Title

Rate measurement of D0 → K+ π π0 and constraints on D0 − D¯0 mixing

Authors

G. Brandenburg, Harvard University
A. Ershov, Harvard University
D. Y.J. Kim, Harvard University
R. Wilson, Harvard University
T. Bergfeld, University of Illinois Urbana-Champaign
B. I. Eisenstein, University of Illinois Urbana-Champaign
J. Ernst, University of Illinois Urbana-Champaign
G. E. Gladding, University of Illinois Urbana-Champaign
G. D. Gollin, University of Illinois Urbana-Champaign
R. M. Hans, University of Illinois Urbana-Champaign
E. Johnson, University of Illinois Urbana-Champaign
I. Karliner, University of Illinois Urbana-Champaign
M. A. Marsh, University of Illinois Urbana-Champaign
C. Plager, University of Illinois Urbana-Champaign
C. Sedlack, University of Illinois Urbana-Champaign
M. Selen, University of Illinois Urbana-Champaign
J. J. Thaler, University of Illinois Urbana-Champaign
J. Williams, University of Illinois Urbana-Champaign
K. W. Edwards, Carleton University
A. J. Sadoff, Ithaca College
R. Ammar, University of Kansas, Lawrence
A. Bean, University of Kansas, Lawrence
D. Besson, University of Kansas, Lawrence
X. Zhao, University of Kansas, Lawrence
S. Anderson, University of Minnesota Twin Cities
V. V. Frolov, University of Minnesota Twin Cities
Y. Kubota, University of Minnesota Twin Cities
S. J. Lee, University of Minnesota Twin Cities
R. Poling, University of Minnesota Twin Cities
A. Smith, University of Minnesota Twin Cities
C. J. Stepaniak, University of Minnesota Twin Cities
J. Urheim, University of Minnesota Twin Cities
S. Ahmed, University at Albany

Document Type

Article

Publication Date

8-13-2001

Abstract

We present an observation and time-integrated rate measurement of the decay D → K π π produced in 9fb of e e collisions near the r(4S) resonance. The signal is inconsistent with an upward fluctuation of the background by 4.9 standard deviations. We measured the time-integrated rate of D → K π π normalized to the rate of D¯ → K π π to be 0.0043 (stat) ± 0.0007(syst) This decay can be produced by doubly Cabibbo-suppressed decays or by the D evolving into a D through mixing, followed by a Cabibbo-favored decay to K π π . We also found the CP asymmetry A = (9 )% be consistent with zero. © 2001 The American Physical Society. 0 + − 0 −1 + − 0 + − 0 0 + − 0 0.0011 0 ¯0 + − 0 +25 −0.0011 −22

Publication Name

Physical Review Letters

Volume Number

87

First Page

71802

Last Page

1

Issue Number

7

DOI

10.1103/PhysRevLett.87.071802

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