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Featured researches published by P. Estabrooks.
Physical Review Letters | 1989
J. C. Anjos; J. A. Appel; A. Bean; S. B. Bracker; T.E. Browder; L. M. Cremaldi; J. E. Duboscq; Elliott; C.O. Escobar; P. Estabrooks; M. C. Gibney; G. F. Hartner; P. E. Karchin; B. R. Kumar; M. J. Losty; G. J. Luste; P. Mantsch; J. F. Martin; S. McHugh; Menary; R. J. Morrison; T. Nash; P. Ong; James Pinfold; G. Punkar; M. Purohit; Raab; A. Santoro; J.S. Sidhu; K. Sliwa
We present an analysis of the exclusive semileptonic decay mode D/sup 0/ ..-->.. K/sup -/e/sup +/nu/sub e/. We have measured the ratio of decay rates GAMMA(D/sup 0/ ..-->.. K/sup -/e/sup +/nu/sub e/)/GAMMA(D/sup 0/ ..-->.. K/sup -/..pi../sup +/). After correcting for the reconstruction efficiencies and subtracting the contribution from other decay modes we have found the ratio to be equal to 0.77 +- 0.12(stat) +- 0.13(syst).
Physical Review Letters | 1989
J. C. Anjos; J. A. Appel; A. Bean; S. B. Bracker; T.E. Browder; L. M. Cremaldi; Elliott; C.O. Escobar; P. Estabrooks; M. C. Gibney; G. F. Hartner; P. E. Karchin; B. R. Kumar; M. J. Losty; G. J. Luste; P. Mantsch; J. F. Martin; S. McHugh; Menary; R. J. Morrison; T. Nash; P. Ong; James Pinfold; G. Punkar; M. Purohit; Raab; A. Santoro; J.S. Sidhu; K. Sliwa; Sokoloff
Using the data from Fermilab experiment 691, we have observed signals for the decays D/sub s//sup +- / and D/sup +- /..--> pi../sup -/..pi../sup +/..pi../sup +- / and have analyzed these modes for the fraction due to rho/sup 0/..pi../sup +- / and f/sub 0/(975)..pi../sup +- /. In addition, we have searched for the decays D/sub s//sup +- / and D/sup +- /..--> pi../sup -/..pi../sup +/..pi../sup -/..pi../sup +/..pi../sup +- /. Values or upper limits are reported for the relative branching fractions for all of the above decays.
Physical Review Letters | 1989
J. C. Anjos; J. A. Appel; A. Bean; S. B. Bracker; T.E. Browder; L. M. Cremaldi; J. E. Duboscq; Elliott; C.O. Escobar; P. Estabrooks; M. C. Gibney; G. F. Hartner; P. E. Karchin; B. R. Kumar; M. J. Losty; G. J. Luste; P. Mantsch; J. F. Martin; S. McHugh; Menary; R. J. Morrison; T. Nash; P. Ong; James Pinfold; G. Punkar; M. Purohit; Raab; A. Santoro; J.S. Sidhu; K. Sliwa
The decay D/sup +/..-->..K/sup -/..pi../sup +/e/sup +/..nu../sub e/ has been studied in the Fermilab photoproduction experiment E691. The ratio of branching ratios, B(D/sup +/..-->..K-bar/sup *//sup 0/e/sup +/..nu../sub e/)/B (D/sup +/..-->..K/sup -/..pi../sup +/..pi../sup +/), is found to be 0.49 +- 0.04 +- 0.05, corresponding to a D/sup +/..-->..K-bar/sup *//sup 0/e/sup +/..nu../sub e/ branching ratio of (4.5 +- 0.7 +- 0.5)%. The branching ratio to the nonresonant (K/sup -/..pi../sup +/)/sub NR/e..nu../sub e/ final state is found to be less than 0.7% at the 90% confidence level. The K/sup *//sup 0/ mesons have a ratio of longitudinal to transverse polarization of 2.4/sub -0.9//sup +1.7/ +- 0.2. .AE
Physical Review Letters | 1989
J. C. Anjos; J. A. Appel; A. Bean; S. B. Bracker; T.E. Browder; L. M. Cremaldi; J. E. Duboscq; J. R. Elliott; C.O. Escobar; P. Estabrooks
The decay D/sup +/..-->..K/sup -/..pi../sup +/e/sup +/..nu../sub e/ has been studied in the Fermilab photoproduction experiment E691. The ratio of branching ratios, B(D/sup +/..-->..K-bar/sup *//sup 0/e/sup +/..nu../sub e/)/B (D/sup +/..-->..K/sup -/..pi../sup +/..pi../sup +/), is found to be 0.49 +- 0.04 +- 0.05, corresponding to a D/sup +/..-->..K-bar/sup *//sup 0/e/sup +/..nu../sub e/ branching ratio of (4.5 +- 0.7 +- 0.5)%. The branching ratio to the nonresonant (K/sup -/..pi../sup +/)/sub NR/e..nu../sub e/ final state is found to be less than 0.7% at the 90% confidence level. The K/sup *//sup 0/ mesons have a ratio of longitudinal to transverse polarization of 2.4/sub -0.9//sup +1.7/ +- 0.2. .AE
Physical Review D | 1988
J.R. Raab; James Pinfold; M. E. Streetman; P. Estabrooks; C.O. Escobar; M. Souza; S. McHugh; T.E. Browder; B. R. Kumar; Richard J. S. Morrison; P. Ong; W. J. Spalding; J. C. Anjos; M. C. Gibney; M. J. Losty; U. Nauenberg; J. R. Elliott; J.S. Sidhu; A. Santoro; S. Menary; Stephen B. Bracker; M. S. Witherell; J. A. Appel; J.F. Martin; G. F. Hartner; G. Punkar; G. J. Luste; T. Nash; L. M. Cremaldi; A.B. Stundzia
We have measured the lifetimes of the D/sup 0/, D/sup +/, and D/sub s//sup +/ mesons which were produced by a high-energy photon beam incident on beryllium. Using the Fermilab Tagged Photon Spectrometer with a silicon-microstrip vertex detector we have collected 10/sup 8/ events from which we have extracted about 4200 D/sup 0/ decays in the K/sup -/..pi../sup +/ and K/sup -/..pi../sup +/..pi../sup -/..pi../sup +/ modes, 3000 D/sup +/ into the K/sup -/..pi../sup +/..pi../sup +/ channel, and a total of 230 D/sub s//sup +/ into phi..pi../sup +/ and K-bar/sup *//sup 0/K/sup +/. From an analysis of these events we have determined the lifetimes for the D/sup 0/, D/sup +/, and D/sub s//sup +/ to be 0.422 +- 0.008 +- 0.010, 1.090 +- 0.030 +- 0.025, and 0.47 +- 0.04 +- 0.02 psec, respectively
Physical Review Letters | 1989
J. C. Anjos; J. A. Appel; A. Bean; S. B. Bracker; T.E. Browder; L. M. Cremaldi; J. R. Elliott; C.O. Escobar; P. Estabrooks; M. C. Gibney
Using the data from Fermilab experiment 691, we have observed signals for the decays D/sub s//sup +- / and D/sup +- /..--> pi../sup -/..pi../sup +/..pi../sup +- / and have analyzed these modes for the fraction due to rho/sup 0/..pi../sup +- / and f/sub 0/(975)..pi../sup +- /. In addition, we have searched for the decays D/sub s//sup +- / and D/sup +- /..--> pi../sup -/..pi../sup +/..pi../sup -/..pi../sup +/..pi../sup +- /. Values or upper limits are reported for the relative branching fractions for all of the above decays.
Physical Review D | 1988
J.R. Raab; J.C. Anjos; J. A. Appel; S. B. Bracker; T.E. Browder; L. Cremaldi; J. R. Elliott; C. O. Escobar; P. Estabrooks; M.C. Gibney
We have measured the lifetimes of the D/sup 0/, D/sup +/, and D/sub s//sup +/ mesons which were produced by a high-energy photon beam incident on beryllium. Using the Fermilab Tagged Photon Spectrometer with a silicon-microstrip vertex detector we have collected 10/sup 8/ events from which we have extracted about 4200 D/sup 0/ decays in the K/sup -/..pi../sup +/ and K/sup -/..pi../sup +/..pi../sup -/..pi../sup +/ modes, 3000 D/sup +/ into the K/sup -/..pi../sup +/..pi../sup +/ channel, and a total of 230 D/sub s//sup +/ into phi..pi../sup +/ and K-bar/sup *//sup 0/K/sup +/. From an analysis of these events we have determined the lifetimes for the D/sup 0/, D/sup +/, and D/sub s//sup +/ to be 0.422 +- 0.008 +- 0.010, 1.090 +- 0.030 +- 0.025, and 0.47 +- 0.04 +- 0.02 psec, respectively
Physical Review Letters | 1989
J. C. Anjos; J. A. Appel; A. Bean; S. B. Bracker; T.E. Browder; L. M. Cremaldi; Elliott; C.O. Escobar; P. Estabrooks; M. C. Gibney; G. F. Hartner; P. E. Karchin; B. R. Kumar; M. J. Losty; G. J. Luste; P. Mantsch; J. F. Martin; S. McHugh; Menary; R. J. Morrison; T. Nash; U. Nauenberg; P. Ong; James Pinfold; G. Punkar; M. Purohit; Raab; A. Santoro; J.S. Sidhu; K. Sliwa
Using a sample of approximately 120..lambda../sub /ital c///sup +//r arrow//ital pK//sup /minus//..pi../sup +/ decays reconstructedin photoproduction experiment E691 at Fermilab, we have searched for..sigma../sub /ital c// production and decay into ..lambda../sub /ital c//..pi... A signal of14+-4 ..sigma../sub /ital c///sup 0/ decays is observed. The..sigma../sub /ital c///sup 0/-..lambda../sub /ital c///sup +/ mass difference is measuredto be 168.4+-1.0+-0.3 MeV//ital c//sup 2/. We also report on therelative fraction of ..sigma../sub /ital c// production as compared to inclusive..lambda../sub /ital c// production at an average photon energy of 145 GeV.
Physical Review Letters | 1989
J. C. Anjos; J. A. Appel; A. Bean; S. B. Bracker; T.E. Browder; L. M. Cremaldi; J. R. Elliott; C.O. Escobar; P. Estabrooks; M. C. Gibney
Using a sample of approximately 120..lambda../sub /ital c///sup +//r arrow//ital pK//sup /minus//..pi../sup +/ decays reconstructedin photoproduction experiment E691 at Fermilab, we have searched for..sigma../sub /ital c// production and decay into ..lambda../sub /ital c//..pi... A signal of14+-4 ..sigma../sub /ital c///sup 0/ decays is observed. The..sigma../sub /ital c///sup 0/-..lambda../sub /ital c///sup +/ mass difference is measuredto be 168.4+-1.0+-0.3 MeV//ital c//sup 2/. We also report on therelative fraction of ..sigma../sub /ital c// production as compared to inclusive..lambda../sub /ital c// production at an average photon energy of 145 GeV.
Physical Review Letters | 1989
J. C. Anjos; J. A. Appel; A. Bean; S. B. Bracker; T.E. Browder; L. M. Cremaldi; J. E. Duboscq; J. R. Elliott; C.O. Escobar; P. Estabrooks
We present an analysis of the exclusive semileptonic decay mode D/sup 0/ ..-->.. K/sup -/e/sup +/nu/sub e/. We have measured the ratio of decay rates GAMMA(D/sup 0/ ..-->.. K/sup -/e/sup +/nu/sub e/)/GAMMA(D/sup 0/ ..-->.. K/sup -/..pi../sup +/). After correcting for the reconstruction efficiencies and subtracting the contribution from other decay modes we have found the ratio to be equal to 0.77 +- 0.12(stat) +- 0.13(syst).
