Hyperon experiments at fermilab

Azimuthal and single spin asymmetries in hard scattering processes

“…The interested reader may fortunately find complete and comprehensive accounts on this subject in Refs. [1,2,9,13]. Whenever possible we will refer to published work.…”

“…(2), where in this case dσ(φ S ) corresponds to (d 6 σ ℓp ↑ →ℓ ′ h+X )/(dx B dy dz h d 2 P T dφ S ), see Eq. (83).…”

“…The rich, low-energy aspects of topics iii) and iv), which may be confronted only with nonperturbative approaches, will also remain uncovered. A comprehensive overview on these subjects and on related topics can be found in several review papers, addressing both their theoretical and experimental aspects [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17]. Here we will focus on the high-energy regime and the treatment in the context of pQCD approaches of transverse SSA's and, marginally, of the transverse polarization of spin 1/2 particles in unpolarized processes.…”

Polarization ofΣ+hyperons produced by 800 GeV/c protons on Cu and Be

“…The dependence of hyperon polarization on the production target material was measured [2,27] for and ÿ hyperons produced by 400 GeV/c protons at 0:6 < p t < 1:9 GeV=c. In that study the production polarization of hyperons was measured for Be and Cu Pb targets.…”

Double Collins effect in e+e−→ΛΛ¯Wang1, Yang2, Lü3 2018Phys. Rev. D9030View full textAdd to dashboardCite

“…Although in the past a lot of experimental data and theoretical analyses have provided information about the Collins functions for pion and kaon mesons, knowledge about the Collins function of the Λ hyperon is much more limited. Meanwhile there is increasing interest in the novel fragmentation mechanism of the Λ hyperon, as it is partly responsible to the observed spin polarization or spin transfer of the spin-1=2 Λ hyperon produced in the high-energy inclusive process [28][29][30][31][32][33][34][35][36]. A T-odd spin-dependent TMD fragmentation D ⊥ 1T ðz; k 2 T Þ, which describes the number density of a transversely polarized Λ hyperon fragmented from an unpolarized quark, is found to play an important role in this aspect and has been studied intensively [1,[37][38][39][40][41][42].…”