4,406 research outputs found
A Review of Hadronic and Rare B Decays
We review recent experimental results on B meson decays. These include
measurements of the inclusive production of charmed and non-charmed mesons and
baryons, the reconstruction of a large number of exclusive hadronic final
states with charmed mesons, the search for exclusive hadronic final states
without charmed mesons, and the first observation of the decay B-> K* gamma
which is described by an electromagnetic penguin diagram. The theoretical
implications of these results will be considered. The figures can be obtained
in postscript format EMAIL from [email protected]: 77 pages; CLNS 93/1261, UH-511-778-93, OHSTPY-HEP-E-93-018, HEPSY
93-1
CLEO III, A Dectector To Measure Rare Decays and CP Violation
The symmetric collider CESR is undergoing a series of upgrades
allowing for luminosities in excess of cms. The
most important goals of the upgrade are precision measurement of standard model
parameters , , , , and searching for CP
violation and standard model violations in rare decays. A new detector
upgrade, called CLEO III, has started which includes a new silicon-wire drift
chamber tracking system and a Ring Imaging Cherenkov Detector, RICH, using a
LiF radiator and CH-TEA gas based photon detector
Rare b Decays
Rare b decays provide a unique opportunity to measure Standard Model
parameters and probe beyond the Standard Model. We review here the
experimentalprogress made in measuring these decays, and the importance of
future measurements, including the possible observation of CP violation.Comment: To be published in International Journal of Modern Physics Letters A
This is a 34 page review article, the file is uuencoded postscrip
On the use of low-cost computer peripherals for the assessment of motor dysfunction in Parkinson’s disease – Quantification of bradykinesia using target tracking tasks
The potential of computer games peripherals to measure the motor dysfunction in Parkinson’s diseases is assessed. Of particular interest is the quantification of bradykinesia. Previous studies used modified or custom haptic interfaces, here an unmodified force feedback joystick and steering wheel are used with a laptop. During testing an on screen cursor moves in response to movements of the peripheral, the user has to track a continuously moving target (pursuit tracking), or move to a predetermined target (step tracking). All tasks use movement in the horizontal axis, allowing use of joystick or steering wheel. Two pursuit tracking tasks are evaluated, pseudo random movement, and a swept frequency task. Two step tracking tasks are evaluated, movement between two or between two of five fixed targets. Thirteen patients and five controls took part on a weekly basis. Patients were assessed for bradykinesia at each session using standard clinical measures. A range of quantitative measures was developed to allow comparison between and within patients and controls using ANOVA. Both peripherals are capable of discriminating between controls and patients, and between patients with different levels of bradykinesia. Recommendations for test procedures and peripherals are given
Monte Carlo Studies of a Novel LiF Radiator for RICH Detectors
We show that a multifaceted LiF radiator produces more Cherenkov light and
has better resolution per photon than a flat radiator slab when used in a ring
imaging Cherenkov counter. Such a system is being considered for the CLEO III
upgrade.Comment: 9 page
Mutual cosideration of and in supersymmetric SO(10) grand unification
We compare the branching ratios for and
in terms of constraining the parameter space in
supersymmetric SO(10) grand unification models where supersymmetry is broken
softly near the Planck scale by generationally symmetric operators. We observe
two general cases. One with small and the other one with large
having third generation Yukawa coupling unification at the GUT
scale. \newline\indent We show that for small the branching ratio
constraints allow only a smaller region of parameter space for compared
to for gluino mass \alt 500 GeV.
With large , we find acceptable regions of parameter space with
\left|\mu \right|\alt 1 TeV only for . The dominant constraint on
large with parameter space is found to be given by the
branching ratio, while for large with it is found to be given by the branching ratio. In
many of these acceptable regions, we find that the
branching ratio is predicted to be within one order of magnitude of its current
experimental bound. We also show that the usually neglected gluino mediated
diagrams in can not be ignored in some regions of
parameter space, especially for large scenarios when the gluino
mass is near its lower experimental bound.Comment: 14 pages (Latex), 4 PS figs (uuencoded, epsf.tex), slight
modification in text, as to appear in Physics Letters
A Simplified Approach to Determine and the Penguin Amplitude in
The effect of inelastic final-state interactions (IFSI's) on the
determination of the weak phase from the isospin triangles of
is qualitatively illustrated. Neglecting the electroweak
penguins and IFSI's and assuming the dominance of the top-quark loop in strong
penguin diagrams, we propose an experimentally accessible way to approximately
determine and the penguin amplitude in . This
approach relies on a simplified isospin consideration and the factorization
approximation, and its feasibility is irrelevant to the time-dependent
measurements of .Comment: This work has been accepted for publication in Phys. Lett. B. In the
revised version, we add a new section to give a qualitative illustration of
the effect of inelastic final-state interactions on the determination of the
weak phase from the isospin triangles of . 10 Latex
pages (with 1 figure
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