Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-09-18
Phys.Lett. B602 (2004) 218-225
Physics
High Energy Physics
High Energy Physics - Phenomenology
13 pages, 2 figures. v2: minor changes - version to appear on Phys. Lett. B. v3: Published version. Values of the measured K-p
Scientific paper
10.1016/j.physletb.2004.10.005
The scalar radius of the pion plays an important role in CHPT, because it is related to one of the basic effective coupling constants, viz. the one which controls the quark mass dependence of F_pi at one loop. In a recent paper, Yndurain derives a {\it robust lower bound} for this radius, which disagrees with earlier determinations. We show that such a bound does not exist: the "derivation" relies on an incorrect claim. Moreover, we discuss the physics of the form factors associated with the operators \ubar u, \dbar d and \sbar s and show that their structure in the vicinity of the K \Kbar threshold is quite different. Finally, we draw attention to the fact that the new data on the slope of the scalar K_l3 form factor confirm a recent, remarkably sharp theoretical prediction.
Ananthanarayan Balasubramanian
Caprini Irinel
Colangelo Gilberto
Gasser Juerg
Leutwyler Heinrich
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