Bali, Gunnar S. and Braun, Vladimir M. and Buerger, Simon and Goeckeler, Meinulf and Gruber, Michael and Hutzler, Fabian and Korcyl, Piotr and Schaefer, Andreas and Sternbeck, Andre and Wein, Philipp (2019) Light-cone distribution amplitudes of pseudoscalar mesons from lattice QCD. JOURNAL OF HIGH ENERGY PHYSICS (8): 065. ISSN 1029-8479,
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We present the first lattice determination of the two lowest Gegenbauer moments of the leading-twist pion and kaon light-cone distribution amplitudes with full control of all errors: a(2)(pi) = 0.101(-24)(+24) for the pion; a(1)(K) = 0.0533(-34)(+34) and a(2)(K) = 0.090(-19)(+19) for the kaon. The calculation is carried out on 35 different CLS ensembles with N-f = 2 + 1 flavors of dynamical Wilson-clover fermions. These cover a multitude of pion and kaon mass combinations (including the physical point) and 5 different lattice spacings down to a = 0.039 fm. The momentum smearing technique and a new operator basis are employed to reduce statistical fluctuations and to improve the overlap with the ground states. The results are obtained from a combined chiral and continuum limit extrapolation that includes three separate trajectories in the quark mass plane.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | PION FORM-FACTOR; LOOP ANOMALOUS DIMENSION; EXCLUSIVE PROCESSES; SUM-RULES; ASYMPTOTIC-BEHAVIOR; 2ND MOMENT; QUANTUM CHROMODYNAMICS; PERTURBATIVE QCD; RENORMALIZATION; (MS)OVER-BAR; Lattice QCD; Nonperturbative Effects; Kaon Physics |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Braun > Group Vladimir Braun Physics > Institute of Theroretical Physics > Chair Professor Schäfer > Group Andreas Schäfer Physics > Institute of Theroretical Physics > Chair Professor Schäfer > Group Gunnar Bali |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 07 Apr 2020 05:37 |
| Last Modified: | 07 Apr 2020 05:37 |
| URI: | https://pred.uni-regensburg.de/id/eprint/26437 |
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