Flavour symmetry breaking in the kaon parton distribution amplitude

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	Flavour symmetry breaking in the kaon parton distribution amplitude
	Shi, C ; Chang, L ; Roberts, CD ; Schmidt, SM ; Tandy, PC ; Zong, HS
刊名	PHYSICS LETTERS B
	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
ISSN号	0370-2693
通讯作者	Roberts, CD (reprint author), Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA.
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.
学科主题	Physics
收录类别	SCI
资助信息	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]
原文出处	http://dx.doi.org/10.1016/j.physletb.2014.07.057
语种	英语
WOS记录号	WOS:000344624900077
公开日期	2015-06-03
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/15578]
专题	理论物理研究所_理论物理所1978-2010年知识产出
推荐引用方式 GB/T 7714	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.
APA	Shi, C,Chang, L,Roberts, CD,Schmidt, SM,Tandy, PC,&Zong, HS.(2014).Flavour symmetry breaking in the kaon parton distribution amplitude.PHYSICS LETTERS B,738(-),512-518.
MLA	Shi, C,et al."Flavour symmetry breaking in the kaon parton distribution amplitude".PHYSICS LETTERS B 738.-(2014):512-518.