NASA Scientific and Technical Aerospace Reports

will be available for experiments in 2003. The full 192 beam capability of NIF will be available in 2009 and ignition
experiments are expected to begin shortly after that time.
NTIS
Ignition; Ion Beams; Lasers
20040068258 Stanford Linear Accelerator Center, Stanford, CA, USA
First Measurement of the B to Pi Lepton Neutrino and B to Rho(Omega) Lepton Neutrino Branching Fractions
2003; In English
Report No.(s): DE2003-813146; SLAC-PUB-9869; No Copyright; Avail: National Technical Information Service (NTIS)
CLEO has studied B decays to the final states (pi)(ell)(nu),(rho)(ell)(nu), and (omega)(ell)(nu), where (ell)=e or (mu). We
fully reconstruct these modes using a measurement of the missing energy and momentum in each event to infer the neutrino
momentum. With the B(sup 0) and B(sup+) modes combined according to isospin predictions for the relative partial widths,
we obtain (Beta)(B(sup 0)(yields)(pi)(sup -)(ell)(sup+)(nu))=(1.8(+/-) 0.4(+/-) 0.3(+/-) 0.2) x 10(sup -4) and (Beta)(B(sup
0)(yields)(rho)(sup -)(ell)(sup+)(nu))= (2.5(+/-) 0.4(sub 0.7)(sup -.5)(+/-) 0.5) x 10(sup -4), where the errors are statistical,
systematic and the estimated model-dependence. We also estimate (V(sub ub))= (3.3(+/-) 0.2(sub 0.4)(sup+0. 3)(+/-) 0.7) x
10(sup -3).
NTIS
Leptons; Neutrinos; Estimating
20040068259 California Univ., Santa Barbara, CA, USA, California Univ., Lawrence Berkeley National Lab., Berkeley, CA,
USA, California Univ., Irvine, CA, USA
Impact of Tag-Side Interference on Time-Dependent CP Asymmetry Measurements using Coherent B(sup O)(bar
B)(sup O) Pairs
Long, O.; Baak, M.; Cahn, R. N.; Kirby, D.; 2003; In English
Report No.(s): DE2003-812971; SLAC-PUB-9687; No Copyright; Avail: National Technical Information Service (NTIS)
Interference between CKM-favored b(yields) c(bar u)d and doubly-CKM-suppressed (bar b)(yields)(bar u)c(bar d)
amplitudes in final states used for B flavor tagging gives deviations from the standard time evolution assumed in CP-violation
measurements at B factories producing coherent B(sup 0)(bar B)(sup 0) pairs. We evaluate these deviations for the standard
time-dependent CP-violation measurements, the uncertainties they introduce in the measured quantities, and give suggestions
for minimizing them. The uncertainty in the measured CP asymmetry for CP eigenstates is (approx.) 2% or less. The
time-dependent analysis of D*(pi), proposed for measuring sin(2(beta)+(gamma)), must incorporate possible tag-side
interference, which could produce asymmetries as large signal asymmetry.
NTIS
Interference; Impact; Time Dependence; Asymmetry; CP Violation
20040068260 Istituto Nazionale di Fisica Nucleare, Frascati, Italy
Longitudinal Quadrupole Instability and Control in the Frascati DAphiNE Electron Ring
Drago, A.; Gallo, A.; Ghigo, A.; Zobov, M.; 2003; In English
Report No.(s): DE2003-813183; SLAC-PUB-9829; No Copyright; Avail: National Technical Information Service (NTIS)
A longitudinal quadrupole (q-pole) instability was limiting the maximum stable current in the DA(Phi)NE e(sup -) ring
at a level of 700-800 mA. In order to investigate the phenomenon, the instability threshold has been measured as a function
of various machine parameters as radio frequency voltage (V(sub rf)), momentum compaction ((alpha)(sub c)), number of
bunches, fill pattern, etc. An unexpected interaction with the longitudinal feedback system, built to control the dipole motion,
has been found and a proper feedback tuning has allowed increasing the threshold. The maximum stable beam current has now
exceeded 1.80 A and it is no longer limited by the quadrupole instability.
NTIS
Longitudinal Control; Quadrupoles; Feedback Control
20040068263 Lawrence Livermore National Lab., Livermore, CA
Simulation of Time-Reversal Processing for Electromagnetic Communication
Burke, G. J.; Poggio, A. J.; Jul. 25, 2003; In English
Report No.(s): DE2003-15004937; UCRL-ID-154698; No Copyright; Avail: National Technical Information Service (NTIS)
Time-reversal processing was simulated for several possible electromagnetic communication channels, including random
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