Spin Physics at J-PARC

Abstract

Spin-physics projects at J-PARC are explained by including future possibilities. J-PARC is the most-intense hadron-beam facility in the high-energy region above multi-GeV, and spin physics will be investigated by using secondary beams of kaons, pions, neutrinos, muons, and antiproton as well as the primary-beam proton. In particle physics, spin topics are on muon $g-2$, muon and neutron electric dipole moments, and time-reversal violation experiment in a kaon decay. Here, we focus more on hadron-spin physics as for future projects. For example, generalized parton distributions (GPDs) could be investigated by using pion and proton beams, whereas they are studied by the virtual Compton scattering at lepton facilities. The GPDs are key quantities for determining the three-dimensional picture of hadrons and for finding the origin of the nucleon spin including partonic orbital-angular-momentum contributions. In addition, polarized parton distributions and various hadron spin topics should be possible by using the high-momentum beamline. The strangeness contribution to the nucleon spin could be also investigated in principle with the neutrino beam with a near detector facility.

10 pages, LaTeX, 12 eps files, Plenary talk, to be published in International Journal of Modern Physics: Conference Series, Proceedings of the 21st International Symposium on Spin Physics (Spin2014), Beijing, China, October 20-24, 2014

References in corpus (2)

• New analysis concerning the strange quark polarization puzzle
• Novel two-to-three hard hadronic processes and possible studies of generalized parton distributions at hadron facilities

Cited by in corpus (19)

• Possibility to study pentaquark states $P_c(4312),P_c(4440)$, and $P_c(4457)$ in $\gamma p\to J/\psi p$ reaction
• Tensor-polarized structure function $b_1$ in the standard convolution description of the deuteron
• Pion-induced production of hidden-charm pentaquarks $P_c(4312),P_c(4440)$, and $P_c(4457)$
• Theoretical estimate on tensor-polarization asymmetry in proton-deuteron Drell-Yan process
• Antiproton physics
• Potential higher radial excitations in the light pseudoscalar meson family
• Systematic study on production of hidden-bottom pentaquark via $\gamma p$ and ${\pi }^{-}p$ scatterings
• Studying $X(2100)$ hadronic decays and predicting its pion and kaon induced productions
• Double Exotic States Productions in Pion and Kaon Induced Reactions
• Investigation of pion-induced $f_1(1285)$ production off a nucleon target within an interpolating Reggeized approach
• Wigner distributions and GTMDs in a proton using light-front quark-diquark model
• Nuclear transparency of the charged hadron produced in the inclusive electronuclear reaction
• Productions of $f_1(1420)$ in pion and kaon induced reactions
• Intrinsic light and strange quark--antiquark pairs in the proton and nonperturbative strangeness suppression
• $\bar{K}$ induced formation of the $f_0(980)$ and $a_0(980)$ resonances on proton targets
• Color transparency of $K^{+}$ meson produced in the inclusive $(e,e^{\prime })$ reaction on nuclei
• $\Lambda (1405)$ mediated triangle singularity in the $K^{-}d\to p{\Sigma }^{-}$ reaction
• Testing the origin of the "$f_1(1420)$" with the $\bar{K}p\to \Lambda (\Sigma )K\bar{K}\pi$ reaction
• Transparency of the $\gamma (n,p){\pi }^{-}$ reaction in nuclei