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Title: Analysis of D0 -> K+ pi- pi0 Decays: Search for D0-D0bar Mixing, and Measurements of the Doubly Cabibbo-Suppressed Decay Rate and Resonance Contributions

Abstract

Analyzing D{sup 0} {yields} K{sup +}{pi}{sup -}{pi}{sup 0} decays, herein are presented the methods and results of a search for D{sup 0}-{bar D}{sup 0} mixing, a measurement of the branching ratio R {equivalent_to} {Lambda}(D{sup 0} {yields} K{sup +}{pi}{sup -}{pi}{sup 0})/{Lambda}(D{sup 0} {yields} K{sup -}{pi}{sup +}{pi}{sup 0}), and measurements of the contributions from D{sup 0} {yields} K{sup +}{rho}{sup -}, K*{sup +}{pi}{sup -}, K*{sup 0}{pi}{sup 0}; 230.4 fb{sup -1} of data collected from the BABAR detector at the PEP-II collider during 2000-2004 (Runs 1-4) are analyzed. An event-level tagging technique is developed, which facilitates the accurate determination of doubly Cabibbo-suppressed resonance contributions by suppressing background from Cabibbo-favored decays. The branching ratio is measured as R = (0.214 {+-} 0.008 (stat) {+-} 0.008 (syst))%, with (46.1 {+-} 3.3 (stat) {+-} 2.9 (syst))% of D{sup 0} {yields} K{sup +}{pi}{sup -}{pi}{sup 0} decays proceeding through the channel D{sup 0} {yields} K*{sup +}{pi}{sup -}. The data are consistent with the null-D-mixing hypothesis at a confidence level of 10%, and the expected value of {+-} {radical}(x{sup 2} + y{sup 2}) is measured as -0.013 {+-} 0.010 (stat), indicating negative interference between mixing and doubly Cabibbo-suppressed decay. The expected value of the integrated mixing rate is (x{sup 2}more » + y{sup 2})/2 = (0.013 {+-} 0.013 (stat))%.« less

Authors:
Publication Date:
Research Org.:
Stanford Linear Accelerator Center (SLAC)
Sponsoring Org.:
USDOE
OSTI Identifier:
877513
Report Number(s):
SLAC-R-792
TRN: US0601433
DOE Contract Number:
AC02-76SF00515
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; BRANCHING RATIO; PARTICLE DECAY; RESONANCE; D NEUTRAL MESONS; ANTI-D NEUTRAL MESONS; KAONS PLUS; PIONS MINUS; PIONS NEUTRAL; MIXING RATIO; CABIBBO ANGLE; Experiment-HEP,HEPEX

Citation Formats

Wilson, Michael Galante. Analysis of D0 -> K+ pi- pi0 Decays: Search for D0-D0bar Mixing, and Measurements of the Doubly Cabibbo-Suppressed Decay Rate and Resonance Contributions. United States: N. p., 2005. Web. doi:10.2172/877513.
Wilson, Michael Galante. Analysis of D0 -> K+ pi- pi0 Decays: Search for D0-D0bar Mixing, and Measurements of the Doubly Cabibbo-Suppressed Decay Rate and Resonance Contributions. United States. doi:10.2172/877513.
Wilson, Michael Galante. Tue . "Analysis of D0 -> K+ pi- pi0 Decays: Search for D0-D0bar Mixing, and Measurements of the Doubly Cabibbo-Suppressed Decay Rate and Resonance Contributions". United States. doi:10.2172/877513. https://www.osti.gov/servlets/purl/877513.
@article{osti_877513,
title = {Analysis of D0 -> K+ pi- pi0 Decays: Search for D0-D0bar Mixing, and Measurements of the Doubly Cabibbo-Suppressed Decay Rate and Resonance Contributions},
author = {Wilson, Michael Galante},
abstractNote = {Analyzing D{sup 0} {yields} K{sup +}{pi}{sup -}{pi}{sup 0} decays, herein are presented the methods and results of a search for D{sup 0}-{bar D}{sup 0} mixing, a measurement of the branching ratio R {equivalent_to} {Lambda}(D{sup 0} {yields} K{sup +}{pi}{sup -}{pi}{sup 0})/{Lambda}(D{sup 0} {yields} K{sup -}{pi}{sup +}{pi}{sup 0}), and measurements of the contributions from D{sup 0} {yields} K{sup +}{rho}{sup -}, K*{sup +}{pi}{sup -}, K*{sup 0}{pi}{sup 0}; 230.4 fb{sup -1} of data collected from the BABAR detector at the PEP-II collider during 2000-2004 (Runs 1-4) are analyzed. An event-level tagging technique is developed, which facilitates the accurate determination of doubly Cabibbo-suppressed resonance contributions by suppressing background from Cabibbo-favored decays. The branching ratio is measured as R = (0.214 {+-} 0.008 (stat) {+-} 0.008 (syst))%, with (46.1 {+-} 3.3 (stat) {+-} 2.9 (syst))% of D{sup 0} {yields} K{sup +}{pi}{sup -}{pi}{sup 0} decays proceeding through the channel D{sup 0} {yields} K*{sup +}{pi}{sup -}. The data are consistent with the null-D-mixing hypothesis at a confidence level of 10%, and the expected value of {+-} {radical}(x{sup 2} + y{sup 2}) is measured as -0.013 {+-} 0.010 (stat), indicating negative interference between mixing and doubly Cabibbo-suppressed decay. The expected value of the integrated mixing rate is (x{sup 2} + y{sup 2})/2 = (0.013 {+-} 0.013 (stat))%.},
doi = {10.2172/877513},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Dec 13 00:00:00 EST 2005},
month = {Tue Dec 13 00:00:00 EST 2005}
}

Technical Report:

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  • We present results of a search for D{sup 0}-{bar D}{sup 0} mixing and a measurement of R{sub D}, the ratio of doubly Cabibbo-suppressed decays to Cabibbo-favored decays, based on an analysis of D{sup 0} {yields} K{sup +}{pi}{sup -} decays in 57.1 fb{sup -1} of data collected at or just below the {Upsilon}(4S) resonance with the BABAR detector at the PEP-II collider. Our results are compatible with no mixing and no CP violation. At the 95% confidence level, allowing for CP violation, we find the mixing parameters x{prime}{sup 2} < 0.0022 and -0.056 < y{prime} < 0.039, and the mixing ratemore » R{sub M} < 0.16%. In the limit of no mixing, R{sub D} = (0.357 {+-} 0.022 (stat.) {+-} 0.027 (syst.))% and the CP-violating asymmetry A{sub D} = 0.095 {+-} 0.061 (stat.) {+-} 0.083 (syst.).« less
  • The authors present an analysis of the decay D{sup 0} {yields} K{sup +}{pi}{sup -} based on FOCUS data. From a sample of 234 signal events, they find a branching ratio of {Lambda}(D{sup 0} {yields} K{sup +}{pi}{sup -})/{Lambda}(D{sup 0} {yields} K{sup -}{pi}{sup +}) = (0.429{sub -0.061}{sup +0-.063} {+-} 0.027)% under the assumptions of no mixing and no CP violation. Allowing for CP violation, the find a branching ratio of (0.435{sub -0.061}{sup +0.063} {+-} 0.028)% and a CP asymmetry of 0.178{sub -0.141}{sup +0.144} {+-} 0.041. The branching ratio for the case of mixing with no CP violation is (0.381{sub -0.163}{sup +0.167} {+-}more » 0.092)%. They also present limits on charm mixing.« less
  • The D{sup 0} meson can decay to the wrong sign K{sup +} {pi}{sup -} state either through a doubly Cabibbo suppressed decay or via mixing to the {bar D}{sup 0} state followed by the Cabibbo favoured decay {bar D}{sup 0} {yields} K{sup +}{pi}{sup -}. We measure the rate of wrong sign decays relative to the Cabibbo favoured decay to (0.383 {+-} 0.044 {+-} 0.022)% and give our sensitivity to a mixing signal.
  • Using 226 million {Upsilon}(4S) {yields} B{bar B} events collected with the BABAR detector at the PEp-II e{sup +}e{sup -} storage ring at the Stanford Linear Accelerator Center, they measure the branching fraction for B{sup 0} {yields} {bar D}{sup 0}K{sup +}{pi}{sup -}, excluding B{sup 0} {yields} D*{sup -}K{sup +}, to be {Beta}(B{sup 0} {yields} {bar D}{sup 0}K{sup +}{pi}{sup -}) = 88 {+-} 15 {+-} 9 x 10{sup -6}. They observe B{sup 0} {yields} {bar D}{sup 0}K*(892){sup 0} and B{sup 0} {yields} D*{sub 2}(2460){sup -}K{sup +} contributions. The ratio of branching fractions {Beta}(B{sup 0} {yields} D*{sup -} K{sup +})/{Beta}(B{sup 0} {yields} D*{supmore » -}{pi}{sup +}) = (7.76 {+-} 0.34 {+-} 0.29)% is measured separately. The branching fraction for the suppressed mode B{sup 0} {yields} D{sup 0}K{sup +}{pi}{sup -} is {Beta}(B{sup 0} {yields} D{sup 0}K{sup +}{pi}{sup -}) < 19 x 10{sup -6} at the 90% confidence level.« less