55 research outputs found
Search for the exotic Resonance in 340GeV/c -Nucleus Interactions
We report on a high statistics search for the resonance in
-nucleus collisions at 340GeV/c. No evidence for this resonance is
found in our data sample which contains 676000 candidates above
background. For the decay channel and the
kinematic range 0.150.9 we find a 3 upper limit for the
production cross section of 3.1 and 3.5 b per nucleon for reactions with
carbon and copper, respectively.Comment: 5 pages, 4 figures, modification of ref. 43 and 4
Measurement of the Omega_c Lifetime
We present the measurement of the lifetime of the Omega_c we have performed
using three independent data samples from two different decay modes. Using a
Sigma- beam of 340 GeV/c we have obtained clean signals for the Omega_c
decaying into Xi- K- pi+ pi+ and Omega- pi+ pi- pi+, avoiding topological cuts
normally used in charm analysis. The short but measurable lifetime of the
Omega_c is demonstrated by a clear enhancement of the signals at short but
finite decay lengths. Using a continuous maximum likelihood method we
determined the lifetime to be tau(Omega_c) = 55 +13-11(stat) +18-23(syst) fs.
This makes the Omega_c the shortest living weakly decaying particle observed so
far. The short value of the lifetime confirms the predicted pattern of the
charmed baryon lifetimes and demonstrates that the strong interaction plays a
vital role in the lifetimes of charmed hadrons.Comment: 15 pages, including 7 figures; gzipped, uuencoded postscrip
Search for the pentaquark candidate (1540) in the hyperon beam experiment WA89
We report on a high-statistics search for the \t1540 resonance in
-nucleus collisions at 340 \gevc1 . No evidence for this resonance
was found in our data sample which contains 13 millions
decays above background. For the decay channel and the
kinematic range 0.05 we find the production cross section to be
1.8 b per nucleon at 99% CL.Comment: 5 pages, 4 figure
Charge Asymmetries for D, D_s and Lambda_c Production in Sigma- - Nucleus Interactions at 340 GeV/c
CERN experiment WA89 has studied charmed particles produced by a Sigma^- beam
at 340 GeV/c on nuclear targets. Production of particles which have light
quarks in common with the beam is compared to production of those which do not.
Considerable production asymmetries between D^- and D^p, D_s^ and D_s^+ and
Lambda_c and Antilambda_c are observed. The results are compared with pion beam
data and with theoretical calculations.Comment: LaTeX ; 16 pages including 4 ps figure
Une pratique funéraire atypique pour l’âge du Bronze final en Lorraine (France)
National audienc
Plasminogen glycoforms alteration and activation susceptibility associated with the missense variant p.Lys330Glu in HAE-PLG patients
[No abstract available
A metric space for Type Ia supernova spectra: a new method to assess explosion scenarios
Synthesis, structure and anticancer activity of three platinum(II) complexes with 2-phenylpyridine derivatives
Kininogen Cleavage Assay: Diagnostic Assistance for Kinin-Mediated Angioedema Conditions
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