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Aspects of strangeness

Description: We review various aspects of strangeness production in relativistic heavy ion collisions from AGS to CERN energies. The experimental data are briefly summarized and various possible theoretical interpretations of these data are evaluated, such as quark-gluon- plasma (QGP), hadron gas (HG) thermal models, or event generators (cascade models). Some comments on the production of strange clusters are offered.
Date: March 1, 1995
Creator: Dover, C. B.
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Partner: UNT Libraries Government Documents Department
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The perturbative resummed series for top production

Description: Our calculation of the total cross section for inclusive production of t{bar t} pairs in hadron collisions is summarized. Principal ingredient of this calculation is resummation of the universal leading-logarithm effect of gluon radiation to all orders in the quantum chromodynamics coupling strength, restricted to the region of phase space that is manifestly perturbative. We present predictions of the physical cross section as a function of top quark mass in proton-antiproton reactions at cente… more
Date: May 2, 1996
Creator: Berger, E. L. & Contopanagos, H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Phenomenological implications of low energy supersymmetry breaking

Description: The experimental signatures for low energy supersymmetry breaking are presented. The lightest standard model superpartner is unstable and decays to its partner plus a Goldstino, G. For a supersymmetry breaking scale below a few 1,000 TeV this decay can take place within a detector, leading to very distinctive signatures. If a neutralino is the lightest standard model superpartner it decays by {chi}{sub 1}{sup 0} {r_arrow} {gamma} + G, and if kinematically accessible by {chi}{sub 1}{sup 0} {r_ar… more
Date: July 1, 1996
Creator: Dimopoulos, S.; Dine, M.; Raby, S.; Thomas, S. & Wells, J.D.
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Partner: UNT Libraries Government Documents Department
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Process Dependent Sivers Function and Implication for Single Spin Asymmetry in Inclusive Hadron Production

Description: We study the single transverse spin asymmetries in the single inclusive particle production within the framework of the generalized parton model (GPM). By carefully analyzing the initial- and final-state interactions, we include the process-dependence of the Sivers functions into the GPM formalism. The modified GPM formalism has a close connection with the collinear twist-3 approach. Within the new formalism, we make predictions for inclusive {pi}{sup 0} and direct photon productions at RHIC en… more
Date: January 1, 2011
Creator: Leonard Gamberg, Zhong-Bo Kang
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Partner: UNT Libraries Government Documents Department
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Clumping Effects on Non-Thermal Particle Spectra in Massive Star Systems

Description: Observational evidence exists that winds of massive stars are clumped. Many massive star systems are known as non-thermal particle production sites, as indicated by their synchrotron emission in the radio band. As a consequence they are also considered as candidate sites for non-thermal high-energy photon production up to gamma-ray energies. The present work considers the effects of wind clumpiness expected on the emitting relativistic particle spectrum in colliding wind systems, built up from … more
Date: November 9, 2007
Creator: Reimer, A. & /Stanford U., HEPL /KIPAC, Menlo Park
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Partner: UNT Libraries Government Documents Department
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Time Structure of Particle Production in the MERIT High-Power Target Experiment

Description: The MERIT experiment is a proof-of-principle test of a target system for high power proton beam to be used as front-end for a neutrino factory complex or amuon collider. The experiment took data in autumn 2007 with the fast extracted beam from the CERN Proton Synchrotron (PS) to a maximum intensity of about 30 x 10{sup 12} protons per pulse. We report results from the portion of the MERIT experiment in which separated beam pulses were delivered to a free mercury jet target with time intervals b… more
Date: May 1, 2009
Creator: Efthymiopoulos, I.; Fabich, A.; Palm, M.; Lettry, J.; Haug, F.; Pereira, H. et al.
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Partner: UNT Libraries Government Documents Department
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A Study of the Average Multiplicity and Multiplicity Distributions in Hadron-Nucleus Collisions at High Energies

Description: In a simple counter experiment requiring about 40 hours of data taking time we propose to study the detailed shape of the multiplicity distribution for larger values of n and the average charged particle multiplicity in hadron-nucleus collisions at 100 and 200 Gev. The results of the experiment should be a valuable input for ccmparison with theoretical models, in particular they should provide a sensitive test ot whether multipartlcle production in hadron-nucleon collisions proceeds through a o… more
Date: June 1, 1972
Creator: Busza, W.; Friedman, J.I.; Kendall, H.W.; Rosenson, L. & /MIT
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Superconducting solenoids for muon-cooling in the neutrino factory

Description: The cooling channel for a neutrino factory consists of a series of alternating field solenoidal cells. The first section of the bunching cooling channel consists of 41 cells that are 2.75-m long. The second section of the cooling channel consists of 44 cells that are 1.65-m long. Each cell consists of a single large solenoid with an average diameter of 1.5 m and a pair of flux reversal solenoids that have an average diameter of 0.7 to 0.9 meters. The magnetic induction on axis reaches a peak va… more
Date: May 12, 2001
Creator: Green, M. A.; Miller, J. R. & Prestemon, S.
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Partner: UNT Libraries Government Documents Department
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Single top production and top properties at the Tevatron

Description: We summarize recent measurements made at the Tevatron Collider using top event candidates. Cross section and mass measurements are discussed in a separate contribution to these Proceedings. Here we report on studies of the top P<sub>T</sub> distribution in t{anti t} production and studies of single top production. Properties of top decays examined are: BF(t {yields} Wb)/BF(t {yields} Wq), helicity amplitudes of W's from top decays and correlations of t{anti t} decay products. Searches for new p… more
Date: November 5, 1999
Creator: Barbaro-Galtieri, Angela
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Partner: UNT Libraries Government Documents Department
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Exotic physics: search for long-lived doubly-charged higgs bosons in p anti-p collisions at s**(1/2) = 1.96 tev

Description: We present a search for long-lived doubly-charged Higgs bosons (H{sup {+-}{+-}}), with signatures of high ionization energy loss and muon-like penetration. We use 292 pb{sup -1} of data collected in p{bar p} collisions at {radical}s = 1.96 TeV by the CDF II detector at the Fermilab Tevatron. Observing no evidence of long-lived doubly-charged particle production, we exclude H{sub L}{sup {+-}{+-}} and H{sub R}{sup {+-}{+-}} bosons with masses below 133 GeV/c{sup 2} and 109 GeV/c{sup 2}, respectiv… more
Date: March 2, 2005
Creator: Acosta, D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Preliminary measurements of the time dependence of B{sub d}{sup 0} - {bar B}{sub d}{sup 0} mixing with kaon and charge dipole tags

Description: We report two preliminary measurements of the time dependence of B{sub d}{sup 0}- B{sub d}{sup 0} mixing using novel techniques with a sample of 150,000 hadronic Z{sup O} decays collected by the SLD experiment at the SLC. B decay vertices are reconstructed inclusively with a topological technique and the B hadron flavor at production is determined by exploiting the large left-right forward-backward asymmetry of Z{sup O} {r_arrow} b {bar b} decays in combination with a jet charge technique. Two … more
Date: July 1, 1996
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Partner: UNT Libraries Government Documents Department
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The inclusive jet cross section at {radical}s = 630 GeV at D0

Description: The authors present a preliminary measurement of the cross section for central inclusive jet production at {radical}s = 630 GeV using {approximately} 400 nb{sup {minus}1} of data collected during the December 1995 Fermilab collider run at D0. These results are compared to NLO QCD predictions.
Date: September 1, 1996
Creator: Krane, J.
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Partner: UNT Libraries Government Documents Department
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Inclusive jet cross section at D0

Description: Preliminary measurement of the central ({vert_bar}{eta}{vert_bar} {<=} 0.5) inclusive jet cross sections for jet cone sizes of 1.0, 0.7, and 0.5 at D{null} based on the 1992-1993 (13.7 {ital pb}{sup -1}) and 1994-1995 (90 {ital pb}{sup -1}) data samples are presented. Comparisons to Next-to-Leading Order (NLO) Quantum Chromodynamics (QCD) calculations are made.
Date: September 1, 1996
Creator: Bhattacharjee, M.
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Partner: UNT Libraries Government Documents Department
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Inclusive dimuon and b-quark production cross sections in p{bar p} collisions at {radical}s = 1.8 TeV

Description: We report on a preliminary measurement of the inclusive dimuon cross section in p{bar p} collisions at {radical}s = 1.8 TeV using the D0 detector at the Fermilab Tevatron. From these results, we extract the inclusive b-quark production cross section for the kinematic range {vert_bar}y{sup b}{vert_bar} < 1.0 and 9 GeV/c < p{sub T}{sup b min} < 25 GeV/c. The difference in azimuthal angle in the transverse plane for dimuon pairs from b{bar b} production is also shown.
Date: July 1, 1995
Creator: Abachi, S.; Abbott, B. & Abolins, M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Results on hard diffraction from CDF

Description: Results on diffractive W-boson and dijet production, selected with a rapidity gap in the forward detector region, are briefly summarized. The new sample of Run 1C data with a Roman Pot trigger has been analyzed for dijet production in single diffraction and double pomeron exchange. Comparisons of diffractive to non-diffractive dijet events are presented.
Date: May 1, 1998
Creator: Borras, K.
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Partner: UNT Libraries Government Documents Department
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Threshold resummation and the total cross section for top quark production

Description: We discuss the motivation for resummation of the effects of initial-state soft gluon radiation, to all orders in the strong coupling strength, for processes in which the near-threshold region in the partonic subenergy is important. We summarize our calculation of the total cross section for top quark production at hadron colliders. Comments are included on the differences between our treatment of subleading logarithmic terms and other methods.
Date: June 12, 1997
Creator: Berger, E. L. & Contopanagos, H.
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Partner: UNT Libraries Government Documents Department
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Searches for supersymmetric particles in p pbar collisions with the D0 detector

Description: We report on searches for supersymmetric particles with the D0 detector at the Fermilab p{ovr p} collider at {radical}s = 1800 GeV. The four searches are: (1) for squarks and gluinos in the jets + missing transverse energy channel, (2) for a light top squark in the jets + missing transverse energy channel, (3) for squarks and gluinos in the dielectron channel, and (4) for charginos and neutralinos in the trilepton channel. The first two searches use data from the 1992- 93 collider run, and the … more
Date: August 1, 1996
Creator: Merritt, W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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MESON2000 Conference Summary

Description: This short contribution is a lite MESON2000 conference summary. As appropriate for the 600th anniversary of the Jagellonian University, it begins with a brief summary of the last 600 years of European history and its place in hadron physics. Next a ''physicist chirality'' order parameter PC is introduced. When applied to MESON2000 plenary speakers this order parameter illustrates the separation of hadron physicists into disjoint communities. The individual plenary talks in MESON2000 are next so… more
Date: April 26, 2001
Creator: Barnes, T.
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Partner: UNT Libraries Government Documents Department
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Observation of Au + Au --&gt; Au + Au + rho(0) and Au + Au --&gt; Au* + Au* + rho(0) with STAR

Description: We report the first observation of the reactions Au + Au {yields} Au + Au + {rho}{sup 0} and Au + Au {yields} Au* + Au* + {rho}{sup 0} with the STAR detector. The {rho} are produced at small perpendicular momentum, as expected if they couple coherently to both nuclei. We discuss models of vector meson production and the correlation with nuclear breakup, and present a fundamental test of quantum mechanics that is possible with the system.
Date: March 10, 2001
Creator: Klein, Spencer
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Partner: UNT Libraries Government Documents Department
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Multiparticle Production at Rhic and Lhc: A Classical Point of View.

Description: We report results of our ongoing nonperturbative numerical study of a classical effective theory describing low-x partons in the central region of a heavy-ion collision. In particular, we give estimates of the initial transverse energies and multiplicities for a wide range of collision regimes, including those at RHIC and at LHC.
Date: October 9, 2000
Creator: Krasnitz, A. & VENUGOPALAN, R.
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Partner: UNT Libraries Government Documents Department
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Scaling between K{sup +} and proton production in nucleus-nucleus collisions

Description: An empirical scaling involving the production of strange particle K{sup +} and protons has been observed at each rapidity over a large range covered by the E-802 spectrometer in reactions from minimum biased p+Be to central Si+Au at 14.6 A-GeV/c. This scaling has implications for the temporal evolution in nucleus-nucleus collisions.
Date: March 1, 1995
Creator: Chen, Ziping & Chasman, C.
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Partner: UNT Libraries Government Documents Department
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