skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Measurement of partial widths and search for direct CP violation in D0 meson decays to K- K+ and pi- pi+

Abstract

The authors present a measurement of relative partial widths and decay rate CP asymmetries in K{sup -}K{sup +} and {pi}{sup -}{pi}{sup +} decays of D{sup 0} mesons produced in p{bar p} collisions at {radical}s = 1.96 TeV. They use a sample of 2 x 10{sup 5} D*{sup +} {yields} D{sup 0}{pi}{sup +} (and charge conjugate) decays with the D{sup 0} decaying to K{sup -} {pi}{sup +}, K{sup -}K{sup +}, and {pi}{sup -}{pi}{sup +}, corresponding to 123 pb{sup -1} of data collected by the CDF II experiment at the Fermilab Tevatron collider. No significant direct CP violation is observed, they measure {Lambda}(D{sup 0} {yields} K{sup -}K{sup +})/{Lambda}(D{sup 0} {yields} K{sup -}{pi}{sup +}) = 0.0992 {+-} 0.0011 {+-} 0.0012, {Lambda}(D{sup 0} {yields} {pi}{sup -}{pi}{sup +})/{Lambda}(D{sup 0} {yields} K{sup -}{pi}{sup +}) = 0.03594 {+-} 0.00054 {+-} 0.00040, {Lambda}(D{sup 0} {yields} K{sup -}K{sup +})/{Lambda}(D{sup 0} {yields} {pi}{sup -}{pi}{sup +}) = 2.760 {+-} 0.040 {+-} 0.034, A{sub CP} (K{sup -}K{sup +}) = (2.0 {+-} 1.2 {+-} 0.6)%, and A{sub CP}({pi}{sup -}{pi}{sup +}) = (1.0 {+-} 1.3 {+-} 0.6)%, where, in all cases, the first uncertainty is statistical and the second is systematic.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; more »; ; « less
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
15011768
Report Number(s):
FERMILAB-PUB-04-148-E
TRN: US0600339
DOE Contract Number:  
AC02-76CH03000
Resource Type:
Journal Article
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; DECAY; FERMILAB COLLIDER DETECTOR; FERMILAB TEVATRON; MESONS; Experiment-HEP

Citation Formats

Acosta, D., Affolder, T., Akimoto, T., Albrow, M.G., Ambrose, D., Amerio, S., Amidei, D., Anastassov, A., Anikeev, K., Annovi, A., Antos, J., Aoki, M., Apollinari, G., Arisawa, T., Arguin, J.-F., Artikov, A., Ashmanskas, W., Attal, A., Azfar, F., Azzi-Bacchetta, P., Bacchetta, N., and /Taiwan, Inst. Phys. /Argonne /Barcelona, IFAE /INFN, Bologna /Brandeis U. /UC, Davis /UCLA /UC, San Diego /UC, Santa Barbara /Cantabria Inst. of Phys. /Carnegie Mellon U. /Chicago U., EFI /Dubna, JINR /Duke U. /Fermilab /Florida U. /Frascati /Geneva U. /Glasgow U. /Harvard U. /Helsinki Inst. of Phys. Measurement of partial widths and search for direct CP violation in D0 meson decays to K- K+ and pi- pi+. United States: N. p., 2004. Web.
Acosta, D., Affolder, T., Akimoto, T., Albrow, M.G., Ambrose, D., Amerio, S., Amidei, D., Anastassov, A., Anikeev, K., Annovi, A., Antos, J., Aoki, M., Apollinari, G., Arisawa, T., Arguin, J.-F., Artikov, A., Ashmanskas, W., Attal, A., Azfar, F., Azzi-Bacchetta, P., Bacchetta, N., & /Taiwan, Inst. Phys. /Argonne /Barcelona, IFAE /INFN, Bologna /Brandeis U. /UC, Davis /UCLA /UC, San Diego /UC, Santa Barbara /Cantabria Inst. of Phys. /Carnegie Mellon U. /Chicago U., EFI /Dubna, JINR /Duke U. /Fermilab /Florida U. /Frascati /Geneva U. /Glasgow U. /Harvard U. /Helsinki Inst. of Phys. Measurement of partial widths and search for direct CP violation in D0 meson decays to K- K+ and pi- pi+. United States.
Acosta, D., Affolder, T., Akimoto, T., Albrow, M.G., Ambrose, D., Amerio, S., Amidei, D., Anastassov, A., Anikeev, K., Annovi, A., Antos, J., Aoki, M., Apollinari, G., Arisawa, T., Arguin, J.-F., Artikov, A., Ashmanskas, W., Attal, A., Azfar, F., Azzi-Bacchetta, P., Bacchetta, N., and /Taiwan, Inst. Phys. /Argonne /Barcelona, IFAE /INFN, Bologna /Brandeis U. /UC, Davis /UCLA /UC, San Diego /UC, Santa Barbara /Cantabria Inst. of Phys. /Carnegie Mellon U. /Chicago U., EFI /Dubna, JINR /Duke U. /Fermilab /Florida U. /Frascati /Geneva U. /Glasgow U. /Harvard U. /Helsinki Inst. of Phys. Sun . "Measurement of partial widths and search for direct CP violation in D0 meson decays to K- K+ and pi- pi+". United States. https://www.osti.gov/servlets/purl/15011768.
@article{osti_15011768,
title = {Measurement of partial widths and search for direct CP violation in D0 meson decays to K- K+ and pi- pi+},
author = {Acosta, D. and Affolder, T. and Akimoto, T. and Albrow, M.G. and Ambrose, D. and Amerio, S. and Amidei, D. and Anastassov, A. and Anikeev, K. and Annovi, A. and Antos, J. and Aoki, M. and Apollinari, G. and Arisawa, T. and Arguin, J.-F. and Artikov, A. and Ashmanskas, W. and Attal, A. and Azfar, F. and Azzi-Bacchetta, P. and Bacchetta, N. and /Taiwan, Inst. Phys. /Argonne /Barcelona, IFAE /INFN, Bologna /Brandeis U. /UC, Davis /UCLA /UC, San Diego /UC, Santa Barbara /Cantabria Inst. of Phys. /Carnegie Mellon U. /Chicago U., EFI /Dubna, JINR /Duke U. /Fermilab /Florida U. /Frascati /Geneva U. /Glasgow U. /Harvard U. /Helsinki Inst. of Phys.},
abstractNote = {The authors present a measurement of relative partial widths and decay rate CP asymmetries in K{sup -}K{sup +} and {pi}{sup -}{pi}{sup +} decays of D{sup 0} mesons produced in p{bar p} collisions at {radical}s = 1.96 TeV. They use a sample of 2 x 10{sup 5} D*{sup +} {yields} D{sup 0}{pi}{sup +} (and charge conjugate) decays with the D{sup 0} decaying to K{sup -} {pi}{sup +}, K{sup -}K{sup +}, and {pi}{sup -}{pi}{sup +}, corresponding to 123 pb{sup -1} of data collected by the CDF II experiment at the Fermilab Tevatron collider. No significant direct CP violation is observed, they measure {Lambda}(D{sup 0} {yields} K{sup -}K{sup +})/{Lambda}(D{sup 0} {yields} K{sup -}{pi}{sup +}) = 0.0992 {+-} 0.0011 {+-} 0.0012, {Lambda}(D{sup 0} {yields} {pi}{sup -}{pi}{sup +})/{Lambda}(D{sup 0} {yields} K{sup -}{pi}{sup +}) = 0.03594 {+-} 0.00054 {+-} 0.00040, {Lambda}(D{sup 0} {yields} K{sup -}K{sup +})/{Lambda}(D{sup 0} {yields} {pi}{sup -}{pi}{sup +}) = 2.760 {+-} 0.040 {+-} 0.034, A{sub CP} (K{sup -}K{sup +}) = (2.0 {+-} 1.2 {+-} 0.6)%, and A{sub CP}({pi}{sup -}{pi}{sup +}) = (1.0 {+-} 1.3 {+-} 0.6)%, where, in all cases, the first uncertainty is statistical and the second is systematic.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2004},
month = {8}
}