Neutron Spin Sum Rules and Spin Polarizabilities at Low Q2
نویسنده
چکیده
izabilities have been formed. These proceedings will concentrate on recent measurments on the neutron via a polarized 3He target in the low Q2 region. In particular, experiment E97-110 was performed in Hall A to study the neutron and 3He spin structure at four-momentum transfers between 0.02 and 0.3 GeV2. This Q2 range allows us to make a benchmark-check of Chiral Perturbation Theory calculations. Previous results for the spin polarizabilities down to 0.1 GeV2 have
منابع مشابه
ar X iv : 0 90 7 . 14 75 v 1 [ nu cl - e x ] 9 J ul 2 00 9 Spin Sum Rules at Low Q
Recent precision spin-structure data from Jefferson Lab have significantly advanced our knowledge of nucleon structure at low Q2. Results on the neutron spin sum rules and polarizabilities in the low to intermediate Q2 region are presented. The Burkhardt-Cuttingham Sum Rule was verified within experimental uncertainties. When comparing with theoretical calculations, results on spin polarizabili...
متن کاملJefferson Lab’s results on the Q2-evolution of moments of spin structure functions
We present the recent JLab measurements on moments of spin structure functions at intermediate and low Q2. The Bjorken sum and Burkhardt-Cottingham sum on the neutron are presented. The later appears to hold. Higher moments (generalized spin polarizabilities and dn 2) are shown and compared to chiral perturbation theory and lattice QCD respectively.
متن کاملBurkhardt-Cottingham sum rule and forward spin polarizabilities in Heavy Baryon Chiral Perturbation Theory
We study spin-dependent sum rules for forward virtual Compton scattering (VVCS) off the nucleon in heavy baryon chiral perturbation theory (HBChPT) at order O(p4). We show how these sum rules can be evaluated from low energy expansions (in the virtual photon energy) of the forward VVCS amplitude. We study in particular the Burkhardt-Cottingham sum rule in HBChPT and the higher terms in the low ...
متن کاملSpin Sum Rules and Polarizabilities: Results from Jefferson Lab
The nucleon spin structure has been an active, exciting and intriguing subject of interest for the last three decades. Recent experimental data on nucleon spin structure at low to intermediate momentum transfers provide new information in the confinement regime and the transition region from the confinement regime to the asymptotic freedom regime. New insight is gained by exploring moments of s...
متن کاملSPIN-DEPENDENT TWIST–FOUR MATRIX ELEMENTS FROM g1 DATA IN THE RESONANCE REGION
Matrix elements of spin-dependent twist-four operators are extracted from recent data on the spin-dependent g1 structure function of the proton and deuteron in the resonance region. We emphasize the need to include the elastic contributions to the first moments of the structure functions at Q2 < 2 GeV2. The coefficients of the 1/Q2 corrections to the Ellis-Jaffe sum rules are found to be 0.04± ...
متن کامل