3,407 research outputs found
A Novel Scheme to Search for Fractional Charge Particles in Low Energy Accelerator Experiments
In the Standard Model of particle physics, the quarks and anti-quarks have
fractional charge equal to or of the electron's charge. There
has been a large number of experiments searching for fractional charge,
isolatable, elementary particles using a variety of methods, including
collisions using dE/dx ionization energy loss measurements, but no evidence has
been found to confirm existence of free fractional charge particles, which
leads to the quark confinement theory. In this paper, a proposal to search for
this kind particles is presented, which is based on the conservation law of
four-momentum. Thanks to the CLEOc and BESIII detectors' large coverage, good
particle identification, precision measurements of tracks' momenta and their
large recorded data samples, these features make the scheme feasible in
practice. The advantage of the scheme is independent of any theoretical models
and sensitive for a small fraction of the quarks transitioning to the
unconfinement phase from the confinement phase.Comment: 9 page
Zones inondables : l'expertise, la règle et la concertation.
De 1994 à 1999, la Mission Eau et Rivières du Parc naturel régional du Luberon s'est investie dans une démarche baptisée EFPI : Etude du fonctionnement physique et de l'inondabilité du bassin versant du Calavon. D'abord programme d'étude, elle s'est éten
First determination of the content of and updated determination of the contents of and
Quantum-correlated decays collected by the CLEO-c
experiment are used to perform a first measurement of , the
fractional -even content of the self-conjugate decay , obtaining a value of . An important
input to the measurement comes from the use of
and decays to tag the signal mode. This same
technique is applied to the channels and , yielding and
, where the first uncertainty is
statistical and the second systematic. These measurements are consistent with
those of an earlier analysis, based on -eigenstate tags, and can be
combined to give values of and
. The results will enable the three modes to
be included in a model-independent manner in measurements of the unitarity
triangle angle using decays, and in time-dependent
studies of violation and mixing in the system.Comment: Minor revisions following journal acceptanc
New Source of CP violation in B physics ?
In this talk we discuss how the down type left-right squark mixing in
Supersymmetry can induce a new source of CP violation in the time dependent
asymmtries in B --> phi K process. We use QCD improved factorization process to
calculate the hadronic matrix element for the process and find the allowed
parameter space for and , the magnitude and phase of the down
type LR(RL) squark mixing parameter . In the same allowed
regin we calculate the expected CP asymmtries in the
process.Comment: 16 pages, Latex, 2 postscript figures, invited talk presented by N.G.
Deshpande at the 9th Adriatic meeting, Dubrovnik, Croatia, 4-14 September,
2003. With updated reference
Enzymatic profile of myocardial infarct
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/33419/1/0000821.pd
First determination of the CP content of D->pi+pi-pi0 and D->K+K-pi0
Quantum-correlated psi(3770)->DDbar decays collected by the CLEO-c experiment
are used to perform first measurements of F+, the fractional CP-even content of
the self-conjugate decays D->pi+pi-pi0 and D->K+K-pi0. Values of 0.968 +/-
0.017 +/- 0.006 and 0.731 +/- 0.058 +/- 0.021 are obtained for pi+pi-pi0 and
K+K-pi0, respectively. It is demonstrated how modes of this sort can be cleanly
included in measurements of the unitarity triangle angle gamma using B+/- -> D
K+/- decays. The high CP-even content of D -> pi+pi-pi0, in particular, makes
this a promising mode for improving the precision on gamma.Comment: 18 pages, 4 figures, submitted to Phys. Lett.
Analysis of B-> \phi K Decays in QCD Factorization
We analyze the decay within the framework of QCD-improved
factorization. We found that although the twist-3 kaon distribution amplitude
dominates the spectator interactions, it will suppress the decay rates
slightly. The weak annihilation diagrams induced by penguin
operators, which are formally power-suppressed by order , are
chirally and logarithmically enhanced. Therefore, these annihilation
contributions are not subject to helicity suppression and can be sizable. The
predicted branching ratio of is in
the absence of annihilation contributions and it becomes
when annihilation effects are taken into
account. The prediction is consistent with CLEO and BaBar data but smaller than
the BELLE result.Comment: 13 pages, 3 figures. A major change for the presentation of
branching-ratio predictions. Experimental data are update
Science results from the imaging Fourier transform spectrometer SpIOMM
SpIOMM is an imaging Fourier transform spectrometer designed to obtain the
visible range (350 to 850 nm) spectrum of every light source in a circular
field of view of 12 arcminutes in diameter. It is attached to the 1.6-m
telescope of the Observatoire du Mont Megantic in southern Quebec. We present
here some results of three successful observing runs in 2007, which highlight
SpIOMMs capabilities to map emission line objects over a very wide field of
view and a broad spectral range. In particular, we discuss data cubes from the
planetary nebula M27, the supernova remnants NGC 6992 and M1, the barred spiral
galaxy NGC7479, as well as Stephans quintet, an interacting group of galaxies.Comment: 10 pages, 7 figures, to appear in "Ground-based and Airborne
Instrumentation for Astronomy II", SPIE conference, Marseille, 23-28 June
200
New determination of the D0→K−π+π0 and D0→K−π+π+π− coherence factors and average strong-phase differences
AbstractMeasurements of the coherence factors (RKππ0 and RK3π) and the average strong-phase differences (δDKππ0 and δDK3π) for the decays D0→K−π+π0 and D0→K−π+π+π− are presented. These parameters are important inputs to the determination of the unitarity triangle angle γ in B∓→DK∓ decays, where D designates a D0 or D¯0 meson decaying to a common final state. The measurements are made using quantum correlated DD¯ decays collected by the CLEO-c experiment at the ψ(3770) resonance, and augment a previously published analysis by the inclusion of new events in which the signal decay is tagged by the mode D→KS0π+π−. The measurements also benefit from improved knowledge of external inputs, namely the D0D¯0 mixing parameters, rDKπ and several D-meson branching fractions. The measured values are RKππ0=0.82±0.07, δDKππ0=(164−14+20)°, RK3π=0.32−0.28+0.20 and δDK3π=(225−78+21)°. Consideration is given to how these measurements can be improved further by using the larger quantum-correlated data set collected by BESIII
Determination of quark-antiquark component of the photon wave function for u, d, s quarks
Based on the data for the transitions pi0, eta, eta' -> gamma gamma^*(Q^2)
and reactions of the e^+ e^- -annihilations, e^+ e^- -> rho0, omega, phi and
e^+ e^--> hadrons at 1<E_{e^+e^-}<3.7 GeV, we determine the light-quark
components of the photon wave function gamma^*(Q^2) -> q anti-q (q= u, d, s)
for the region 0< Q^2 <1 (GeV/c)^2.Comment: 17 pages, some typos correcte
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