648 research outputs found
Study of D0→Ks0 π+π− and D0→Ks0 K+K− in high energy photoproduction
No full textAnalysis of the resonant and non-resonant branching fractions for the decays D0→KS0π+π−and D0→KS0K+K− is presented. For the D0→KS0π+π− decay, a fit to the observed Dalitz plot was performed to determine the complex amplitudes of the sub-component modes. For the D0→KS0K+K− decay, measurements of the branching ratios D0→KS0K+K− (inclusive), D0→KS0φ, and D0→KS0(K+K−)non-φ relative to the D0→KS0π+π− mode are reported. The data were collected by the Fermilab high energy photoproduction experiment E687
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Hadroproduction of the Iota Meson observed in the K/sub s/K/sub s/. pi. /sup 0/ final state
No full textResults from an experiment studying the C=+1K/sub s/K/sub s/..pi../sup O/ system produced ..pi../sup /minus plus//p interactions at 21.4 GeV/c are presented. It is shown that the structure present in the data between 1.4 and 1.5 GeV/c/sup 2/ has mass and width consistent with the (1460) observed in J//PSI/ radiative decay and most probably has J/sup PC/=O/sup /minus plus//. 19 refs., 7 figs., 1 tab
STUDY OF D(0)->K(S)0-PI+PI- AND D(0)->K(S)0K+K- IN HIGH-ENERGY PHOTOPRODUCTION
No full textAnalysis of the resonant and non-resonant branching fractions for the decays D0→KS0π+π−and D0→KS0K+K− is presented. For the D0→KS0π+π− decay, a fit to the observed Dalitz plot was performed to determine the complex amplitudes of the sub-component modes. For the D0→KS0K+K− decay, measurements of the branching ratios D0→KS0K+K− (inclusive), D0→KS0φ, and D0→KS0(K+K−)non-φ relative to the D0→KS0π+π− mode are reported. The data were collected by the Fermilab high energy photoproduction experiment E687
A wire source deployment system for calibration of the double chooz near detector
No full textElectronic Thesis or DissertationThe reactor neutrino experiment, Double Chooz (DC), observes the electron antineutrino flux from two nuclear reactors located in Chooz, France. Its primary purpose is to measure the neutrino oscillation parameter sin2 2θ13 via inverse beta decay within two functionally identical detectors which utilise a gadolinium doped liquid scintillator active target region. This thesis presents a complete description of the design, construction and installation of the DC near detector radioactive source deployment guide tube (GT) system. During the installation process a photographic and theodolite survey were conducted to determine the precise location of the GT within the detector. Data from both surveys were analysed and compared to obtain a set of coordinates useful for calibration purposes. Post installation, a system verification test was performed to determine the function of the GT. After the first year of successful physics data acquisition using the near detector a calibration campaign was conducted. It was the first time both detectors were calibrated using the GT system. One of several main calibration systems, the GT provides the required accuracy to aid oscillation analyses through the precise knowledge of the energy response and neutron detection efficiency within both detectors. This aids in the minimisation of systematic uncertainties between both detectors
Some lifetimes and branching ratios for charmed hadrons produced in the Fermilab wide band photon beam.
No full textPreliminary values are presented for lifelimes of the Lambdac+ decaying into pK-pi+ and Ds decaying into fi pion. Also presented are preliminary results on samples of
D0 --> K0bar K+ K- , including D0 --> K0bar fi, and D0 --> K0bar pi+pi- decays. The data are
from the first run of Fermilab experiment E687 using the Fermilab Wide-Band Photon
Spectrometer. Our lifetime values are (0.20 +/- 0.03 +/- 0.03) ps for the Lambdac+ and
(0.50 +/- 0.06 +/- 0.03) ps for the Ds+ . We find preliminary values for the branching ratios
B(D0 --> K0bar K+K- )/B(D0 --> K0bar pi+pi- ) and B(D0 --> K0bar fi )/B(D0 --> K0bar pi+ pi- )of
0.20 +/- 0.06 and 0.16 +/- 0.06, respectively; only statistical errors are quoted. Further work is in progress
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Annual report for the High Energy Physics Program at The University of Alabama
No full textThe High Energy Physics group at University of Alabama is a member of the L3 collaboration studying e{sup +}e{sup {minus}} collisions near the Z{degree} pole at the LEP accelerator at CERN. About 2 million Z{degree} events have been accumulated and the experiment has been prolific in publishing results on the Z resonance parameters, the Z couplings to all leptons and quarks with mass less than half the Z mass, searches for new particles and interactions, and studies of strong interactions and/or weak charged current decays of quarks and leptons abundantly produced in Z decays. They are contributing to data analysis as well as to detector hardware. In particular, they are involved in a major hardware upgrade for the experiment, namely the design, construction and commissioning of a Silicon Microvertex Detector (SMD) which has successfully been installed for operation during the present grant period. A report is presented on their recent L3 activities and their plans for the next grant period of twelve months (April 1, 1994--March 31, 1995). Their main interests in data analysis are in the study of single photon final states and the physics made more accessible by the SMD, such as heavy flavor physics. Their hardware efforts continue to be concentrated on the high precision capacitive and optical alignment monitoring systems for the SMD and also includes gas monitoring for the muon system. They are also planning to participate in the coming upgrade of the L3 detector
Semileptonic charmed meson decays.
No full textResults on the semileptonic channels: Do→K+μ−ν+c.c. and D+→K∗oμ+ν+c.c., photoproduced in the E687 experiment at Fermilab, are presented. A preliminary measurement of Γ(Do→K∗−μν)/Γ(D+→K∗oμν) is also discussed
A MEASUREMENT OF ELASTIC J/PSI PHOTOPRODUCTION CROSS-SECTION AT FERMILAB-E687
No full textMeasurements of elastic photoproduction cross sections for the J/psi meson from 100 GeV to 375 GeV are presented. The results indicate that the cross section increases slowly in this range. The shape of the energy dependence agrees well with the photon-gluon fusion model prediction
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