120460046
K0 Phenomena Associated with Neutrino Induced mu- e+ Events.
Using the Fermilab 15-ft neon-hydrogen bubble chamber we have identified seventeen events of the type ..nu../sub ..mu../N ..-->.. ..mu../sup -/e/sup +/X. The ratio of the production of these events to ordinary neutrino charged-current events is (7.7 +- 3.0) x 10/sup -3/ for positron energy greater than 800 MeV and neutrino energy greater than 10 GeV. Associated with these seventeen events are 11 V's, of which eight fit K/sub s//sup 0/ ..-->.. ..pi../sup +/..pi../sup -/ and three fit K/sub s//sup 0/ ..-->.. ..pi../sup +/..pi../sup -/ and ..lambda.. ..-->.. p..pi../sup -/ ambiguously. The average K/sup 0/ multiplicity per ..mu../sup -/e/sup +/ event is determined to be 1.84/sup +0.63//sub -0.53/.
123029644
Observation of short-lived particles produced in high energy neutrino interactions
Abstract Examination of a sample of 89 high-energy, neutrino-induced dilepton events produced in the Fermilab 15 ft bubble chamber has resulted in the direct observation of the production and visible semi-leptonic decay of short-lived particles. One charged decay, two neutral decays, and one decay candidate of undetermined charge are found. Assuming these events and the remaining dilepton signal result from D meson decays, we obtain τ D + = 2.5 −1.5 +3.5 × 10 −13 s and τ D 0 = 3.5 −1.7 +3.5 × 10 −13 s, using a maximum likelihood analysis.
125826043
Study of Hadronic Systems Produced in electron-neutrino (anti-electron-neutrino) n e Interactions
125143796
An Exposure of the 15 foot bubble chamber with a neon - hydrogen mixture to a wideband neutrino beam from the Tevatron
120839233
Search for high-energy tau-neutrino interactions
Kinematic selection criteria are developed for separating tau-neutrino charged-current interactions from a large background of muon- and electron-neutrino interactions. The criteria are designed to detect the three-prong decay mode of the $\ensuremath{\tau}$ lepton and rely on the three-particle combination's transverse momentum being anticorrelated with the tr\'ansverse momentum of the other visible particles and being correlated with the missing transverse momentum. The criteria are applied to a sample of events from an exposure of the Fermilab 15-ft bubble chamber to the quadrupole triplet neutrino beam. The average event energies for this beam are 90 GeV for neutrino and 60 GeV for antineutrino events. The $14 \ensuremath{\tau}$ candidates selected agree with the calculated background of 14.3\ifmmode\pm\else\textpm\fi{}1.2. An upper limit on the probability of muon neutrinos oscillating into tau neutrinos of 0.053 is obtained.
124266533
Observation of mu e Events in anti-neutrino and Neutrino Interactions in the Fermilab 15-Foot Neon-H Bubble Chamber
55511901
Analyzing powers for the inclusive reaction of deuterons on carbon at energies between 0.175 and 1.6 GeV
Abstract The results of a new calibration of the polarimeter POMME for energies between 0.175 and 1.6 GeV, using the polarized deuteron beam of the Laboratoire National Saturne, are reported. The present calibration, together with previous ones, gives a complete set of vector analyzing powers in the energy range 0.175–1.8 GeV. The vector analyzing powers are fitted as a function of energy and scattering angle, with empirical formulae. Two sets of parameters are given, one for deuteron energies between 0.175 and 0.575 GeV, and the other in an energy range between 0.7 and 1.8 GeV.
106619516
Influence of luminosity leveling on the CDF-II B-Physics program
The effective bandwidth of the CDF-II level 1 trigger is approximately 25 kHz. Some of this bandwidth is used to record events that form the data sets used by the high p{sub T} physics analyses. The remaining bandwidth is used by triggers that are sensitive to hadronic B decays and provide one of the most important samples used for the study of B{sub s}{sup 0} mixing. At high luminosities, the hadronic B triggers have rates that greatly exceed the available bandwidth. Rather than incur large dead-times associated with these excessive rates, these B triggers are prescaled to limit the total trigger rate to the effective level 1 trigger bandwidth. The prescales are dynamically adjusted as the store progresses so that all of the bandwidth that is not used for the high p{sub T} physics program is used to record hadronic B triggers. In principle, the luminosity could be held at a more constant level throughout the store in such a way that the integrated luminosity would be the same as that obtained from a normal store. It has been suggested that this would allow B triggers to be recorded with lower prescales and consequently with higher B{sub s}{sup 0} signal efficiencies. This note describes a parametric model of the high p{sub T} and hadronic B triggers used by CDF and compares the yields of reconstructed B{sub s}{sup 0} decays that would result with and without luminosity leveling.
117922116
Measurement of analyzing powers for the reaction p(pol.) + ch-2 at p(p) = 1.75-GeV/c - 5.3-GeV/c
Abstract We report a new measurement of analyzing powers for the reaction p ⇒ + CH 2 → one charged particle +X, at proton momenta of 1.75, 3.8, 4.5 and 5.3 GeV / c . These results extend the existing data basis, necessary for proton polarimetry at intermediate energy, and confirm the feasibility of a large acceptance polarimeter based on this process. Particular attention was devoted to the investigation of the optimal target thickness and of the useful angular range. The experiment is performed at the accelerator complex of the JINR-VBLHE (Dubna).
103266766
Binding energy of (Lambda)He-7 and test of charge symmetry breaking in the Lambda N interaction potential
The binding energy of 7ΛHe has been obtained for the first time with reaction spectroscopy using the (e, e'K+) reaction at Jefferson Lab's Hall C. A comparison among the binding energies of the A = 7 T = l iso-triplet hypernuclei, 7ΛHe, 7ΛLi*and 7ΛBe, is made and possible charge symmetry breaking (CSB) in the ΛN potential is discussed. For 7ΛHe and 7ΛBe, the shifts in binding energies are opposite to those predicted by a recent cluster model calculation, which assumes that the unexplained part of the binding energy difference between 4ΛH and 4ΛHe, is due to the CSB of the ΛN potential. Further examination of CSB in light hypernuclear systems is required both experimentally and theoretically.
120304679
Nucleon form-factors using spin degrees of freedom
An overview of recent measurements of the neutron and proton electromagnetic form factors from double polarization experiments. Spin observables are sensitive to the product of nucleon form factor which allows access to the small nucleon electric form factors.