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Title: Measurement of the Hadronic Form factor in D0 to K- e+ nu_e Decays

Abstract

The shape of the hadronic form factor f{sub +} (q{sup 2}) in the decay D{sup 0} {yields} K{sup -} e{sup +}{nu}{sub e} has been measured in a model independent analysis and compared with theoretical calculations. They use 75 fb{sup -1} of data recorded by the BABAR detector at the PEPII electron-positron collider. The corresponding decay branching fraction, relative to the decay D{sup 0} {yields} K{sup -} {pi}{sup +}, has also been measured to be R{sub D} = BR(D{sup 0} {yields} K{sup -}e{sup +}{nu}{sub e})/BR(D{sup 0} {yields} K{sup -}{pi}{sup +}) = 0.927 {+-} 0.007 {+-} 0.012. From these results, and using the present world average value for BR(D{sup 0} {yields} K{sup -}{pi}{sup +}), the normalization of the form factor at q{sup 2} = 0 is determined to be f{sub +}(0) = 0.727 {+-} 0.007 {+-} 0.005 {+-} 0.007 where the uncertainties are statistical, systematic, and from external inputs, respectively.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; more »; ; ; ; ; ; « less
Publication Date:
Research Org.:
Stanford Linear Accelerator Center (SLAC)
Sponsoring Org.:
USDOE
OSTI Identifier:
902100
Report Number(s):
SLAC-PUB-12417
arXiv:0704.0020; TRN: US200717%%350
DOE Contract Number:
AC02-76SF00515
Resource Type:
Conference
Resource Relation:
Journal Name: Physical Review D; Conference: Presented at 42nd Rencontres de Moriond on QCD and Hadronic Interactions, La Thuile, Italy, 17-24 Mar 2007
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; DECAY; FORM FACTORS; QUANTUM CHROMODYNAMICS; SHAPE; Experiment-HEP,HEPEX

Citation Formats

Aubert, B., Bona, M., Boutigny, D., Karyotakis, Y., Lees, J.P., Poireau, V., Prudent, X., Tisserand, V., Zghiche, A., /Paris U., VI-VII, Garra Tico, J., Grauges, E., /Barcelona U., ECM, Lopez, L., Palano, A., /Bari U., Eigen, G., Stugu, B., Sun, L., /Bergen U., Abrams, G.S., Battaglia, M., Brown, D.N., Button-Shafer, J., Cahn, R.N., and /Energy Sci. Network /Birmingham U. /Ruhr U., Bochum /Bristol U. /British Columbia U. /Brunel U. /Novosibirsk, IYF /UC, Irvine /UCLA /UC, Riverside /UC, San Diego /UC, Santa Barbara /UC, Santa Cruz /Caltech /Cincinnati U. /Colorado U. /Colorado State U. /Dortmund U. /Leipzig, Tech. Hochsch. /Ecole Polytechnique /Edinburgh U. /Ferrara U. /Frascati /Genoa U. /Harvard U. /Heidelberg U. /Imperial Coll., London /Iowa U. /Iowa State U. /Johns Hopkins U. /Karlsruhe U. /Paris U., VI-VII /LLNL, Livermore /Liverpool U. /Queen Mary, U. of London /Royal Holloway, U. of London /Louisville U. /Manchester U. /Maryland U. /Massachusetts U., Amherst /MIT, LNS /McGill U. /Milan U. /Mississippi U. /Concordia U., Montreal /Mt. Holyoke Coll. /Naples U. /NIKHEF, Amsterdam /Notre Dame U. /Ohio State U. /Oregon U. /Padua U. /Paris U., VI-VII /Pennsylvania U. /Perugia U. /Pisa U. /Prairie View A-M /Princeton U. /INFN, Rome /Rostock U. /Rutherford /DSM, DAPNIA, Saclay /South Carolina U. /SLAC /Stanford U., Phys. Dept. /SUNY, Albany /Tennessee U. /Texas U. /Texas U., Dallas /Turin U. /Trieste U. /Valencia U., IFIC /Victoria U. /Warwick U. /Wisconsin U., Madison /Yale U. Measurement of the Hadronic Form factor in D0 to K- e+ nu_e Decays. United States: N. p., 2007. Web.
Aubert, B., Bona, M., Boutigny, D., Karyotakis, Y., Lees, J.P., Poireau, V., Prudent, X., Tisserand, V., Zghiche, A., /Paris U., VI-VII, Garra Tico, J., Grauges, E., /Barcelona U., ECM, Lopez, L., Palano, A., /Bari U., Eigen, G., Stugu, B., Sun, L., /Bergen U., Abrams, G.S., Battaglia, M., Brown, D.N., Button-Shafer, J., Cahn, R.N., & /Energy Sci. Network /Birmingham U. /Ruhr U., Bochum /Bristol U. /British Columbia U. /Brunel U. /Novosibirsk, IYF /UC, Irvine /UCLA /UC, Riverside /UC, San Diego /UC, Santa Barbara /UC, Santa Cruz /Caltech /Cincinnati U. /Colorado U. /Colorado State U. /Dortmund U. /Leipzig, Tech. Hochsch. /Ecole Polytechnique /Edinburgh U. /Ferrara U. /Frascati /Genoa U. /Harvard U. /Heidelberg U. /Imperial Coll., London /Iowa U. /Iowa State U. /Johns Hopkins U. /Karlsruhe U. /Paris U., VI-VII /LLNL, Livermore /Liverpool U. /Queen Mary, U. of London /Royal Holloway, U. of London /Louisville U. /Manchester U. /Maryland U. /Massachusetts U., Amherst /MIT, LNS /McGill U. /Milan U. /Mississippi U. /Concordia U., Montreal /Mt. Holyoke Coll. /Naples U. /NIKHEF, Amsterdam /Notre Dame U. /Ohio State U. /Oregon U. /Padua U. /Paris U., VI-VII /Pennsylvania U. /Perugia U. /Pisa U. /Prairie View A-M /Princeton U. /INFN, Rome /Rostock U. /Rutherford /DSM, DAPNIA, Saclay /South Carolina U. /SLAC /Stanford U., Phys. Dept. /SUNY, Albany /Tennessee U. /Texas U. /Texas U., Dallas /Turin U. /Trieste U. /Valencia U., IFIC /Victoria U. /Warwick U. /Wisconsin U., Madison /Yale U. Measurement of the Hadronic Form factor in D0 to K- e+ nu_e Decays. United States.
Aubert, B., Bona, M., Boutigny, D., Karyotakis, Y., Lees, J.P., Poireau, V., Prudent, X., Tisserand, V., Zghiche, A., /Paris U., VI-VII, Garra Tico, J., Grauges, E., /Barcelona U., ECM, Lopez, L., Palano, A., /Bari U., Eigen, G., Stugu, B., Sun, L., /Bergen U., Abrams, G.S., Battaglia, M., Brown, D.N., Button-Shafer, J., Cahn, R.N., and /Energy Sci. Network /Birmingham U. /Ruhr U., Bochum /Bristol U. /British Columbia U. /Brunel U. /Novosibirsk, IYF /UC, Irvine /UCLA /UC, Riverside /UC, San Diego /UC, Santa Barbara /UC, Santa Cruz /Caltech /Cincinnati U. /Colorado U. /Colorado State U. /Dortmund U. /Leipzig, Tech. Hochsch. /Ecole Polytechnique /Edinburgh U. /Ferrara U. /Frascati /Genoa U. /Harvard U. /Heidelberg U. /Imperial Coll., London /Iowa U. /Iowa State U. /Johns Hopkins U. /Karlsruhe U. /Paris U., VI-VII /LLNL, Livermore /Liverpool U. /Queen Mary, U. of London /Royal Holloway, U. of London /Louisville U. /Manchester U. /Maryland U. /Massachusetts U., Amherst /MIT, LNS /McGill U. /Milan U. /Mississippi U. /Concordia U., Montreal /Mt. Holyoke Coll. /Naples U. /NIKHEF, Amsterdam /Notre Dame U. /Ohio State U. /Oregon U. /Padua U. /Paris U., VI-VII /Pennsylvania U. /Perugia U. /Pisa U. /Prairie View A-M /Princeton U. /INFN, Rome /Rostock U. /Rutherford /DSM, DAPNIA, Saclay /South Carolina U. /SLAC /Stanford U., Phys. Dept. /SUNY, Albany /Tennessee U. /Texas U. /Texas U., Dallas /Turin U. /Trieste U. /Valencia U., IFIC /Victoria U. /Warwick U. /Wisconsin U., Madison /Yale U. Mon . "Measurement of the Hadronic Form factor in D0 to K- e+ nu_e Decays". United States. doi:. https://www.osti.gov/servlets/purl/902100.
@article{osti_902100,
title = {Measurement of the Hadronic Form factor in D0 to K- e+ nu_e Decays},
author = {Aubert, B. and Bona, M. and Boutigny, D. and Karyotakis, Y. and Lees, J.P. and Poireau, V. and Prudent, X. and Tisserand, V. and Zghiche, A. and /Paris U., VI-VII and Garra Tico, J. and Grauges, E. and /Barcelona U., ECM and Lopez, L. and Palano, A. and /Bari U. and Eigen, G. and Stugu, B. and Sun, L. and /Bergen U. and Abrams, G.S. and Battaglia, M. and Brown, D.N. and Button-Shafer, J. and Cahn, R.N. and /Energy Sci. Network /Birmingham U. /Ruhr U., Bochum /Bristol U. /British Columbia U. /Brunel U. /Novosibirsk, IYF /UC, Irvine /UCLA /UC, Riverside /UC, San Diego /UC, Santa Barbara /UC, Santa Cruz /Caltech /Cincinnati U. /Colorado U. /Colorado State U. /Dortmund U. /Leipzig, Tech. Hochsch. /Ecole Polytechnique /Edinburgh U. /Ferrara U. /Frascati /Genoa U. /Harvard U. /Heidelberg U. /Imperial Coll., London /Iowa U. /Iowa State U. /Johns Hopkins U. /Karlsruhe U. /Paris U., VI-VII /LLNL, Livermore /Liverpool U. /Queen Mary, U. of London /Royal Holloway, U. of London /Louisville U. /Manchester U. /Maryland U. /Massachusetts U., Amherst /MIT, LNS /McGill U. /Milan U. /Mississippi U. /Concordia U., Montreal /Mt. Holyoke Coll. /Naples U. /NIKHEF, Amsterdam /Notre Dame U. /Ohio State U. /Oregon U. /Padua U. /Paris U., VI-VII /Pennsylvania U. /Perugia U. /Pisa U. /Prairie View A-M /Princeton U. /INFN, Rome /Rostock U. /Rutherford /DSM, DAPNIA, Saclay /South Carolina U. /SLAC /Stanford U., Phys. Dept. /SUNY, Albany /Tennessee U. /Texas U. /Texas U., Dallas /Turin U. /Trieste U. /Valencia U., IFIC /Victoria U. /Warwick U. /Wisconsin U., Madison /Yale U.},
abstractNote = {The shape of the hadronic form factor f{sub +} (q{sup 2}) in the decay D{sup 0} {yields} K{sup -} e{sup +}{nu}{sub e} has been measured in a model independent analysis and compared with theoretical calculations. They use 75 fb{sup -1} of data recorded by the BABAR detector at the PEPII electron-positron collider. The corresponding decay branching fraction, relative to the decay D{sup 0} {yields} K{sup -} {pi}{sup +}, has also been measured to be R{sub D} = BR(D{sup 0} {yields} K{sup -}e{sup +}{nu}{sub e})/BR(D{sup 0} {yields} K{sup -}{pi}{sup +}) = 0.927 {+-} 0.007 {+-} 0.012. From these results, and using the present world average value for BR(D{sup 0} {yields} K{sup -}{pi}{sup +}), the normalization of the form factor at q{sup 2} = 0 is determined to be f{sub +}(0) = 0.727 {+-} 0.007 {+-} 0.005 {+-} 0.007 where the uncertainties are statistical, systematic, and from external inputs, respectively.},
doi = {},
journal = {Physical Review D},
number = ,
volume = ,
place = {United States},
year = {Mon Apr 09 00:00:00 EDT 2007},
month = {Mon Apr 09 00:00:00 EDT 2007}
}

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  • A preliminary measurement of the q{sup 2} dependence of the D{sup 0} {yields} K{sup -}e{sup +}{nu}{sub e} decay rate is presented. This rate is proportional to the hadronic form factor squared, specified by a single parameter. This is either the mass in the simple pole ansatz m{sub pole} = (1.854 {+-} 0.016 {+-} 0.020) GeV/c{sup 2} or the scale in the modified pole ansatz {alpha}{sub pole} = 0.43 {+-} 0.03 {+-} 0.04. The first error refers to the statistical, the second to the systematic uncertainty.
  • The shape of the hadronic form factor f{sub +}(q{sup 2}) in the decay D{sup 0}{yields}K{sup -}e{sup +}{nu}{sub e} has been measured in a model independent analysis and compared with theoretical calculations. We use 75 fb{sup -1} of data recorded by the BABAR detector at the PEP-II electron-positron collider. The corresponding decay branching fraction, relative to the decay D{sup 0}{yields}K{sup -}{pi}{sup +}, has also been measured to be R{sub D}=B(D{sup 0}{yields}K{sup -}e{sup +}{nu}{sub e}({gamma}))/B(D{sup 0}{yields}K{sup -}{pi}{sup +}({gamma}))=0.927{+-}0.00 = 7{+-}0.012. From these results, and using the present world average value for B(D{sup 0}{yields}K{sup -}{pi}{sup +}), the normalization of the form factor atmore » q{sup 2}=0 is determined to be f{sub +}(0)=0.727{+-}0.007{+-}0.005{+-}0.007 where the uncertainties are statistical, systematic, and from external inputs, respectively.« less
  • The authors report on a search for the rare decay modes B{sup +} {yields} e{sup +}{nu}{sub e} and B{sup +} {yields} {mu}{sup +}{nu}{sub {mu}} with data collected from the BABAR detector at the PEP-II e{sup +}e{sup -} storage ring. This search utilizes a new technique in which they fully reconstruct the accompanying B{sup -} in {Upsilon}(4S) {yields} B{sup +}B{sup -} events, and look for a mono-energetic lepton in B{sup +} rest frame. No signal candidates observed in either of the channels, consistent with the expected background, in a data sample of approximately 229 million B{bar B} pairs. The branching-fraction uppermore » limits are set at {Beta}(B{sup +} {yields} e{sup +}{nu}{sub e}) < 7.9 x 10{sup -6} and {Beta}(B{sup +} {yields} {mu}{sup +}{nu}{sub {mu}}) < 6.2 x 10{sup -6} at the 90% confidence level.« less
  • Based on the measured four-dimensional rate for D{sub s}{sup +} {yields} {phi}e{sup +}{nu}{sub e} decays, they have determined the ratios of the three hadronic form factors, {tau}{sub V} = V(0)/A{sub 1}(0) = 1.636 {+-} 0.067 {+-} 0.038 and {tau}{sub 2} = A{sub 2}(0)/A{sub 1}(0) = 0.705 {+-} 0.056 {+-} 0.029, using a simple pole ansatz for the q{sup 2} dependence, with fixed values of the pole masses for both the vector and axial form factors. By a separate fit to the same data, they have also extracted the pole mass for the axial form factors, m{sub A}: {tau}{sub V} =more » V(0)/A{sub 1}(0) = 1.633 {+-} 0.081 {+-} 0.068, {tau}{sub 2} = A{sub 2}(0)/A{sub 1}(0) = 0.711 {+-} 0.111 {+-} 0.096 and m{sub A} = (2.53{sub -0.35}{sup +0.54} {+-} 0.54)GeV/c{sup 2}.« less
  • A measurement of the ratios of the form factors in the semileptonic decay channelmore » $$D^{\pm} \to K^{0*} e^{\pm} \nu$$ is performed using data collected by the E791 collaboration at the Tagged Photon Spectrometer at Fermilab in a hadroproduction of charm experiment. Charmed events are selected if a secondary vertex of charged tracks is found clearly separated from the primary vertex. Semileptonic events for this particular decay mode are required to have a well identified electron as well as an invariant mass for the ($$K\pi$$) system consistent with the [(*(892) mass. The form factors are extracted by comparing the data to a Monte-Carlo-simulated sample using a continuous maximum-likelihood method to simultaneously fit to four kinematic variables characteristic of this decay mode....« less