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题名: Flavour symmetry breaking in the kaon parton distribution amplitude
作者: Shi, C ;  Chang, L ;  Roberts, CD ;  Schmidt, SM ;  Tandy, PC ;  Zong, HS
刊名: PHYSICS LETTERS B
出版日期: 2014
卷号: 738, 期号:-, 页码:512-518
关键词: DYSON-SCHWINGER EQUATIONS ;  PION FORM-FACTOR ;  QUANTUM CHROMODYNAMICS ;  EXCLUSIVE PROCESSES ;  SU(3) BREAKING ;  QCD ;  MESONS ;  FACTORIZATION ;  CONFINEMENT ;  BEHAVIOR
学科分类: Physics
DOI: 10.1016/j.physletb.2014.07.057
通讯作者: Roberts, CD (reprint author), Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA.
部门归属: [Shi, Chao] Nanjing Univ, Inst Acoust, Key Lab Modern Acoust, MOE, Nanjing 210093, Jiangsu, Peoples R China
英文摘要: We compute the kaon's valence-quark (twist-two parton) distribution amplitude (PDA) by projecting its Poincare-covariant Bethe-Salpeter wave-function onto the light-front. At a scale zeta = 2GeV, the PDA is abroad, concave and asymmetric function, whose peak is shifted 12-16% away from its position in QCD's conformal limit. These features are a clear expression of SU(3)-flavour-symmetry breaking. They show that the heavier quark in the kaon carries more of the bound-state's momentum than the lighter quark and also that emergent phenomena in QCD modulate the magnitude of flavour-symmetry breaking: it is markedly smaller than one might expect based on the difference between light-quark current masses. Our results add to a body of evidence which indicates that at any energy scale accessible with existing or foreseeable facilities, a reliable guide to the interpretation of experiment requires the use of such nonperturbatively broadened PDAs in leading-order, leading-twist formulae for hard exclusive processes instead of the asymptotic PDA associated with QCD's conformal limit. We illustrate this via the ratio of kaon and pion electromagnetic form factors: using our nonperturbative PDAs in the appropriate formulae, F-K/F-pi = 1.23 at spacelike-Q(2) = 17 GeV2, which compares satisfactorily with the value of 0.92(5) inferred in e(+)e(-) annihilation at s = 17GeV(2). (C) 2014 Argonne National Laboratory and the authors. Published by Elsevier B. V.
资助者: International Fellow Award from the Helmholtz Association; National Natural Science Foundation of China [11275097, 11274166]; National Basic Research Program of China [2012CB921504]; Research Fund for the Doctoral Program of Higher Education (China) [2012009111002]; University of Adelaide; Australian Research Council [FL0992247]; Department of Energy, Office of Nuclear Physics [DE-AC02-06CH11357]; Forschungszentrum Julich GmbH; National Science Foundation [NSF-PHY1206187]
收录类别: SCI
原文出处: 查看原文
语种: 英语
WOS记录号: WOS:000344624900077
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/15578
Appears in Collections:理论物理所2014年知识产出 _期刊论文

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Recommended Citation:
Shi, C,Chang, L,Roberts, CD,et al. Flavour symmetry breaking in the kaon parton distribution amplitude[J]. PHYSICS LETTERS B,2014,738(-):512-518.
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