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Q sup 2 and A dependence of. Delta. (1232) electroexcitation in nuclei

Description: Inclusive electron scattering measurements from SLAC of {Delta} electroexcitation in nuclei are presented. Electrons with energies of 0.96, 1.1, 1.3 and 1.5 GeV were scattered from H, {sup 4}He, C, Fe and W at 37.5{degree} and detected with the End Station A 1.6 GeV/c spectrometer. Q{sup 2} at the {Delta} peak ranged from 0.2 to 0.5 (GeV/c{sup 2}). For all nuclear targets the {Delta} peak position shifts for higher invariant mass as Q{sup 2} increases and in all but one case is above that of th… more
Date: January 1, 1989
Creator: Sealock, R.M.
Partner: UNT Libraries Government Documents Department
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Xi-Scaling

Description: A class of purely kinematical corrections to xi-scaling is exposed. These corrections are inevitably present in any realistic hadron model with spin and gauge invariance and lead to phenomenologically important M/sub hadron//sup 2//Q/sup 2/ corrections to Nachtmann moments.
Date: April 1, 1980
Creator: Gunion, J. F.
Partner: UNT Libraries Government Documents Department
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A theoretical perspective on neutrino physics

Description: A survey of sin{sup 2} {theta}{sub W}, {rho}, CKM matrix, and axial-isoscalar neutral current measurements via neutrino scattering is presented. Loop effects due to heavy top or a fourth generation are described. Neutrino oscillations are discussed in a three generation mixing framework and some motivation for {nu}{sub {mu}} {yields} {nu}{sub {tau}} oscillation searches is given. 15 refs., 1 tab.
Date: September 1, 1989
Creator: Marciano, W.J. (Brookhaven National Lab., Upton, NY (USA))
Partner: UNT Libraries Government Documents Department
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Factorization at small x

Description: We show how to modify the Lipatov equation to treat short distance cross sections in the factorization theorem.
Date: January 1, 1990
Creator: Collins, J.C. (Pennsylvania Univ., Philadelphia, PA (USA). Dept. of Physics Argonne National Lab., IL (USA)) & Ellis, R.K. (Fermi National Accelerator Lab., Batavia, IL (USA))
Partner: UNT Libraries Government Documents Department
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Transition from quasi-elastic to deep-inelastic reactions

Description: Heavy ion induced transfer reactions are usually considered to fall into two categories. Quasi-elastic processes, on one hand, are characterized by small energy transfers, with one-nucleon transfer reactions being a typical example. These processes are dominant for grazing collisions, and are generally described within simple one-step DWBA calculations. Deep inelastic reactions, on the other hand, occur for more central collisions where the interaction time is longer and subsequently more energ… more
Date: January 1, 1986
Creator: Rehm, K.E.
Partner: UNT Libraries Government Documents Department
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Testing string dynamics in lepton nucleus reactions

Description: The sensitivity of nuclear attenuation of 10-100 GeV lepton nucleus ({ell}A) reactions to space-time aspects of hadronization is investigated within the context of the Lund string model. We consider two mechanisms for attenuation in a nucleus: final state cascading and string flip excitations. Implications for the evolution of the energy density in nuclear collisions are discussed. 16 refs., 10 figs.
Date: October 1, 1989
Creator: Gyulassy, M. & Pluemer, M.
Partner: UNT Libraries Government Documents Department
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Hadronic final states in 490 GeV muon deep inelastic scattering

Description: Hadronic final states from 490 GeV muon interactions on H{sub 2}, D{sub 2} and Xe targets have been studied. Jet physics and inclusive K{sup 0} production results are presented. 2-forward jet events in deep inelastic scattering can originate from gluon bremsstrahlung and from photon-gluon fusion. Evidence for jet structure consistent with QCD predictions is seen. Inclusive K{sup 0} production is studied and some preliminary results are given. 6 refs., 6 figs.
Date: November 1, 1990
Creator: Wolbers, S.
Partner: UNT Libraries Government Documents Department
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Ep option at the SSC

Description: The possibilities for colliding electrons with the 20 TeV proton beams of the SSC are considered. Kinematics of ep colliding beams is reviewed. Energies that may be possible and interesting are suggested, and detector problems associated with the highly imbalanced collisions are briefly considered.
Date: May 1, 1984
Creator: Prescott, Charles Y.
Partner: UNT Libraries Government Documents Department
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Electron and muon physics sessions: Summary

Description: The electromagnetic interaction needs no introduction as a probe of the structure of systems on many scales. The continued use of this technique dominated the sessions on Electron and Muon Physics at the Samoset Meeting. The experimental results continue to stimulate large numbers of theorists and the results on polarized deep inelastic muon scattering and their various interpretations permeated beyond these sessions. The breadth of physics attacked with electrons and muons makes a summary such… more
Date: June 1, 1988
Creator: Montgomery, H.E.
Partner: UNT Libraries Government Documents Department
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Applications of QCD. [Review]

Description: A review is given of reliable quantum chromodynamics predictions which either have or soon can be verified by experiment. Included are a discussion of the classic application of quantum chromodynamics perturbation theory and asymptotic freedom to predict scaling violations in deep inelastic leptoproduction experiments, with emphasis on the first direct experimental confirmation of the numerical values of the anomalous dimensions; a review of recent advances in developing and justifying quantum … more
Date: May 1, 1978
Creator: Ellis, J.
Partner: UNT Libraries Government Documents Department
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Developments in sub-barrier reactions

Description: The study of sub-barrier reactions has developed in recent years to include a broad range of interconnected phenomena. The initial discoveries of enhanced sub-barrier fusion cross sections and the attempts to understand them in terms of couplings to other reactions channels have stimulated investigations into all aspects of heavy-ion collisions at low bombarding energies. As a result, new effects have been observed and new ideas are being put forward. The present talk gives an overview of some … more
Date: January 1, 1988
Creator: Landowne, S.
Partner: UNT Libraries Government Documents Department
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Measurement of the nu/sub. mu. / charged-current cross section

Description: The Fermilab 15-ft bubble chamber, filled with a heavy neon-hydrogen mix, was exposed to a narrow band nu/sub ..mu../ beam. Based on the observation of 830 charged current nu/sub ..mu../ interactions, the cross section was found to rise linearly with the neutrino energy in the interval, 10 GeV less than or equal to E/sub nu/ less than or equal to 240 GeV, with a constant slope of: sigma/sub nu/E/sub nu/ = (0.64 +- 0.05) 10/sup -38/ cm/sup 2/ GeV/sup -1/. This result is discussed in relation to … more
Date: January 1, 1982
Creator: Baker, N. J.; Connolly, P. L & Kahn, S. A.
Partner: UNT Libraries Government Documents Department
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Quarks and gluons in low-p/sub T/ physics

Description: Review and comment are given on some of the existing approaches to low-p/sub T/ particle production based on ideas of quantum chromodynamics. The relationships between the various theories are emphasized and, the points of overlap between them are noted. Constraints upon the models coming from deep inelastic and e/sup +/e/sup -/ annihilation data are discussed.
Date: September 1, 1980
Creator: Gunion, J.F.
Partner: UNT Libraries Government Documents Department
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Final state effects in quantum fluids

Description: The extraction of momentum distributions from high energy scattering experiment depends on the validity of the impulse approximation (IA) which has been extensively discussed in the workshop overview. The IA assumes that in the scattering process the kinetic energy imparted to a recoiling particle is large compared to the potential energy due to neighboring particles. While this may be true for x-ray Compton scattering from electronic systems, it is less true for quasielastic electron-nucleus s… more
Date: January 1, 1989
Creator: Silver, R.N.
Partner: UNT Libraries Government Documents Department
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Radiative corrections and Z prime searches at ep colliders

Description: We examined the sensitivity of the Z{prime} searches at ep colliders to the unknown values of the top quark and Higgs boson masses (m{sub t} and m{sub H}) in a number of extended electroweak models through the use of polarization asymmetries including the effects of weak radiative corrections.
Date: January 1, 1990
Creator: Rizzo, Thomas G.
Partner: UNT Libraries Government Documents Department
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Inelastic Muon-Proton Scattering: Multiplicity Distributions, and Prong Cross Sections

Description: In a streamer chamber experiment at SLAC, hadron production was observed in inelastic collisions of 14 GeV positive muons in a liquid hydrogen target. Experiment, analysis, and resulting cross-sections are reported for hadronic prongs as well as charged hadron multiplicity distribution.
Date: January 1, 1976
Creator: del Papa, C.; Dorfan, D. & Flatte, S. M.
Partner: UNT Libraries Government Documents Department
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Deep inelastic phenomena

Description: Nucleon structure as seen in the context of deep inelastic scattering is discussed. The lectures begin with consideration of the quark-parton model. The model forms the basis of understanding lepton-nucleon inelastic scattering. As improved data in lepton-nucleon scattering at high energies became available, the quark-parton model failed to explain some crucial features of these data. At approximately the same time a candidate theory of strong interactions based on a SU(3) gauge theory of color… more
Date: October 1, 1980
Creator: Prescott, Charles Y.
Partner: UNT Libraries Government Documents Department
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Has hadronic color been excited in neutrino experiments. [Cross sections]

Description: The effect of the massive ''color'' gluon excitation in charged current ..nu..N and anti..nu..N inclusive scattering is studied. The observed rise in sigma/sub c//sup anti..nu..//sigma/sub c//sup ..nu../ and (y)/sup anti..nu../ can be understood as a transient effect arising from the opening of hadronic ''color'' thresholds. This interpretation of the charged current neutrino phenomena does not call for the introduction of the right-handed current of the type (anti pn')/sub R/.
Date: June 1, 1976
Creator: Sidhu, D. P.; Mohapatra, R. N. & Pati, J. C.
Partner: UNT Libraries Government Documents Department
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Experiments on nucleon spin-dependent structure functions

Description: In this presentation, the earlier measurements of the spin-dependent structure function of the proton in experiments at SLAC and at CERN are reviewed. In addition several new deep inelastic scattering experiments to measure the spin-dependent structure functions of the nucleon, both proton and neutron, will be discussed.
Date: January 1, 1991
Creator: Igo, G. (California Univ., Los Angeles, CA (United States). Dept. of Physics) & Hughes, V. W. (Yale Univ., New Haven, CT (United States). Dept. of Physics)
Partner: UNT Libraries Government Documents Department
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Nuclear orbiting

Description: Nuclear orbiting following collisions between sd and p shell nuclei is discussed. The dependence of this process on the real and imaginary parts of the nucleus-nucleus potential is discussed, as well as the evolution of the dinucleus toward a fully equilibrated fused system. 26 refs., 15 figs.
Date: January 1, 1988
Creator: Shapira, D.
Partner: UNT Libraries Government Documents Department
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Deep-inelastic lepton scattering by nuclei. The pion-exchange model

Description: Quark constituents of nucleons were discovered in deep-inelastic electron scattering. It is not surprising therefore that the nuclear effects in deep-inelastic lepton scattering first observed by the European Muon Collaboration (EMC) have spawned many suggestions of revolutionary changes in our views of nuclear structure. Perhaps quarks play a far more active role in nuclear dynamics than the conventional theory provides. Before following the natural appeal of radical conclusions we believe it … more
Date: January 1, 1985
Creator: Coester, F. & Berger, E. L.
Partner: UNT Libraries Government Documents Department
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Impact of higher twist terms on the analysis of scaling violation

Description: A critical discussion is given of analyses of scaling violation in deep-inelastic scattering in the context of QCD. Several possible approaches are examined. Higher twist contributions are defined, and it is shown that they can have a crucial impact on tests of QCD. Higher twist terms can dramatically affect R = sigma/sub L//sigma/sub T/. QCD may be harder to test than previously realized. 17 references.
Date: September 1, 1979
Creator: Barnett, R. Michael
Partner: UNT Libraries Government Documents Department
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Inclusive neutrino interactions in a six quark model

Description: The effects of non-diagonal terms in the neutral current of an SU(2) x U(1) gauge six-quark model with slow rescaling are examined. The model reproduces the experimental charged current data with appropriate choice of heavy quark masses. The experimental neutral current data requires at least five quarks to explain it. In our context, the predictions for various heavy quark masses and quark mixings differ most for energies in the range 0 to 50 GeV. The various quantities are also calculated for… more
Date: January 1, 1976
Creator: Aubrecht, G. J., II; Takasugi, E. & Tanaka, K.
Partner: UNT Libraries Government Documents Department
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