239 research outputs found
History of exotic Meson (4-quark) and Baryon (5-quark) States
I briefly review the history of exotic meson (4-quark) and baryon (5-quark)
states, which is rooted in the formalism of Regge pole and duality. There are
robust model-independent predictions for the exchange of 4-quark (Baryonium)
Regge trajectories in several processes, which are strongly supported by
experiment. On the other hand the predictions for the spectroscopy of 4-quark
resonances are based on specific QCD inspired models, with some experimental
support. The corresponding predictions for the recently discovered exotic
baryon (Pentaquark) state are briefly discussed.Comment: 14 pages Latex including 4 eps figures, final version to appear as a
topical review in J. Phys.
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MPI-2: Extending the Message-Passing Interface
This paper describes current activities of the MPI-2 Forum. The MPI - 2 Forum is a group of parallel computer vendors, library writers, and application specialists working together to define a set of extensions to MPI (Message Passing Interface). MPI was defined by the same process and now has many implementations, both vendor- proprietary and publicly available, for a wide variety of parallel computing environments. In this paper we present the salient aspects of the evolving MPI-2 document as it now stands. We discuss proposed extensions and enhancements to MPI in the areas of dynamic process management, one-sided operations, collective operations, new language binding, real-time computing, external interfaces, and miscellaneous topics
Prospects for Pentaquark Searches in Annihilations and Collisions
Recent strong experimental evidence of a narrow exotic S = +1 baryon
resonance, , suggests the existence of other exotic baryons. We
discuss the prospects of confirming earlier experimental evidence of
and the observation of additional hypothetical exotic baryons in
annihilations and collisions at LEP and B Factories
Increased frequency and nocturia in a middle aged male may not always be due to Benign Prostatic Hypertrophy (BPH): a case report
Primary signet ring cell carcinoma of urinary bladder is a rare type of bladder tumor and carries a very high mortality rate. It may have a clinical presentation similar to common diseases like Benign Prostatic Hypertrophy (BPH) and the management options are extremely limited. We report a case of 58 year old Caucasian male who presented with a 5 month history of increased frequency of urination, nocturia and weight loss without any fever or hematuria. He was found to have an increased creatinine of 2.8 mg/dl and a prostate specific antigen level of 0.18 ng/ml. His azotemia was thought to be secondary to BPH. A foley catheter was initially placed with a plan for outpatient follow up. On removal of the catheter his problems persisted and he returned to the hospital. Diagnostic work up including abdominal ultrasonography, computed tomography (CT) scan, retrograde pyelogram, cystography and cystoscopic biopsies revealed the diagnosis of primary signet ring cell carcinoma of urinary bladder. Although cystectomy was planned, our patient passed away before this could be done
Antikaon angular distributions in the reaction near the threshold and the parity of the pentaquark
Within spectator model we study the reaction in the threshold energy region. We present the predictions for
the exclusive and inclusive antikaon angular distributions in the laboratory
system for this reaction calculated for two possible parity states of the
resonance at 1.5 and 1.75 GeV beam energies with and without
imposing the relevant kinematical cuts on those parts of the sampled phase
space where contribution from the main background sources associated with the
, production as well as with the
--rescattering in the final state, is expected to be dominant. We show
that under chosen kinematics these distributions are sensitive to the
parity and, therefore, can be used as a filter for the
determination of its parity.Comment: 18 pages, 8 figures; will be published in Phys.Atom.Nucl_4_200
Moments of inertia, nucleon axial-vector coupling, the {\bf 8}, {\bf 10}, and mass spectrums and the higher SU(3)_f representation mass splittings in the Skyrme model
The broad importance of a recent experimental discovery of pentaquarks
requires more theoretical insight into the structure of higher representation
multiplets. The nucleon axial-vector coupling, moments of inertia, the {\bf 8},
{\bf 10}, , and absolute mass spectra and the
higher SU(3) representation mass splittings for the multiplets ,
, , , , , and are computed in the framework of the minimal extended
Skyrme model by using only one free parameter, i.e., the Skyrme charge . The
analysis presented in this paper represents simple and clear theoretical
estimates, obtained without using any experimental results for higher
(,...) multiplets. The obtained results are in good agreement
with other chiral soliton model approaches that more extensively use
experimental results as inputs.Comment: 22 pages, 12 figures, 9 tables, version accepted in JHE
Evaluation of a national high school entertainment education program: The Alliance for Climate Education
Minimal axillary lymph node involvement in breast cancer has different prognostic implications according to the staging procedure
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