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19 April 2024 |
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First Measurement of the Neutral Kaon Form Factor and the Effect of SU(3) Breaking | | Kamal K. Seth
; S. Dobbs
; A. Tomaradze
; T. Xiao
; G. Bonvicini
; | | Date: |
24 Jul 2013 | | Abstract: | At large momentum transfers the photon interacts with the constituent partons
in a hadron and a neutral hadron acquires an electromagnetic form factor. Open
flavor neutral mesons are expected to acquire finite electromagnetic form
factors because their wave functions are affected by the differences in the
masses of the different flavor quarks which they contain. For neutral kaons
this corresponds to SU(3) breaking. We report on the first measurement of the
form factor of neutral kaons at the large timelike momentum transfer of
|Q^2|=17.4 GeV^2 by measuring the cross section for e+e- -> KSKL at sqrt{s} =
4.17 GeV using CLEO-c data with an integrated luminosity of 586 pb^-1. We
obtain F_KSKL(17.4 GeV^2) = 3.9 x 10^-3, with a 90% confidence interval of
(0-7.0) x 10^-3. This is an order of magnitude smaller than F_K+K-(17.4 GeV^2),
and indicates that the effect of SU(3) breaking is small. The small SU(3)
breaking effect which we find makes it unlikely that the recently observed
strong violation of the pQCD prediction, $F_pi+pi-(|Q^2|)/F_K+K-(|Q^2|) =
f_pi^2/f_K^2, which is based on the assumption of similar wave functions for
the pions and kaons, can be attributed to SU(3) breaking alone. | | Source: | arXiv, 1307.6587 | | Services: | Forum | Review | PDF | Favorites | |
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