Measuring the a0-a2 pion scattering lengths through K→3π decays

被引：0
|
作者：
Scimemi, Ignazio [1 ]
Gamiz, Elvira [2 ]
Prades, Joaquim [3 ]
机构：
[1] Univ Politecn Valencia, CSIC, IFIC, Dept Fis Teor, E-46071 Valencia, Spain
[2] Univ Illinois, Dept Phys, Urbana, IL 61801 USA
[3] CERN, Dept Phys, Theory Unit, CH-1211 Geneva, Switzerland
来源：
NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS | 2007年 / 174卷
关键词：
D O I：
10.1016/j.nuclphysbps.2007.08.098
中图分类号：
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号：
摘要：
We discuss the recent Cabibbo's proposal to measure the pi pi scattering lengths combination a(0) - a(2) from the cusp effect in the pi(0)pi(0) energy spectrum at threshold for K+ -> pi(0)pi(0)pi(+) and K-L -> pi(0)pi(0)pi(0). We estimate the theoretical uncertainty of the a(0) - a(2) determination at NLO in our approach and obtain that it is not smaller than 5% for K+ -> pi(0)pi(0)pi(+). One gets similar theoretical uncertainties if the neutral K-L -> pi(0)pi(0)pi(0) decay data below threshold axe used instead. For this decay, there axe very large theoretical uncertainties above threshold due to cancellations and data above threshold cannot be used to get the scattering lengths.
引用
收藏
页码：105 / 108
页数：4
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