Kaon and Pion Electromagnetic Form Factor Ratios in the Light-Front

Dias, Otávio Augusto Titton; Filho, Victo S.; Melo, J. P. B. C. de

doi:10.1016/j.nuclphysbps.2010.02.044

Cited by 7 publications

(11 citation statements)

References 16 publications

(12 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We remark that a larger regulator mass results in a smaller charge radius, as expected. The strange constituent quark mass has been readjusted from its value m s = 451 MeV [45] to obtain a better agreement with the kaon charge radius while keeping m R = 1.0 GeV. The value m s = 510 MeV we here choose is in agreement with a definition of the Euclidean constituent quark mass derived from solutions of Dyson-Schwinger equations [51,52].…”

mentioning

confidence: 92%

Pion and kaon elastic form factors in a refined light-front model

et al. 2012

View full text Add to dashboard Cite

Within the framework of light-front field theory, we reassess the electromagnetic form factors of the pion and kaon. Comparison with experiment is made for the full range of momentum transfer, q 2 < 0, including recent data. The light-front model's single regulator mass, mR, of theqq boundstate vertex function is initially adjusted to reproduce the weak decay constants, fπ and fK , and both meson's charge radii, rπ and rK . We study the behavior of these observables under variation of the quark masses and find an optimized parameter set, mu = m d , ms and mR, for which they are in sensibly better agreement with experiment than in a previous analysis; a feature also observed for the elastic form factors, in particular at small q 2 . This model refinement is important in view of an extension to vector and heavy-light mesons.

show abstract

mentioning

confidence: 92%

Pion and kaon elastic form factors in a refined light-front model

et al. 2012

View full text Add to dashboard Cite

show abstract

“…There have been numerous studies of hadron PDFs and form factors within quark models of various degrees of sophistication and success, for example, see Refs. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] and [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32], respectively.…”

Section: Introductionmentioning

confidence: 99%

Flavor dependence of the pion and kaon form factors and parton distribution functions

2016

View full text Add to dashboard Cite

The separate quark flavour contributions to the pion and kaon valence quark distribution functions are studied, along with the corresponding electromagnetic form factors in the space-like region. The calculations are made using the solution of the Bethe-Salpeter equation for the model of Nambu and Jona-Lasinio with proper-time regularization. Both the pion and kaon form factors and the valence quark distribution functions reproduce many features of the available empirical data. The larger mass of the strange quark naturally explains the empirical fact that the ratio u K + (x)/u π + (x) drops below unity at large x, with a value of approximately M 2 u /M 2 s as x → 1. With regard to the elastic form factors we report a large flavour dependence, with the u-quark contribution to the kaon form factor being an order of magnitude smaller than that of the s-quark at large Q 2 , which may be a sensitive measure of confinement effects in QCD. Surprisingly though, the total K + and π + form factors differ by only 10%. In general we find that flavour breaking effects are typically around 20%.

show abstract

“…As described in Refs. [11,18], the electromagnetic form factor of the pion receives only a valence contribution to the plus component of the electromagnetic current. In the case of the NSV model, Γ(k, p) is the regulator vertex function known as nonsymmetrical vertex, which can be written as [11,18]:…”

Section: The Modelmentioning

confidence: 99%

“…In the theory of light mesons, relevant problems considered in the literature concern, for instance, the calculation of the mass and decay constant of the pion in a relativistic potential model of independent quarks [8], the study of masses and electroweak properties of light mesons in a relativistic quark model [9] and the study of a relativistic treatment of pion wave functions in the annihilationpp → ππ + [10], beside a lot of other works in which are considered calculations involving light mesons, as in Refs. [11,12,13,14,15].…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic structure of pion

Mello¹,

Filho²,

Silva³

et al. 2013

AIP Conference Proceedings

View full text Add to dashboard Cite

Abstract.In this work, we analyze the electromagnetic structure of the pion. We calculate its electromagnetic radius and electromagnetic form factor in low and intermediate momentum range. Such observables are determined by means of a theoretical model that takes into account the constituent quark and antiquark of the pion within the formalism of light-front field theory. In particular, we consider a nonsymmetrical vertex in this model, with which we calculate the electromagnetic form factor of the pion in an optimized way, so that we obtain a value closer to the experimental charge radius of the pion. The theoretical calculations are also compared with the most recent experimental data involving the pion electromagnetic form factor and the results show very good agreement.

show abstract

Kaon and Pion Electromagnetic Form Factor Ratios in the Light-Front

Cited by 7 publications

References 16 publications

Pion and kaon elastic form factors in a refined light-front model

Pion and kaon elastic form factors in a refined light-front model

Flavor dependence of the pion and kaon form factors and parton distribution functions

Electromagnetic structure of pion

Contact Info

Product

Resources

About