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Bose-Einstein correlations in e/sup +/e/sup -/ collisions

Description: The MARK II detector is used to study the Bose-Einstein correlation between pairs and triplets of charged pions produced in hadronic decays of the J)psi), the ..sqrt..s = 4 to 7 GeV continuum above the J)psi), two photon events at ..sqrt..s = 29 GeV, and e/sup )plus/)e/sup )minus/) annihilation events at ..sqrt..s = 29 GeV as a function of Q/sup 2/, the four-momentum transfer squared. After corrections for Coulomb effects and pion misidentification, we find a nearly full Bose-Einstein enhanceme… more
Date: December 1, 1987
Creator: Juricic, I.
Partner: UNT Libraries Government Documents Department
open access

On a quasi-isochronous B Factory in the PEP tunnel

Description: Isochronous, or quasi-isochronous storage rings with very small momentum compaction factor {alpha} for various applications are discussed. This approach looks very promising for the B-Factory design. A small momentum compaction factor reduces the bunch length at the given RF voltage. A small bunch length allows, in principle, reduction of the beta function at the interaction point (IP) with a corresponding increase of the luminosity. However, achieving this is not easy due to difficulties with … more
Date: July 1, 1991
Creator: Heifets, S.
Partner: UNT Libraries Government Documents Department
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Technical Progress Report of the Indiana University High Energy Physics Group, December 1, 1979-November 30, 1980. [12/1/79-11/30/80]

Description: Research programs during the current contract year are associated with major experiments conducted at SLAC, Fermilab, and CERN. The physics areas under study include an exploration of polarization phenomena in hadron processes, a study of low-p/sub t/ and high-p/sub t/ collisions utilizing the Multiparticle Spectrometer at Fermilab, studies of psi meson production in hadron interactions, and a high-resolution study of e/sup +/e- interactions at high energy at SLAC. The status of the various eff… more
Date: January 1, 1980
Creator: Brabson, B. B.; Crittenden, R. R.; Dzierba, A. R.; Heinz, R. M.; Martin, H. J.; Neal, H. A. et al.
Partner: UNT Libraries Government Documents Department
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Production of. gamma. ,. pi. /sup 0/ and eta at large transverse momenta

Description: A measurement of direct photon production, as well as of ..pi../sup 0/ and eta meson production, has been performed at Fermilab. Data were taken for 200 GeV/c p and ..pi../sup +/ incident on Be, C and Al targets. The ratio of ..gamma../..pi../sup 0/ inclusive cross sections is presented for transverse momenta between 2 and 5 GeV/c.
Date: January 1, 1982
Creator: Biel, J.; Bromberg, C. & Brown, B.
Partner: UNT Libraries Government Documents Department
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Two-particle correlations in nuclear collisions. [800 MeV/A]

Description: Two-particle correlations in proton-nucleus and nucleus-nucleus collisions were measured with beams of 800 MeV/A at the Berkeley Bevalac to study the reaction mechanism in more detail. Results were obtained that give information about the mean free path of protons in the nucleus, the contribution of the single-knock-out process in the collisions between equal-size nuclei, and the nuclear shadowing effect in collisions with a heavy target nucleus. 3 figures. (RWR)
Date: July 1, 1980
Creator: Tanihata, I.
Partner: UNT Libraries Government Documents Department
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Inclusive. pi. /sup + -/, K/sup + -/, and p, anti p production in e/sup +/e/sup -/ annihilation at. sqrt. s = 29 GeV

Description: Measurements of ..pi../sup + -/, K/sup + -/ and p, anti p inclusive cross sections and fractions in e/sup +/e/sup -/ annihilation at ..sqrt..s = 29 GeV are presented. The momentum interval covered corresponds to 0.01 < z < 0.90, where z = pp/sub beam/. The analysis is based on approximately 70 pb/sup -1/ of data collected between 1984 and 1986 with the TPC2..gamma.. detector at PEP. Charged particles are identified by a simultaneous measurement of momentum and ionization energy loss (dEdx). The… more
Date: January 1, 1988
Creator: Cowan, G.D.
Partner: UNT Libraries Government Documents Department
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High energy behavior of fermion--meson and meson--meson scattering in a supersymmetric field theory

Description: A review of the general methods of high energy calculations within the framework of field theory is given. These include Feynman parameter methods, the infinite momentum frame, and Mellin transform methods. A general discussion of supersymmetry is also presented. The basic aspects of the Wess-Zumino model are given. This includes a proof of renormalizability through one-loop, and a derivation of the Feynman rules. The general supersymmetry algebra is presented. The method of generating represen… more
Date: December 1, 1977
Creator: Opoien, J.W.
Partner: UNT Libraries Government Documents Department
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Multifragmentation in intermediate energy heavy ion collisions

Description: The GSL/LBL plastic ball/wall detector system was used to gain insight into the fragment production mechanism in Au + Au and Au + Fe reactions. Full azimuthal coverage for light particles (p,d,t,/sup 3/He,/sup 4/He) and intermediate mass fragments (z greater than 10) is achieved in the forward hemisphere in the center of mass system. The complete measurement of light particles allowed a global analysis of the events and a search for collective effects in fragment emission by comparing to flow e… more
Date: April 14, 1986
Creator: Jacak, B. V.; Britt, H. C.; Claesson, G.; Doss, K. G. R.; Ferguson, R.; Gavron, A. I. et al.
Partner: UNT Libraries Government Documents Department
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Quasi-free scattering of kaons. [Plane wave impulse approximation, reaction mechanism]

Description: The inclusive scattering of K/sup +/ mesons on /sup 12/C is calculated in the plane wave impulse approximation. The momentum distribution employed for /sup 12/C and different reaction mechanism approaches is checked by a comparison with data of a calculation of the inclusive scattering of electrons on /sup 12/C.
Date: August 1, 1977
Creator: Alexander, Y. & Moffa, P. J.
Partner: UNT Libraries Government Documents Department
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pi. pi. scattering by pole extrapolation methods. [2. 67 GeV/c, angular distribution, Chew-Low and Durr-Pilkum methods, OPE model, isospin]

Description: A 25-inch hydrogen bubble chamber was used at the Lawrence Berkeley Laboratory Bevatron to produce 300,000 pictures of ..pi../sup +/p interactions at an incident momentum of the ..pi../sup +/ of 2.67 GeV/c. The 2-prong events were processed using the FSD and the FOG-CLOUDY-FAIR data reduction system. Events of the nature ..pi../sup +/p ..-->.. ..pi../sup +/p..pi../sup 0/ and ..pi../sup +/p ..-->.. ..pi../sup +/..pi../sup +/n with values of momentum transfer to the proton of -t less than or equa… more
Date: December 9, 1977
Creator: Lott, F.W. III
Partner: UNT Libraries Government Documents Department
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Multiplicity distributions in hadron-hadron collisions based on the universality ansatz

Description: Recent experiments on small-p/sub T/ hadron production in pp collisions have shed new light on the apparent violation of the universality ansatz that the multiplicity dispersion in hadron-hadron collisions is much larger than that in e/sup +/e/sup -/ collisions. We present a model based on the universality ansatz, among other things. This model reproduces qualitatively the hadron multiplicity distributions in pp collisions over a wide range of energies. Within our framework, this essentially re… more
Date: February 1, 1982
Creator: Chiu, C. B. & Xie, Q.
Partner: UNT Libraries Government Documents Department
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Importance of high order momentum terms in SLC optics

Description: The evaluation of background levels at the SLC relies, in several cases, on the proper representation of how low momentum electrons propagate through the Arcs and the Final Focus System (FFS). For example, beam - gas bremsstrahlung in the arcs causes electrons of up to 6% energy loss to be transported through to the IP; secondary showers on edges of masks and collimators yield debris with a very wide momentum spectrum. This note is a naive attempt at checking the validity of TRANSPORT and TURTL… more
Date: July 10, 1985
Creator: Kozanecki, W.
Partner: UNT Libraries Government Documents Department
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Jets in e/sup +/e/sup -/ annihilation

Description: The properties of jets produced in e/sup +/e/sup -/ annihilation have been investigated using data taken with the Mark 1 detector at SPEAR. The momentum distributions parallel and perpendicular to the jet axis were measured for all charged tracks, for K/sup 0/'s, and for rho/sup 0/'s. The K/sup 0/ and rho/sup 0/ Pt/sup 2/ distributions are well fit by the form dn/dPt/sup 2/ = A exp(-B/sup +/ Pt/sup 2/) with B = 4.6 +/- 0.2 for K/sup 0/'s and 5 +/- 1 for rho/sup 0/'s. The charged particle Pt/sup… more
Date: August 1, 1980
Creator: Cooper, S.C.
Partner: UNT Libraries Government Documents Department
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Fragmentation properties of jets produced in proton-antiproton collisions at radical S = 1. 8 TeV

Description: Jet fragmentation properties have been studied in collisions of protons and antiprotons at a center-of-mass energy of 1.8 TeV, using the Collider Detector at Fermilab (CDF). The fractional momentum distribution of charged particles within jets is presented and compared with Monte-Carlo predictions. With increasing di-jet invariant mass from 60 to 200 GeV/c{sup 2} the fragmentation is observed to soften as predicted by scale breaking effects in Quantum Chromodynamics (QCD). The charged multiplic… more
Date: November 1, 1989
Creator: Hubbard, B. (California Univ., Berkeley, CA (USA). Dept. of Physics):(Lawrence Berkeley Lab., CA (USA))
Partner: UNT Libraries Government Documents Department
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Progress report for 1979-1980. [Duke Univ. , 1979-1980]

Description: This basically administrative report describes research in the following areas: ..pi..-neon interactions at 200 GeV; direct ..gamma.. and e/sup +/e/sup -/ pair production; studies of photon production in 16-GeV/c ..pi../sup +/-p interactions; ..gamma..-p interactions at 20 GeV; and computer and hardware development. References are given to published work. An expenditure statement is included. (RWR)
Date: September 16, 1980
Creator: Walker, W. D.
Partner: UNT Libraries Government Documents Department
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Subthreshold pion production in the reaction /sup 139/La + /sup 139/La. -->. pi. /sup + -/ + X

Description: We have measured charged pion production in the reaction /sup 139/La + /sup 139/La ..-->.. ..pi../sup + -/ + X at three beam energies (246, 183 and 138 MeVnucleon) below the nucleon-nucleon threshold. Associated multiplicity for charged participants was obtained using a 110-element scintillator multiplicity array. Data were taken over the angular range of 21/degree/ to 67/degree/ in the laboratory (equivalent to 30/degree/ to 90/degree/ in the center of mass). Dependence of the spectra upon pio… more
Date: January 1, 1988
Creator: Miller, J.
Partner: UNT Libraries Government Documents Department
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Search for right-handed currents by means of muon spin rotation

Description: A muon spin rotation (..mu..SR) technique has been used to place limits on right-handed weak currents in ..mu../sup +/ decay. A beam of almost 100% polarized 'surface' muons obtained from the TRIUMF M13 beamline was stopped in essentially non-depolarizing >99.99% pure metal foils. The ..mu../sup +/ spins were precessed by 70-G or 110-G transverse fields. Decay e/sup +/ emitted within 225 mrad of the beam direction and with momenta above 46 MeV/c were momentum-analyzed to 0.2%. Comparison of the… more
Date: September 1, 1985
Creator: Stoker, D. P.
Partner: UNT Libraries Government Documents Department
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Method of measuring the polarization of high momentum proton beams. [Primakoff effect, asymmetries]

Description: A method of measuring the polarization of high momentum proton beams is proposed. This method utilizes the Primakoff effect and relates asymmetries at high energy to large asymmetries already measured at low energy. Such a new method is essential for the success of future experiments at energies where present methods are no longer feasible.
Date: January 1, 1976
Creator: Underwood, D.G.
Partner: UNT Libraries Government Documents Department
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Non-linear variation of the beta function with momentum

Description: A theory is presented for computing the non-linear dependence of the ..beta..-functions on momentum. Results are found for the quadratic term. The results of the theory are compared with computed results. A procedure is proposed for computing the strengths of the sextupole correctors to correct the dependence of the ..beta..-function on momentum.
Date: July 1, 1983
Creator: Parzen, G.
Partner: UNT Libraries Government Documents Department
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A search for supersymmetric electrons with the Mark II detector at PEP (Positron Electron Project)

Description: An experimental search for selectrons, the supersymmetric partner of the electron, has been performed at the PEP storage ring at SLAC using the Mark II detector. The experimental search done was based upon hypothetical reaction in e/sup +/e/sup -/ interactions at PEP center of mass energies of 29 GeV. In this reaction the selectrons, e-tilde, are assumed produced by the interaction of one of initial state electrons with a photon radiated from the other initial state electron. This latter electr… more
Date: October 1, 1987
Creator: LeClaire, B.W.
Partner: UNT Libraries Government Documents Department
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Measurement of the average lifetime of hadrons containing bottom quarks

Description: This thesis reports a measurement of the average lifetime of hadrons containing bottom quarks. It is based on data taken with the DELCO detector at the PEP e/sup +/e/sup -/ storage ring at a center of mass energy of 29 GeV. The decays of hadrons containing bottom quarks are tagged in hadronic events by the presence of electrons with a large component of momentum transverse to the event axis. Such electrons are identified in the DELCO detector by an atmospheric pressure Cherenkov counter assiste… more
Date: June 1, 1986
Creator: Klem, D.E.
Partner: UNT Libraries Government Documents Department
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Design of the D0 overpass dispersion correction

Description: The existing D0 overpass induces a vertical dispersion wave around the Main ring with dispersion amplitudes of around 1.6 to 1.8 m. There are two major reasons to eliminate or reduce vertical dispersion induced by the D0 overpass: to lower the beam momentum dependence on vertical positions which had not existed before the overpass; and to raise the Tevatron luminosity by eliminating the dispersion mismatch between the main Ring and Tevatron. 20 figs., 1 tab.
Date: October 7, 1987
Creator: Trbojevic, D.
Partner: UNT Libraries Government Documents Department
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