oalib
Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
Radiative Corrections to Moller Scattering of Polarized Particles  [PDF]
N. M. Shumeiko,J. G. Suarez
Physics , 1997,
Abstract: Principal contributions to QED radiative effects for Moller scattering of polarized particles are investigated both on the Born level and taking into account radiative corrections (RC). Scattering on the case of longitudinal and transversal polarized targets is also considered. In a general way the expressions for differential cross section and polarization asymmetry (PA) have been defined, and respective graphics for longitudinal and transversal polarization asymmetries and also for radiative corrections to asymmetry are presented. All quantities are presented in terms of covariant variables. The ultrarelativistic approximation was applied for calculations. The results of a computer run are presented.
Asymmetries from Semi-inclusive Polarized Deep Inelastic Scattering  [PDF]
Eva-Maria Kabuss
Physics , 1997, DOI: 10.1063/1.53728
Abstract: The analysis of semi-inclusive data from deep inelastic scattering of polarized muons off polarized protons and deuterons by the SMC is presented. The resulting charged hadron asymmetries are used to determine polarized valence and sea quark distributions and their contributions to the nucleon spin. In addition, a new approach to derive inclusive asymmetries is discussed.
Left-right asymmetries in polarized $e-μ$ scattering  [PDF]
J. C. Montero,V. Pleitez,M. C. Rodriguez
Physics , 1998, DOI: 10.1103/PhysRevD.58.097505
Abstract: We consider, in the electroweak standard model context, several left-right asymmetries in $\mu e$ elastic scattering at fixed target and collider experiments. For the former case, we show that the muon mass effects are important in a wide energy range. We also show that these asymmetries are sensitive to the electroweak mixing angle $\theta_W$. The effect of an extra $Z'$ neutral vector boson appearing in a 331 model is also considered. The capabilities of these asymmetries in the search of this extra $Z'$ are addressed.
Left-right asymmetries in polarized lepton-lepton scattering  [PDF]
J. C. Montero,V. Pleitez,M. C. Rodriguez
Physics , 1998, DOI: 10.1103/PhysRevD.58.094026
Abstract: Several parity violating left-right asymmetries in M\o ller electron-electron and muon-muon scattering are considered in the context of the electroweak standard model at tree level in fixed target and collider experiences. We show that in colliders the asymmetry with only one of the beam polarized is large enough to compensate the smaller cross section at high energies. We also show that these asymmetries are very sensitive to a doubly charged vector bilepton resonance but they are insensitive to scalar ones.
Nuclear suppression of azimuthal asymmetries in semi-inclusive deep inelastic scattering off polarized targets  [PDF]
Yu-kun Song,Zuo-tang Liang,Xin-Nian Wang
Physics , 2014, DOI: 10.1103/PhysRevD.89.117501
Abstract: We extend the study of nuclear dependence of the transverse momentum dependent parton distribution functions and azimuthal asymmetries to semi-inclusive deep inelastic scattering (SIDIS) off polarized nuclear targets. We show that azimuthal asymmetries are suppressed for SIDIS off a polarized nuclear target relative to that off a polarized nucleon due to multiple scattering inside the nucleus. Using the value of transport parameter inside large nuclei extracted from jet quenching analyses in SIDIS off nuclear targets, we also present a numerical estimate of the nuclear suppression of the azimuthal asymmetry that might be useful to guide the future experimental studies of SIDIS off polarized nuclear targets.
Measurement of double-spin asymmetries associated with deeply virtual Compton scattering on a transversely polarized hydrogen target  [PDF]
The HERMES Collaboration,A. Airapetian,N. Akopov,Z. Akopov,E. C. Aschenauer,W. Augustyniak,R. Avakian,A. Avetissian,E. Avetisyan,S. Belostotski,N. Bianchi,H. P. Blok,A. Borissov,J. Bowles,I. Brodski,V. Bryzgalov,J. Burns,M. Capiluppi,G. P. Capitani,E. Cisbani,G. Ciullo,M. Contalbrigo,P. F. Dalpiaz,W. Deconinck,R. De Leo,L. De Nardo,E. De Sanctis,P. Di Nezza,M. Dueren,M. Ehrenfried,G. Elbakian,F. Ellinghaus,R. Fabbri,A. Fantoni,L. Felawka,S. Frullani,D. Gabbert,G. Gapienko,V. Gapienko,F. Garibaldi,G. Gavrilov,V. Gharibyan,F. Giordano,S. Gliske,M. Golembiovskaya,M. Hartig,D. Hasch,M. Hoek,Y. Holler,I. Hristova,Y. Imazu,A. Ivanilov,H. E. Jackson,H. S. Jo,S. Joosten,R. Kaiser,G. Karyan,T. Keri,E. Kinney,A. Kisselev,V. Korotkov,V. Kozlov,P. Kravchenko,V. G. Krivokhijine,L. Lagamba,L. Lapikas,I. Lehmann,P. Lenisa,A. Lopez Ruiz,W. Lorenzon,X. -G. Lu,X. -R. Lu,B. -Q. Ma,D. Mahon,N. C. R. Makins,S. I. Manaenkov,L. Manfre,Y. Mao,B. Marianski A. Martinez de la Ossa,H. Marukyan,C. A. Miller,Y. Miyachi,A. Movsisyan,M. Murray,A. Mussgiller,E. Nappi,Y. Naryshkin,A. Nass,M. Negodaev,W. -D. Nowak,L. L. Pappalardo,R. Perez-Benito,M. Raithel,P. E. Reimer,A. R. Reolon,C. Riedl,K. Rith,G. Rosner,A. Rostomyan,J. Rubin,D. Ryckbosch,Y. Salomatin,A. Schaefer,G. Schnell,K. P. Schueler,B. Seitz,T. -A. Shibata,V. Shutov,M. Stancari,M. Statera,E. Steffens,J. J. M. Steijger,F. Stinzing,S. Taroian,A. Terkulov,R. Truty,A. Trzcinski,M. Tytgat,Y. Van Haarlem,C. Van Hulse,D. Veretennikov,V. Vikhrov,I. Vilardi
Physics , 2011, DOI: 10.1016/j.physletb.2011.08.067
Abstract: Double-spin asymmetries in exclusive electroproduction of real photons from a transversely polarized hydrogen target are measured with respect to the product of target polarization with beam helicity and beam charge, and with respect to the product of target polarization with beam helicity alone. The asymmetries arise from the deeply virtual Compton scattering process and its interference with the Bethe--Heitler process. They are related to the real part of the same combination of Compton form factors as that determining the previously published transverse target single-spin asymmetries through the imaginary part. The results for the double-spin asymmetries are found to be compatible with zero within the uncertainties of the measurement, and are not incompatible with the predictions of the only available GPD-based calculation.
Gluon Contributions to Parity-Violating Asymmetries in Polarized Proton-Proton Scattering  [PDF]
John Ellis,Stefano Moretti,Douglas Ross
Physics , 2001, DOI: 10.1088/1126-6708/2001/06/043
Abstract: We report on a calculation of one-loop weak corrections to polarized quark-gluon scattering and the corresponding crossed channels. Such contributions are suppressed formally by one power of alpha_s relative to W- or Z-mediated quark-quark scattering, but would enable the spin asymmetry of the gluon distribution to contribute to parity-violating asymmetries that will soon be investigated in polarized proton-proton scattering experiments at RHIC. In certain kinematic regions, gluon contributions to parity-violating asymmetries can be as large as 10% of the tree-level W- and Z-exchanges in quark-quark scattering, but usually only where the parity-violating asymmetries are already small.
Stable Algorithm for Extraction of Asymmetries from the Data on Polarized Lepton-Nucleon Scattering  [PDF]
N. Gagunashvili
Physics , 1998, DOI: 10.1016/S0168-9002(00)00335-1
Abstract: A new algorithm for extraction of asymmetries from polarized lepton-nucleon scattering data is proposed. The algorithm is stable to set-up acceptance and/or luminosity monitor acceptance variations. A statistical test for checking the data quality is proposed.
Measurement of azimuthal asymmetries associated with deeply virtual Compton scattering on a longitudinally polarized deuterium target  [PDF]
The HERMES Collaboration,A. Airapetian,N. Akopov,Z. Akopov,E. C. Aschenauer,W. Augustyniak,R. Avakian,A. Avetissian,E. Avetisyan,S. Belostotski,N. Bianchi,H. P. Blok,A. Borissov,J. Bowles,I. Brodski,V. Bryzgalov,J. Burns,M. Capiluppi,G. P. Capitani,E. Cisbani,G. Ciullo,M. Contalbrigo,P. F. Dalpiaz,W. Deconinck,R. De Leo,L. De Nardo,E. De Sanctis,M. Diefenthaler,P. Di Nezza,M. Dueren,M. Ehrenfried,G. Elbakian,F. Ellinghaus,A. Fantoni,L. Felawka,S. Frullani,D. Gabbert,G. Gapienko,V. Gapienko,F. Garibaldi,G. Gavrilov,V. Gharibyan,F. Giordano,S. Gliske,M. Golembiovskaya,C. Hadjidakis,M. Hartig,D. Hasch,G. Hill,A. Hillenbrand,M. Hoek,Y. Holler,I. Hristova,Y. Imazu,A. Ivanilov,H. E. Jackson,A. Jgoun,H. S. Jo,S. Joosten,R. Kaiser,G. Karyan,T. Keri,E. Kinney,A. Kisselev,N. Kobayashi,V. Korotkov,V. Kozlov,B. Krauss,P. Kravchenko,V. G. Krivokhijine,L. Lagamba,R. Lamb,L. Lapikas,I. Lehmann,P. Lenisa,L. A. Linden-Levy,A. Lopez Ruiz,W. Lorenzon,X. -G. Lu,X. -R. Lu,B. -Q. Ma,D. Mahon,N. C. R. Makins,S. I. Manaenkov,L. Manfre,Y. Mao,B. Marianski,A. Martinez de la Ossa,H. Marukyan,C. A. Miller,A. Movsisyan,V. Muccifora,M. Murray,D. Mueller,A. Mussgiller,E. Nappi,Y. Naryshkin,A. Nass,M. Negodaev,W. -D. Nowak,L. L. Pappalardo,R. Perez-Benito,N. Pickert,M. Raithel,P. E. Reimer,A. R. Reolon,C. Riedl,K. Rith,G. Rosner,A. Rostomyan,J. Rubin,D. Ryckbosch,Y. Salomatin,F. Sanftl,A. Schaefer,G. Schnell,K. P. Schueler,B. Seitz,T. -A. Shibata,V. Shutov,M. Stancari,M. Statera,E. Steffens
Physics , 2010, DOI: 10.1016/j.nuclphysb.2010.09.010
Abstract: Azimuthal asymmetries in exclusive electroproduction of a real photon from a longitudinally polarized deuterium target are measured with respect to target polarization alone and with respect to target polarization combined with beam helicity and/or beam charge. The asymmetries appear in the distribution of the real photons in the azimuthal angle $\phi$ around the virtual photon direction, relative to the lepton scattering plane. The asymmetries arise from the deeply virtual Compton scattering process and its interference with the Bethe-Heitler process. The results for the beam-charge and beam-helicity asymmetries from a tensor polarized deuterium target with vanishing vector polarization are shown to be compatible with those from an unpolarized deuterium target, which is expected for incoherent scattering dominant at larger momentum transfer. Furthermore, the results for the single target-spin asymmetry and for the double-spin asymmetry are found to be compatible with the corresponding asymmetries previously measured on a hydrogen target. For coherent scattering on the deuteron at small momentum transfer to the target, these findings imply that the tensor contribution to the cross section is small. Furthermore, the tensor asymmetry is found to be compatible with zero.
Electroweak Radiative Corrections To Polarized M?ller Scattering Asymmetries  [PDF]
Andrzej Czarnecki,William J. Marciano
Physics , 1995, DOI: 10.1103/PhysRevD.53.1066
Abstract: One loop electroweak radiative corrections to left-right parity violating M{\o}ller scattering ($e^-e^-\to e^-e^-$) asymmetries are presented. They reduce the standard model (tree level) prediction by 40$\pm 3$ \% where the main shift and uncertainty stem from hadronic vacuum polarization loops. A similar reduction also occurs for the electron-electron atomic parity violating interaction. That effect can be attributed to an increase of $\sin^2\theta_W(q^2)$ by $3\%$ in running from $q^2=m_Z^2$ to 0. The sensitivity of the asymmetry to ``new physics'' is also discussed.
Page 1 /100
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.