What is the true ∆ I = 3 / 2 effect in kaon decays ?
نویسندگان
چکیده
In kaon decay, electromagnetic radiative corrections can generate shifts in the apparent ∆I = 3/2 amplitude of order αA0/A2 ∼ 22α. In order to know the true ∆I = 3/2 amplitude for comparison with lattice calculations and phenomenology, one needs to subtract off this electromagnetic effect. We provide a careful estimate of the electromagnetic shift in the amplitude, which shows that it is smaller than naive expectations, with a fractional shift of δA (em) 2 /A2 = −0.016± 0.01.
منابع مشابه
The leading chiral electromagnetic correction to the nonleptonic ∆ I = 3 / 2 amplitude in kaon decays
In kaon decay, electromagnetic radiative corrections can generate shifts in the apparent ∆I = 3/2 amplitude of order αA0/A2 ∼ 22α. In order to know the true ∆I = 3/2 amplitude for comparison with lattice calculations and phenomenology, one needs to subtract off this electromagnetic effect. We provide a careful estimate of the leading electromagnetic shift in the chiral expansion of the amplitud...
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تاریخ انتشار 1998