A measurement of the direct CP violating charge asymmetries of the Dalitz plot linear slopes Ag = (g(+) - g(-))/(g(+) + g(-)) in K-+/- -> pi(+/-) pi(+) pi(-) and K-+/- -> pi(+/-) pi(0) pi(0) decays by the NA48/2 experiment at CERN SPS is presented. A new technique of asymmetry measurement involving simultaneous K+ and K- beams and a large data sample collected allowed a result of an unprecedented precision. The charge asymmetries were measured to be A(g)(c) = (-1.5 +/- 2.2) x 10(-4) with 3.11 x 10(9) K-+/- -> pi(+/-) pi(+) pi(-) decays, and A(g)(n) = (1.8 +/- 1.8) x 10(-4) with 9.13 x 10(7) K-+/- -> pi(+/-) pi(0) pi(0) decays. The precision of the results is limited mainly by the size of the data sample.
Search for direct CP violating charge asymmetries in K±->π±π+π- and K±->π±π0π0 decays
MARTELLI, FILIPPO;VELTRI, MICHELE;
2007
Abstract
A measurement of the direct CP violating charge asymmetries of the Dalitz plot linear slopes Ag = (g(+) - g(-))/(g(+) + g(-)) in K-+/- -> pi(+/-) pi(+) pi(-) and K-+/- -> pi(+/-) pi(0) pi(0) decays by the NA48/2 experiment at CERN SPS is presented. A new technique of asymmetry measurement involving simultaneous K+ and K- beams and a large data sample collected allowed a result of an unprecedented precision. The charge asymmetries were measured to be A(g)(c) = (-1.5 +/- 2.2) x 10(-4) with 3.11 x 10(9) K-+/- -> pi(+/-) pi(+) pi(-) decays, and A(g)(n) = (1.8 +/- 1.8) x 10(-4) with 9.13 x 10(7) K-+/- -> pi(+/-) pi(0) pi(0) decays. The precision of the results is limited mainly by the size of the data sample.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
