On the origin of small-pT direct electrons in pp collisions

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The possible charm origin of the rapid increase at small pT of the pp electron yield is discussed in the light of recent e+e- data bearing on charm decays. The charm decay electron spectrum required for a quantitative interpretation of the effect is found to be significantly consistent with the mome...

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Autor principal: Ferro Fontán, Constantino
Otros Autores: Odorico, R.
Formato: Capítulo de libro
Lenguaje:Inglés
Publicado: Società Italiana di Fisica 1977
Acceso en línea:Registro en Scopus
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Biblioteca Central Dr. Luis F. Leloir (FCEN) de Universidad de Buenos Aires
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040 |a Scopus  |b spa  |c AR-BaUEN  |d AR-BaUEN 
100 1 |a Ferro Fontán, Constantino 
245 1 3 |a On the origin of small-pT direct electrons in pp collisions 
260 |b Società Italiana di Fisica  |c 1977 
270 1 0 |m Ferro Fontán, C.; Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina 
504 |a Baum, L., Block, M.M., Couchman, B., Crawford, J., Derevshchikov, A., Dibitonto, D., Golutvin, I., Voss, R., (1976) Phys. Lett., 60 B, p. 485 
504 |a Hinchliffe, I., Llewellyn-Smith, C.H., (1976) Phys. Lett., 61 B, p. 472 
504 |a Bourquin, M., Gaillard, J.M., (1976) Nucl. Phys., 114 B, p. 334 
504 |a Gaillard, M.K., Lee, B.W., Rosner, J.L., (1975) Rev. Mod. Phys., 47, p. 277 
504 |a Craigie and Schildknecht (5) have shown that the contribution from the low-mass tail of the ρ-meson may be important at low p<inf>T</inf>. Its strength and shape, however, are not such to appreciably ease these difficulties; Cragie, N.S., Schildknecht, D., A reappraisal of known sources of prompt electrons and photons from hadron collisions (1977) Nuclear Physics B, 118 B, p. 311 
504 |a Goldhaber, G., Pierre, F.M., Abra, G.S., Alam, M.S., Boyarski, A.M., Breidenbach, M., Carithers, W.C., Wiss, J.E., (1976) Phys. Rev. Lett., 37, p. 255 
504 |a Peruzzi, I., Piccolo, M., Feldman, G.J., Nguyen, H.K., Wiss, J.E., Abra, G.S., Alam, M.S., Whitaker, J.S., (1976) Phys. Rev. Lett., 37, p. 569 
504 |a Knapp, B., Lee, W., Leung, P., Smith, S.D., Wijangco, A., Knauer, J., Yount, D., Peoples, J., (1976) Phys. Rev. Lett., 37, p. 882 
504 |a Braunschweig, W., Martyn, H.U., Sander, H.G., Schmitz, D., Sturm, W., Wallraff, W., Cords, D., Yamada, S., (1976) Phys. Lett., 63 B, p. 471 
504 |a Burmester, J., Criegee, L., Dehne, H.C., Derikum, K., Devenish, R., Fox, J.D., Franke, G., Wacker, K., (1976) Phys. Lett., 64 B, p. 369 
504 |a B. H. Wiik: Invited paper at the XVIII International Conference on High-Energy Physics (Tbilisi, 1976); Early evidence has been found in neutrino-produced dimuon (12) and μe (13) events, and in μ-produced dimuon events (14); Benvenuti, A., Cline, D., Ford, W.T., Imlay, R., Ling, T.Y., Mann, A.K., Messing, F., Wanderer, P., (1975) Phys. Rev. Lett., 34, p. 419 
504 |a Von Krogh, J., Fry, W., Camerini, U., Cline, D., Loveless, R.J., Mapp, J., March, R.H., Stenger, V., (1976) Phys. Rev. Lett., 36, p. 710 
504 |a K. W. Chen: Proceedings of the International Conference on the Production of Particles with New Quantum Numbers (Madison, Wis., 1976), p. 222; V. Barger, T. Gottschalk and R. J. N. Phillips: Madison report COO-569 (1976); Barger, V., Gottschalk, T., Phillips, R.J.N., (1976) Phys. Lett., 64 B, p. 333 
504 |a Kajantie (17,18) has recently considered in this spirit data on the hadronic production of lepton pairs. See sect. 4; Kajantie, K., (1976) Phys. Lett., 65 B, p. 69 
504 |a K. Kajantie: invited talk at the International Summer Institute for Theoretical Physics (Bielefeld, 1976); University of Helsinki report 19-76 (1976); R. Devenish: report at the XVIII International Conference on High-Energy Physics (Tbilisi, 1976), as quoted in ref. (15); Kasha, H., Kellog, R.G., Lauterbach, M.J., Adair, R.K., Leipuner, L.B., Larsen, R.C., Stefanski, R.J., (1976) Phys. Rev. Lett., 36, p. 1007 
504 |a Anderson, K.J., Henry, G.G., McDonald, K.T., Pilcher, J.E., Rosenberg, E.I., Branson, J.G., Sanders, G.H., Thaler, J.J., (1976) Phys. Rev. Lett., 37, p. 803 
504 |a Branson, J.C., Sanders, G.H., Smith, A.J.S., Thaler, J.J., Anderson, K.J., Henry, G.G., McDonald, K.T., Rosenberg, E.I., (1977) Phys. Rev. Lett., 38, p. 457 
504 |a Cahn, R.N., (1973) Phys. Rev. D, 7, p. 247 
504 |a J. D. Jackson: lectures at the SLAC Summer Institute on Particle Physics (1976), Larence Berkeley Laboratory report LBL-5500 (1976); O. Botner and N. Brene: Niels Bohr Institute report NBI-HE-76-11 (1976); Krzywicki, A., Weingarten, D., (1974) Phys. Lett., 50 B, p. 265 
504 |a Kajantie, K., Karimaki, V., (1971) Comp. Phys. Comm., 2, p. 207 
504 |a Kajantie, K., Karimaki, V., (1971) Comp. Phys. Comm., 2, p. 207 
504 |a C. Ferro Fontán: to be published; Barger, V., Phillips, R.J.N., (1976) Phys. Rev. D, 14, p. 80 
504 |a Barger, V., Phillips, R.J.N., (1976) Phys. Rev. D, 14, p. 80 
504 |a Kajantie (18), from a fit to the same data, involving the Kev, K*(890) ν and K*(1.4)e ν decay modes of the D-meson, finds B<inf>e</inf>σ=76 µb; Siegrist, J., Abra, G.S., Boyarski, A.M., Breidenbach, M., Bulos, F., Chinowsky, W., Feldman, G.J., Wiss, J.E., (1976) Phys. Rev. Lett., 36, p. 700 
504 |a For a recent review see ref. (31); K. C. Stanfield: rapporteur’s talk at the Meeting of Division of Particles and Fields, Brookhaven National Laboratory (October 1976), Purdue University report COO-1428-439 (1976); Alder, J., Block, M., Böhm, A., Ceradini, F., Di Bitonto, D., Joseph, C., Kernan, A., Zupancic, C., (1977) Phys. Lett., 66 B, p. 401 
504 |a Bintinger, D., Lundy, R.A., Yovanovitch, D.D., Akerlof, C.W., Alley, P., Koltick, D., Loveless, R.L., Stanfield, K.C., (1976) Phys. Rev. Lett., 37, p. 732 
504 |a Coremans-Bertrand, G., Sacton, J., Breslin, A., McMahon, G., Montwill, A., Davis, D.H., Tovee, D.N., Pniewski, T., (1976) Phys. Lett., 65 B, p. 480 
504 |a Beier, E.W., Patton, R., Raychaudhuri, K., Takeda, H., Thern, R., Van Berg, R., Weisberg, H., Kirz, J., (1976) Phys. Rev. Lett., 37, p. 1117 
504 |a Guy, J., Kalmus, G., Suk, M., Tuli, S., Fisher, C.M., Borreani, G., Marchetto, F., Rianudo, G., (1977) Phys. Lett., 66 B, p. 300 
504 |a Browman, A., Frank, J.S., Hoffman, C.M., Howard, H.H., Mischke, R.E., Moir, D.C., Nagle, D.E., McFarlane, W.K., (1976) Phys. Rev. Lett., 37, p. 246 
504 |a Anderson, K.J., Henry, G.G., McDonald, K.T., Pilcher, J.E., Rosenberg, E.I., Branson, J.G., Sanders, G.H., Thaler, J.J., (1976) Phys. Rev. Lett., 37, p. 799 
504 |a J. Kirkby: talk at the International Symposium on Lepton and Photon Interactions at High Energies (Hamburg, 1977); A. Litke: talk at the European Conference on Particle Physics (Budapest, 1977); L. Galtieri: talk at the International Symposium on Lepton and Photon Interaction at High Energies (Hamburg, 1977); U. Timm: talk at the European Conference on Particle Physics (Budapest, 1977); DESY report 77/52 (1977); M. Block, A. Böhm, F. Ceradini, D. DiBitonto, J. Irion, A. Kernan, J. Layter, F. Muller, A. Nakkasyan, B. Naroska, F. Navach, M. Nussbaum, A. Orkin-Lecourtois, C. Rubbia, M. Sachwitz, D. Schinzel, H. Seerbrunner, B. Shen, A. Staude, R. Tirler, G. Van Dalen and R. Voss: CERN preprint, submitted to Nucl. Phys., B (August 1977); The chosen normalization corresponds to a B<inf>e</inf>σ=7.4 µb. With B<inf>e</inf>=(10±2)%, as measured by DELCO (39) (in agreement, within errors, with the independent determinations of DASP 43) and the Lead Glass Wall collaboration (40) this impies σ ≃ 74 µb (at √s=53 GeV); S. Yamada: talk at the International Symposium on Lepton and Photon Interactions at High Energies (Hamburg, 1977) 
506 |2 openaire  |e Política editorial 
520 3 |a The possible charm origin of the rapid increase at small pT of the pp electron yield is discussed in the light of recent e+e- data bearing on charm decays. The charm decay electron spectrum required for a quantitative interpretation of the effect is found to be significantly consistent with the momentum distribution of the e+e- anomalous electron-plus-hadron events observed at DORIS. The amount of the charm cross-section times the branching ratio, Be σ, demanded by the pp → e + X data is compatible with existing experimental upper limits, once the recent experimental information on charm decays is taken into account. Since charm-originated leptons are limited to very small Feynman x, there is no conflict with the reported evidence for a pair origin of near-forward produced leptons. See note added in proof for revised conclusions based on new e+e- data. © 1977 Società Italiana di Fisica.  |l eng 
593 |a Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina 
593 |a Istituto di Fisica Teorica dell'Università, Trieste, Italy 
593 |a Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, Italy 
700 1 |a Odorico, R. 
773 0 |d Società Italiana di Fisica, 1977  |g v. 42  |h pp. 141-159  |k n. 1  |p Nuov Cim A  |x 03693546  |w (AR-BaUEN)CENRE-2203  |t Il Nuovo Cimento A 
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