8 results on '"Lambda: electroproduction"'
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2. Investigation of the scintillating fiber SCSF-38M for the 6m-tagger and measurement of inclusive $\mathrm{K^0_S}$ meson and $\Lambda$ baryon production in neutral current deep inelastic scattering at HERA
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Ziegler, Arzu
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Lambda: electroproduction ,positron p: deep inelastic scattering ,tungsten ,K0(S): electroproduction ,electroproduction [Lambda] ,thesis ,electroproduction [K0(S)] ,bibliography ,ZEUS ,sandwich [calorimeter] ,fibre [scintillation counter] ,DESY HERA Stor ,differential cross section ,scintillation counter: fibre ,deep inelastic scattering [positron p] ,calorimeter: sandwich ,experimental results - Abstract
Universität Hamburg, Diss., 2003; 157 pp., (2003). doi:10.3204/DESY-THESIS-2003-012, Published by Deutsches Elektronen-Synchrotron, DESY, Hamburg
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- 2003
3. Measurement of longitudinal spin transfer to $\Lambda$ hyperons in deep inelastic lepton scattering
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Airapetian, A., Akopov, N., Amarian, M., Aschenauer, E. C., Avakian, H., Avakian, R., Avetissian, A., Bains, B., Baumgarten, C., Beckmann, M., Belostotski, S., Belz, J. E., Benisch, Th., Bernreuther, S., Bianchi, N., Blouw, J., Bottcher, H., Borissov, A., Bouwhuis, M., Brack, J., Brauksiepe, S., Braun, B., Bray, B., Brons, S., Bruckner, W., Brull, A., Bruins, E. E. W., Bulten, H. J., Capitani, G. P., Carter, P., Chumney, P., Cisbani, E., Court, G. R., Dalpiaz, P. F., De Sanctis, E., De Schepper, D., Devitsin, E., De Witt Huberts, P. K. A., Di Nezza, P., Duren, M., Dvoredsky, A., Elbakian, G., Ely, J., Fantoni, A., Fechtchenko, A., Ferstl, M., Fiedler, K., Filippone, B. W., Fischer, H., Fox, B., Franz, J., Frullani, S., Funk, M.-A., Garber, Y., Gao, H., Garibaldi, F., Gavrilov, G., Geiger, P., Gharibyan, V., Golendukhin, A., Graw, G., Grebeniouk, O., Green, P. W., Greeniaus, L. G., Grosshauser, C., Guidal, M., Gute, A., Gyurjyan, V., Haas, J. P., Haeberli, W., Hausser, O., Hansen, J.-O., Hartig, M., Hasch, D., Heinsius, F. H., Henderson, R., Henoch, M., Hertenberger, R., Holler, Y., Holt, R. J., Hoprich, W., Ihssen, H., Iodice, M., Izotov, A., Jackson, H. E., Jgoun, A., Kaiser, R., Kinney, E., Kirsch, M., Kisselev, A., Kitching, P., Kobayashi, H., Koch, N., Konigsmann, K., Kolstein, M., Kolster, H., Korotkov, V., Korsch, W., Kozlov, V., Kramer, L. H., Krivokhijine, V. G., Kurisuno, M., Kyle, G., Lachnit, W., Lenisa, P., Lorenzon, W., Makins, N. C. R., Manaenkov, S. I., Martens, F. K., Martin, J. W., Masoli, F., Mateos, A., McAndrew, M., McIlhany, K., McKeown, R. D., Meissner, F., Menden, F., Metz, A., Meyners, N., Mikloukho, O., Miller, C. A., Miller, M. A., Milner, R., Most, A., Muccifora, V., Mussa, R., Nagaitsev, A., Naryshkin, Y., Nathan, A. M., Neunreither, F., Niczyporuk, J. M., Nowak, W.-D., Nupieri, M., O'Neill, T. G., Openshaw, R., Ouyang, J., Owen, B. R., Papavassiliou, V., Pate, S. F., Pitt, M., Potashov, S., Potterveld, D. H., Rakness, G., Reali, A., Redwine, R., Reolon, A. R., Ristinen, R., Rith, K., Rossi, P., Rudnitsky, S., Ruh, M., Ryckbosch, D., Sakemi, Y., Savin, I., Scarlett, C., Schmidt, F., Schmitt, H., Schnell, G., Schuler, K. P., Schwind, A., Seibert, J., Shibata, T.-A., Shibatani, K., Shin, T., Shutov, V., Simani, C., Simon, A., Sinram, K., Slavich, P., Spengos, M., Steffens, E., Stenger, J., Stewart, J., Stosslein, U., Sutter, M., Tallini, H., Taroian, S., Terkulov, A., Thomas, E., Tipton, B., Tytgat, M., Urciuoli, G. M., Van Den Brand, J. F. J., Van Der Steenhoven, G., Van De Vyver, R., Van Hunen, J. J., Vetterli, M. C., Vikhrov, V., Vincter, M. G., Visser, J., Volk, E., Wander, W., Wendland, J., Williamson, S. E., Wise, T., Woller, K., Yoneyama, S., and Zohrabian, H.
- Subjects
positron: polarized beam ,Lambda: electroproduction ,quark model parton ,positron p: deep inelastic scattering ,up: fragmentation ,Lambda: polarization ,HERMES ,up: polarization ,+p+pi%22">Lambda --> p pi ,helicity: conservation law ,DESY HERA Stor ,27.5 GeV ,mass spectrum: (p pi-) ,angular distribution ,+Lambda%22">positron p --> Lambda ,experimental results - Abstract
Physical review / D 64(11), 112005 (2001). doi:10.1103/PhysRevD.64.112005, Spin transfer in deep-inelastic Lambda electroproduction has been studied with the HERMES detector using the 27.6 GeV polarized positron beam in the HERA storage ring. For an average fractional energy transfer = 0.45, the longitudinal spin transfer from the virtual photon to the Lambda has been extracted. The spin transfer along the Lambda momentum direction is found to be 0.11 +/- 0.17 (stat) +/- 0.03 (sys); similar values are found for other possible choices for the longitudinal spin direction of the Lambda. This result is the most precise value obtained to date from deep-inelastic scattering with charged lepton beams, and is sensitive to polarized up quark fragmentation to hyperon states. The experimental result is found to be in general agreement with various models of the Lambda spin content, and is consistent with the assumption of helicity conservation in the fragmentation process., Published by Inst., Woodbury, NY
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- 2001
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4. Measurement of Spin Transfer at $\Lambda^0$ Production in Polarized Lepton Nucleon Scattering in the HERMES Experiment
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Bernreuther, Stefan
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positron: polarized beam ,Lambda: electroproduction ,quark model parton ,positron p: deep inelastic scattering ,polarization: longitudinal ,thesis ,positron p: inclusive reaction ,momentum dependence ,Lambda: polarization ,HERMES ,Lambda: photoproduction ,Lambda: hadronic decay ,energy dependence ,DESY HERA Stor ,27.5 GeV ,effect: flavor ,hydrogen: polarized target ,experimental results - Abstract
Friedrich-Alexander-Universität Erlangen-Nürnberg , Diss., 2000; 109 pp., (2000). doi:10.3204/DESY-THESIS-2000-003, Spin transfer to $\Lambda^0$-Hyperons in semi-inclusive deep inelastic scattering of longitudinally polarized positrons from both unpolarized and longitudinally polarized nucleons has been investigated. The data were collected by the HERMESExperiment at DESY in Hamburg during 1996 and 1997 covering a kinematic range of 0.8 < $Q^2$ , 0.02 < x < 0.5 and 0.2 $\leq$ z. To avoid asymmetries caused by acceptance effects, datasets with all possible permutations for polarization directions of beam and target have been combined. The result for the spin transfer, dominated by scattering from u-quarks is compatible with zero and therefore in agreement with the Naive Quark-Parton Model expectation. However limited statistic precision does not allow to exclude other models significantly. Supplementary events with no scattered positron in coincidence with the $\Lambda^0$ - decay products seen in the HERMES-detector have been analysed. They show much better statistic precision, but due to their small averaged $Q^2$ of 0.21 their interpretation in the frame of the Naive Quark-Parton Model is at least questionable. The resulting spin transfer from the lepton beam to the outgoing $\Lambda^0$-Hyperon for this dataset is 0.122 ± 0.047 ± 0.05.
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- 2000
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5. Neutral strange particle production in neutral current deep inelastic scattering at HERA
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Ullmann, Rainer Thomas
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Thesis ,Lambda: electroproduction ,positron p: deep inelastic scattering ,K0(S): electroproduction ,bibliography ,energy flow ,ZEUS ,K/s0: production ,particle flow ,positron p: colliding beams ,energy dependence ,rapidity: gap ,DESY HERA Stor ,electron p: colliding beams ,rapidity spectrum ,dependence: momentum transfer ,transverse momentum: spectrum ,300 GeV-cms ,multiplicity: spectrum ,experimental results - Abstract
McGill Univerity, Diss., 1997; 184 pp. (1997). = McGill Univerity, Diss., 1997
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- 1997
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6. RECENT RESULTS FROM ARGUS ON PRODUCTION AND DECAY OF HEAVY PARTICLES
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MacFarlane, David B., Schroder, Henning, and ARGUS Collaboration
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NONLEPTONIC DECAY [UPSILON(9460)] ,ELECTROPRODUCTION: LAMBDA ,ELECTROPRODUCTION: OMEGA ,ARGUS ,ELECTROPRODUCTION: XI ,TALK ,B [DECAY MODES] ,+OMEGA%28783%29+PI+NEUTRINO%22">TAU --> OMEGA(783) PI NEUTRINO ,OMEGA-: ELECTROPRODUCTION ,ELECTROPRODUCTION [HYPERON] ,UPSILON MESONS ,OMEGA ,HYPERON [ELECTROPRODUCTION] ,SIGMA(1385): ELECTROPRODUCTION ,ELECTROPRODUCTION [LAMBDA] ,ELECTROPRODUCTION: HYPERON ,DESY DORIS II STOR ,UPSILON(9460) [NONLEPTONIC DECAY] ,HYPERON: ELECTROPRODUCTION ,ELECTROPRODUCTION [SIGMA(1385)] ,SEMILEPTONIC DECAY: TAU ,+PHI%281020%29+ANTI-K0%22">D0 --> PHI(1020) ANTI-K0 ,COLLIDING BEAMS [ELECTRON POSITRON] ,ELECTROPRODUCTION: SIGMA(1385) ,ELECTROPRODUCTION [XI-] ,ANNIHILATION: ELECTRON POSITRON ,SIGMA0 [ELECTROPRODUCTION] ,DECAY MODES: B ,ELECTRON POSITRON: COLLIDING BEAMS ,LAMBDA ,ELECTRON POSITRON [ANNIHILATION] ,TAU: SEMILEPTONIC DECAY ,ANNIHILATION [ELECTRON POSITRON] ,XI-: ELECTROPRODUCTION ,APPROX. 10 GEV-CMS ,ELECTROPRODUCTION [XI(1530)] ,XI(1530) [ELECTROPRODUCTION] ,XI- [ELECTROPRODUCTION] ,OMEGA- [ELECTROPRODUCTION] ,SIGMA0 ,TAU [SEMILEPTONIC DECAY] ,LAMBDA [ELECTROPRODUCTION] ,XI ,XI(1530) ,DECAY MODES [B] ,SIGMA(1385) ,COLLIDING BEAMS: ELECTRON POSITRON ,EXPERIMENTAL RESULTS ,ELECTROPRODUCTION: XI(1530) ,D0: NONLEPTONIC DECAY ,ELECTROPRODUCTION: SIGMA0 ,NONLEPTONIC DECAY: D0 ,SEMILEPTONIC DECAY [TAU] ,B: DECAY MODES ,XI(1530): ELECTROPRODUCTION ,NONLEPTONIC DECAY: UPSILON(9460) ,SIGMA0: ELECTROPRODUCTION ,ELECTRON POSITRON [COLLIDING BEAMS] ,SIGMA(1385) [ELECTROPRODUCTION] ,UPSILON(9460): NONLEPTONIC DECAY ,NONLEPTONIC DECAY [D0] ,LAMBDA: ELECTROPRODUCTION ,ELECTROPRODUCTION [OMEGA-] ,D0 [NONLEPTONIC DECAY] ,ELECTRON POSITRON: ANNIHILATION ,ELECTROPRODUCTION [SIGMA0] - Abstract
26 pp. (1986).
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- 1986
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7. Inclusive Lambdaproduktion in der $e^+ e^-$ Annihilationen bei 35 GeV
- Author
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Brehm, Wolfgang
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LAMBDA [MASS] ,ELECTROPRODUCTION: LAMBDA ,YIELD: (LAMBDA ANTILAMBDA) ,ENERGY DEPENDENCE: DIFFERENTIAL CROSS SECTION ,35 GEV-CMS ,DESY PETRA STOR ,DIFFERENTIAL CROSS SECTION: ENERGY DEPENDENCE ,MASS [LAMBDA] ,THESIS ,WIDTH [LAMBDA] ,LAMBDA [ELECTROPRODUCTION] ,DIFFERENTIAL CROSS SECTION [ENERGY DEPENDENCE] ,COLLIDING BEAMS: ELECTRON POSITRON ,EXPERIMENTAL RESULTS ,ELECTROPRODUCTION [LAMBDA] ,COLLIDING BEAMS [ELECTRON POSITRON] ,(LAMBDA ANTILAMBDA) [YIELD] ,ANNIHILATION: ELECTRON POSITRON ,LAMBDA: MASS ,ELECTRON POSITRON [COLLIDING BEAMS] ,MASS: LAMBDA ,ELECTRON POSITRON: COLLIDING BEAMS ,ELECTRON POSITRON [ANNIHILATION] ,ENERGY DEPENDENCE [DIFFERENTIAL CROSS SECTION] ,LAMBDA: WIDTH ,ANNIHILATION [ELECTRON POSITRON] ,LAMBDA: ELECTROPRODUCTION ,CELLO ,ELECTRON POSITRON: ANNIHILATION - Abstract
Universität Hamburg, Diplomarbeit, 1989; 62 pp. (1989). = Universität Hamburg, Diplomarbeit, 1989
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- 1989
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8. A Detailed Study of Strange Particle Production in $e^+ e^-$ Annihilation at High-energy
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Althoff, M., Braunschweig, W., Kirschfink, F. J., Lubelsmeyer, K., Martyn, H. U., Rosskamp, P., Schmitz, D., Siebke, H., Wallraff, W., Eisenmann, J., Fischer, H. M., Hartmann, H., Jocksch, A., Knop, G., Kolanoski, H., Kuck, H., Mertens, V., Wedemeyer, R., Foster, B., Eskreys, A., Gather, K., Hildebrandt, M., Hultschig, H., Joos, P., Kotz, U., Kowalski, H., Ladage, A., Lohr, B., Luke, D., Mattig, Peter, Notz, D., Nowak, R. J., Pyrlik, J., Ronat, E., Rushton, M., Schutte, W., Trines, D., Tymieniecka, T., Wolf, G., Yekutieli, G., Xiao, C., Fohrmann, R., Hilger, E., Kracht, T., Krasemann, H. L., Leu, P., Lohrmann, E., Pandoulas, D., Poelz, G., Posnecker, K. U., Wiik, B. H., Beuselinck, R., Binnie, D. M., Campbell, A. J., Dornan, P. J., Garbutt, D. A., Jenkins, Colin, Jones, T. D., Jones, W. G., McCardle, J., Sedgbeer, J. K., Thomas, J., Wan Abdullah, W. A. T., Bell, Kenneth Watson, Bowler, M. G., Bull, P., Cashmore, R. J., Clarke, P. E. L., Dauncey, Paul D., Devenish, R., Grossmann, P., Hawkes, C. M., Lloyd, S. L., Mellor, D., Youngman, C., Forden, G. E., Hart, J. C., Harvey, J., Hasell, D. K., Saxon, D. H., Woodworth, P. L., Barreiro, F., Brandt, S., Dittmar, M., Holder, M., Kreutz, G., Neumann, B., Duchovni, E., Eisenberg, Y., Karshon, U., Mikenberg, G., Mir, R., Revel, D., Shapira, A., Winik, M., Baranko, G., Caldwell, A., Cherney, Michael G., Izen, J. M., Mermikides, M., Ritz, S., Rudolph, G., Strom, David M., Takashima, M., Venkataramania, H., Wicklund, E., Wu, Sau Lan, and Zobernig, G.
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ELECTROPRODUCTION: LAMBDA ,JET: ELECTROPRODUCTION ,SCALING: VIOLATION ,DIFFERENTIAL CROSS SECTION ,POLARIZATION: LAMBDA ,ELECTROPRODUCTION: JET ,YIELD: (STRANGE PARTICLE) ,DESY PETRA STOR ,ANNIHILATION: ELECTRON POSITRON ,TRANSVERSE MOMENTUM ,ELECTRON POSITRON: COLLIDING BEAMS ,ELECTROPRODUCTION: K0 ,TASSO ,14: 22: 34 GEV-CMS ,K0: ELECTROPRODUCTION ,LAMBDA: ELECTROPRODUCTION ,RAPIDITY: SPECTRUM ,LAMBDA: POLARIZATION ,COLLIDING BEAMS: ELECTRON POSITRON ,EXPERIMENTAL RESULTS ,ELECTRON POSITRON: ANNIHILATION ,SPECTRUM: RAPIDITY - Abstract
The European physical journal / C 27(1), 27 - 37 (1985). doi:10.1007/BF01642477, Results onK0 and Λ production ine+e− annihilation at c.m. energies of 14, 22 and 34 GeV are presented. The shape of theK0 and Λ differential cross sections are very similar to each other and to those of π±,K± and\(p(\bar p)\). Scaling violations are observed forK0 production. We obtain a value for the probability to produce strange quark-antiquark pairs relative to that to produce up or down quark-antiquark pairs of 0.35±0.02±0.05. The value ofRh=σ(e+e-→hX)/σµµ is shown to rise steadily with c.m. energy for all particle species. At 34 GeV we find 1.48±0.05K0 and 0.31±0.03 Λ per event. We have searched for possible Λ polarization. The production ofK0's and Λ's in jets is examined as a function ofpT2 and rapidity and compared to that of all charged particles; the yields in two and three jets are also investigated. Results are presented from events with two baryons\((\Lambda ,\bar \Lambda ,por\bar p)\) observed., Published by Springer, Heidelberg
- Published
- 1985
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