Distribution Amplitudes of K and ϕ at the Physical Pion Mass from Lattice QCD

We present the first lattice QCD calculation of the distribution amplitudes of longitudinally and transversely polarized vector mesons K ∗ and ϕ using large momentum effective theory. We use the clover fermion action on three ensembles with 2 + 1 + 1 flavors of highly improved staggered quarks actio...

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Bibliographic Details
Published in:Physical review letters 2021-08, Vol.127 (6), p.062002-062002, Article 062002
Main Authors: Hua, Jun, Chu, Min-Huan, Sun, Peng, Wang, Wei, Xu, Ji, Yang, Yi-Bo, Zhang, Jian-Hui, Zhang, Qi-An
Format: Article
Language:English
Subjects:
Amplitudes
Asymptotic properties
Fermions
Flavor (particle physics)
Momentum
Pions
Quantum chromodynamics
Vector mesons
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Summary:We present the first lattice QCD calculation of the distribution amplitudes of longitudinally and transversely polarized vector mesons K ∗ and ϕ using large momentum effective theory. We use the clover fermion action on three ensembles with 2 + 1 + 1 flavors of highly improved staggered quarks action, generated by the MIMD Lattice Computation Collaboration, at physical pion mass and { 0.06 , 0.09 , 0.12 } fm lattice spacings and choose three different hadron momenta Pz = { 1.29 , 1.72 , 2.15 } GeV . The resulting lattice matrix elements are nonperturbatively renormalized in a recently proposed hybrid scheme. An extrapolation to the continuum and infinite momentum limit is carried out. We find that, while the longitudinal distribution amplitudes tend to be close to the asymptotic form, the transverse ones deviate rather significantly from the asymptotic form. Our final results provide crucial ab initio theory inputs for analyzing pertinent exclusive processes.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.127.062002