We report a direct measurement of D(0)-(D) over bar (0) mixing parameters through a time-dependent amplitude analysis of the Dalitz plots of D(0) -> K(S)(0)pi(+)pi(-) and, for the first time, D(0) -> K(S)(0)K(+)K(-) decays. The low-momentum pion pi(+)(s) in the decay D*(+) -> D(0)pi(+)(s) identifies the flavor of the neutral D meson at its production. Using 468.5 fb(-1) of e(+)e(-) colliding-beam data recorded near root s = 10.6 by the BABAR detector at the PEP-II asymmetric-energy collider at SLAC, we measure the mixing parameters x = [1.6 + 2.3(stat) +/- 1.2(syst) +/- 0.8(model)] X 10(-3), and y = [5.7 +/- 2.0(stat) +/- 1.3(syst) +/- 0.7(model)] X 10(-3). These results provide the best measurement to date of x and y. The knowledge of the value of x, in particular, is crucial for understanding the origin of mixing.
Measurement of D(0)-(D)over-bar(0) Mixing Parameters Using D(0) -> K(S)(0)pi(+) pi(-) and D(0) -> K(S)(0)K(+)K(-) Decays RID C-5223-2009
LUSIANI, Alberto;
2010
Abstract
We report a direct measurement of D(0)-(D) over bar (0) mixing parameters through a time-dependent amplitude analysis of the Dalitz plots of D(0) -> K(S)(0)pi(+)pi(-) and, for the first time, D(0) -> K(S)(0)K(+)K(-) decays. The low-momentum pion pi(+)(s) in the decay D*(+) -> D(0)pi(+)(s) identifies the flavor of the neutral D meson at its production. Using 468.5 fb(-1) of e(+)e(-) colliding-beam data recorded near root s = 10.6 by the BABAR detector at the PEP-II asymmetric-energy collider at SLAC, we measure the mixing parameters x = [1.6 + 2.3(stat) +/- 1.2(syst) +/- 0.8(model)] X 10(-3), and y = [5.7 +/- 2.0(stat) +/- 1.3(syst) +/- 0.7(model)] X 10(-3). These results provide the best measurement to date of x and y. The knowledge of the value of x, in particular, is crucial for understanding the origin of mixing.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
