111 research outputs found
E835 at FNAL: Charmonium Spectroscopy in Annihilations
I present preliminary results on the search for in its
and decay modes. We observe an excess of \eta_c\gamma{\cal P} \sim 0.001M=3525.8 \pm 0.2 \pm 0.2
\Gamma\leq10.6\pm 3.7\pm3.4(br) <
\Gamma_{\bar{p}p}B_{\eta_c\gamma} < 12.8\pm 4.8\pm4.5(br) J/\psi\pi^0$ mode.Comment: Presented at the 6th International Conference on Hyperons, Charm and
Beauty Hadrons (BEACH 2004), Chicago(Il), June 27-July 3,200
Interference Study of the chi_c0 (1^3P_0) in the Reaction Proton-Antiproton -> pi^0 pi^0
Fermilab experiment E835 has observed proton-antiproton annihilation
production of the charmonium state chi_c0 and its subsequent decay into pi^0
pi^0. Although the resonant amplitude is an order of magnitude smaller than
that of the non-resonant continuum production of pi^0 pi^0, an enhanced
interference signal is evident. A partial wave expansion is used to extract
physics parameters. The amplitudes J=0 and 2, of comparable strength, dominate
the expansion. Both are accessed by L=1 in the entrance proton-antiproton
channel. The product of the input and output branching fractions is determined
to be B(pbar p -> chi_c0) x B(chi_c0 -> pi^0 pi^0)= (5.09 +- 0.81 +- 0.25) x
10^-7.Comment: 4 pages, 4 figures, Accepted by PRL (July 2003
Precision measurements of the total and partial widths of the psi(2S) charmonium meson with a new complementary-scan technique in antiproton-proton annihilations
We present new precision measurements of the psi(2S) total and partial widths
from excitation curves obtained in antiproton-proton annihilations by Fermilab
experiment E835 at the Antiproton Accumulator in the year 2000. A new technique
of complementary scans was developed to study narrow resonances with
stochastically cooled antiproton beams. The technique relies on precise
revolution-frequency and orbit-length measurements, while making the analysis
of the excitation curve almost independent of machine lattice parameters. We
study the psi(2S) meson through the processes pbar p -> e+ e- and pbar p ->
J/psi + X -> e+ e- + X. We measure the width to be Gamma = 290 +- 25(sta) +-
4(sys) keV and the combination of partial widths Gamma_e+e- * Gamma_pbarp /
Gamma = 579 +- 38(sta) +- 36(sys) meV, which represent the most precise
measurements to date.Comment: 17 pages, 3 figures, 3 tables. Final manuscript accepted for
publication in Phys. Lett. B. Parts of the text slightly expanded or
rearranged; results are unchange
Measurement of the two photon decay of the Ïc0(13P0) state of charmonium
AbstractWe report on the decay to two photons of the Ïc0(13P0) charmonium resonance formed in pÌp interactions at Fermilab experiment E835. We have measured the product of branching ratios BR(Ïc0âpÌp)ĂBR(Ïc0âγγ)=(6.52±1.18(stat)+0.48â0.72(sys))Ă10â8. Using values from the 2002 PDG, this measurement leads to the partial width Î(Ïc0âγγ)=2.9±0.9 keV
Measurement of the branching ratios , and
We have measured several branching ratios for decay using the
data collected by FNAL E835 experiment during year 2000, obtaining , , and . We also present a measurement of the
dipion mass distribution in the decays
A Study of \bar{p}p -> Two Neutral Pseudoscalar Mesons at the chi_c0(1^3P_0) Formation Energy
Fermilab experiment E835 has studied reactions \bar{p}p -> pi0 pi0, pi0 eta,
eta eta, pi0 eta' and eta eta' in the energy region of the chi_c0(1^3P_0) from
3340 MeV to 3470 MeV. Interference between resonant and continuum production is
observed in the pi0 pi0 and eta eta channels, and the product of the input and
output branching fractions is measured. Limits on resonant production are set
for the pi0 eta and pi0 eta' channels. An indication of interference is
observed in the eta eta' channel. The technique for extracting resonance
parameters in an environment dominated by continuum production is described.Comment: 15 pages, 21 figures, submitted Phys. Rev.
Measurement of the Resonance Parameters of the and States of Charmonium formed in Antiproton-Proton Annihilations
We have studied the ( states of charmonium in formation by
antiproton-proton annihilations in experiment E835 at the Fermilab Antiproton
Source. We report new measurements of the mass, width, and for the
and by means of the inclusive reaction . Using the subsample of
events where is
fully reconstructed, we derive . We summarize the results of the E760
(updated) and E835 measurements of mass, width and (J=0,1,2) and discuss the significance of
these measurements
Starting point for benchmarking outcomes and reporting of pituitary adenoma surgery within the European Reference Network on Rare Endocrine Conditions (Endo-ERN): results from a meta-analysis and survey study
Objective: The European Reference Network on Rare Endocrine Conditions (Endo-ERN) aims to organize high-quality healthcare throughout Europe, inc luding care for pituitary adenoma patients. As surgery is the mainstay of treatment, we aimed to describe the current surgical practice and published surgical outcomes of pi tuitary adenoma within Endo-ERN.
Design and Methods: Systematic review and meta-analysis of studies reporting surgical outcomes of pituitary adenoma patients within Endo-ERN MTG6 pituitary reference centers between 2010 and 2019. A survey was completed by refere nce centers on their current surgical practice.
Results: A total of 18 out of 43 (42%) reference centers located in 7 of the 20 (35%) MTG6- represented countries published 48 articles. Remission rates we re 50% (95% CI: 42â59) for patients with acromegaly, 68% (95% CI: 60â75) for Cushingâs disease, and 53% (95% CI: 39â66%) for prolactinoma. Gross total resection was achieved in 49% (95% CI: 37â61%) of patients and visual improvement in 78% (95% CI: 68â87). Mort ality, hemorrhage, and carotid injury occurred in less than 1% of patients. New-onset hypopituitarism occurred in 16% (95% CI: 11â23), transient diabetes insipidus in 12% (95 % CI: 6â21), permanent diabetes insipidus in 4% (95% CI: 3â6), syndrome of inappropria te secretion of antidiuretic hormone (SIADH) in 9% (95% CI: 5â14), severe epist axis in 2% (95% CI: 0â4), and cerebrospinal fluid leak in 4% (95% CI: 2â6). Thirty-five (81 %) centers completed the survey: 54% were operated endoscopically and 57% were together with an ENT surgeon.
Conclusion: The results of this study could be used as a first benchmark for the outcomes of pituitary adenoma surgery within Endo-ERN. However, the hete rogeneity between studies in the reporting of outcomes hampers comparability and warrants outcome collection through registries
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