L. M. Cremaldi
University of Colorado Boulder
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Featured researches published by L. M. Cremaldi.
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 D | 1992
J. C. Anjos; A.L. Shoup; M. E. Streetman; C. O. Escobar; M. Souza; Witherell; P. Mantsch; S. McHugh; T.E. Browder; B. R. Kumar; R. J. Morrison; P. Ong; J. E. Duboscq; James Pinfold; M. C. Gibney; M. J. Losty; J. R. Elliott; J.S. Sidhu; A. Santoro; J. A. Appel; W.D. Volkmuth; J. F. Martin; G. F. Hartner; G. Punkar; G. J. Luste; T. Nash; L. M. Cremaldi; A.B. Stundzia; S. Menary; S. B. Bracker
Decays of the [ital D][sup 0] meson to [ital K][sup [minus]][pi][sup +][pi][sup 0] and [ital [bar K]][sup 0][pi][sup +][pi][sup [minus]] and of the [ital D][sup +] to [ital K][sup [minus]][pi][sup +][pi][sup +] have been analyzed for resonant substructure. We present results on the amplitudes and phases of each decay mode and compare the results with other measurements. We confirm the highly nonresonant nature of the [ital D][sup +] to [ital K][sup [minus]][pi][sup +][pi][sup +] decays. There is general agreement with theoretical models for the branching ratios measured.
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.
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 1987
David Bartlett; Sampa Bhadra; L. M. Cremaldi; Alan Duncan; Don Edmonds; James Elliott; Mark Gibney; U. Nauenberg; G. Schultz; Gerd Frank Hartner
Abstract We describe the performance of the Cherenkov counters used in a study of charm photoproduction at Fermilab. We concentrate our discussion on the construction and performance of the Winston cone-phototube elements and the mirrors. We present, based on data from experiment E691, the number of photoelectrons observed in the various cells and discuss in detail the usefulness of these counters in accenting the charm signals.
Physical Review Letters | 1990
J. C. Anjos; J. A. Appel; A. Bean; S. B. Bracker; T.E. Browder; L. M. Cremaldi; J. E. Duboscq; Elliott; C.O. Escobar; 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; A. Santoro; J.S. Sidhu; K. Sliwa; Sokoloff; M. Souza
We have searched for the decay {ital D}{sub {ital s}}{sup +}{r arrow}{phi}{ital e}{sup +}{nu}{sub {ital e}} in data from the Fermilab charm photoproduction experiment E691. The resulting upper limit is {ital B}({ital D}{sub {ital s}}{sup +}{r arrow}{phi}{ital e}{sup +}{nu}{sub {ital e}}){lt}0.45{ital B}({ital D}{sub {ital s}}{sup +}{r arrow}{phi}{pi}{sup +}). Since the branching fraction for {ital D}{sub {ital s}}{sup +}{r arrow}{phi}{ital e}{sup +}{nu}{sub {ital e}} can be calculated from the measured branching fraction {ital B}({ital D}{sup +}{r arrow}{ital {bar K}} {sup *0}{ital e}{sup +}{nu}{sub {ital e}}) to be (1.7{plus minus}0.3)%, this implies a 90%-confidence-level lower limit on {ital B}({ital D}{sub {ital s}}{sup +}{r arrow}{phi}{pi}{sup +}) of 3.4%.
Physical Review Letters | 1990
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; 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; S. Menary; R. J. Morrison; T. Nash; P. Ong; James Pinfold; G. Punkar; M. Purohit; A. Santoro; J.S. Sidhu; K. Sliwa; Sokoloff; M. Souza
We have searched for the decay {ital D}{sub {ital s}}{sup +}{r arrow}{phi}{ital e}{sup +}{nu}{sub {ital e}} in data from the Fermilab charm photoproduction experiment E691. The resulting upper limit is {ital B}({ital D}{sub {ital s}}{sup +}{r arrow}{phi}{ital e}{sup +}{nu}{sub {ital e}}){lt}0.45{ital B}({ital D}{sub {ital s}}{sup +}{r arrow}{phi}{pi}{sup +}). Since the branching fraction for {ital D}{sub {ital s}}{sup +}{r arrow}{phi}{ital e}{sup +}{nu}{sub {ital e}} can be calculated from the measured branching fraction {ital B}({ital D}{sup +}{r arrow}{ital {bar K}} {sup *0}{ital e}{sup +}{nu}{sub {ital e}}) to be (1.7{plus minus}0.3)%, this implies a 90%-confidence-level lower limit on {ital B}({ital D}{sub {ital s}}{sup +}{r arrow}{phi}{pi}{sup +}) of 3.4%.
