ИСТИНА |
Войти в систему Регистрация |
|
Интеллектуальная Система Тематического Исследования НАукометрических данных |
||
The measurement of the pi+pi- atom lifetime with 10% precision provides, in a model independent way, the difference between the S-wave pipi scattering lengths for isospin 0 and 2, |a0 - a2|, with 5% accuracy. The scattering lengths a0 and a2 have been calculated in Chiral Perturbation Theory (ChPT) with a precision better than 2.5%. Therefore, such a measurement will be a sensitive check of the understanding of chiral symmetry breaking in QCD.