Weak K → π generalized form factors and transverse transition quark-spin density from the instanton vacuum

Son, Hyeon-Dong (Department of Physics, Inha University, Incheon, 402-751, Republic of Korea) ; Nam, Seung-il (Department of Physics, Pukyong National University, Busan, 608-737, Republic of Korea) ; Kim, Hyun-Chul  (Department of Physics, Inha University, Incheon, 402-751, Republic of Korea) (School of Physics, Korea Institute for Advanced Study (KIAS), Seoul, 130-722, Republic of Korea) (Research Center for Nuclear Physics (RCNP), Osaka University, Ibaraki, Osaka, 567-0047, Japan)

16 June 2015

Abstract: We investigate the generalized K→π transition vector and tensor form factors, from which we derive the transverse quark spin density in the course of the K→π transition, based on the nonlocal chiral quark model from the instanton vacuum. The results of the transition tensor form factor are in good agreement with recent data of lattice QCD. The behavior of the transverse quark spin density of the K→π transition turns out to be very similar to those of the pion and the kaon.


Published in: Physics letters B (2015)
Published by: Elsevier
DOI: 10.1016/j.physletb.2015.06.036
License: CC-BY-3.0



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