnetic impurities within the barrier, is investigated. We assume that magnetic couplings exist both between the spin of impurity and the bulk magnetization of the neighboring magnetic electrode, and between the spin of impurity and the spin of tunneling el...
Sivers asymmetry, adopted to explain transverse single spin asymmetries (SSA) observed in inclusive pion production, p↑ p → πX and p̄↑ p → πX, is used here to compute SSA in Drell-Yan processes; in this case, by considering the differential cross section in the lepton-pair invariant mass, rapidity and transverse momentum, other mechanisms which may originate SSA cannot contribute. Estimates for ...
Sivers asymmetry, adopted to explain transverse single spin asymmetries (SSA) observed in inclusive pion production, p↑ p → πX and p̄↑ p → πX, is used here to compute SSA in Drell-Yan processes; in this case, by considering the differential cross section in the lepton-pair invariant mass, rapidity and transverse momentum, other mechanisms which may originate SSA cannot contribute. Estimates for ...
We calculate the process-independent fragmentation functions for a b̄ antiquark to fragment into longitudinally and transversely polarized B c ( S1) mesons to leading order in the QCD strong coupling constant. In the special case of equal quark mass we recover previous results for the fragmentation of c → ψ and b → Υ. Various spin asymmetry parameters are defined as measures of the relative popu...
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. Longitudinal and transverse spin asymmetries for inclusive jet production at mid-rapidity in polarized p þ p collis...
If signals suggesting supersymmetry (SUSY) are discovered at the LHC then it will be vital to measure the spins of the new particles to demonstrate that they are indeed the predicted super-partners. A method is discussed by which the spins of some of the SUSY particles can be determined. Angular distributions in sparticle decays lead to charge asymmetry in lepton-jet invariant mass distribution...
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