107 research outputs found
PROPOSAL TO CONTINUE THE STUDY OF CHARMONIUM SPECTROSCOPY IN PROTON-ANTIPROTON ANNIHILATIONS (Revised proposal P-835)
No full textP. Rapidis 1 , R. Ray 1 , J. Reid 6; , G. Rinaudo 7 , B. Roccuzzo 7 , J. Rosen 5 , A. Santroni 3 , M. Sarmiento 5 , M. Savrie' 2 , J. Schultz 4 , K.K. Seth 5 , A. Smith 4; , G.A. Smith 6 , M. Sozzi 7 , S. Trokenheim 5; , S. Werkema 1 , Y. Zhang 6 , J. Zhao 5; , G. Zioulas 4 . 1 Fermi National Accelerator Laboratory, Batavia, Illinois 60510, U.S.A. 2 I.N.F.N. and University of Ferrara, 44100 Ferrara, Italy 3 I.N.F.N. and University of Genoa, 16146 Genoa, Italy 4 University of California at Irvine, California 92717, U.S.
Antiatom-atom Scattering With The Close-coupling Model
No full textCollisions involving atoms and antiatoms have been investigated at low incident energies using close-coupling approximation (CCA). We investigate ortho-positronium-ortho-positronium (o-Ps-o-Ps) scattering up to incident energy 3.4 eV. Antihydrogen-hydrogen elastic scattering has been studied in the energy range 10-10 to 10-2 a.u., whereas antihydrogen-helium system has been investigated in the range 10-16 to 10-2 a.u. The s-wave elastic scattering parameters, viz., scattering length, effective range, phase shift, cross section etc., have been reported. The present predictions have been compared with the other corresponding theoretical predictions wherever available. Usefulness of CCA model to investigate these systems at thermal energies has been emphasized. © 2004 Elsevier B.V. All rights reserved.2211-41220Liang, E.P., Dermer, C.D., (1988) Opt. Commun., 65, p. 454Platzmann, P.M., Mill Jr., A.P., (1994) Phys. Rev. B, 49, p. 454Cassidy, D.B., Golovchenko, J.A., (2001) New Directions in Antimatter Chemistry and Physics, , C.M. Surko, & F.A. Gianturco. The Netherlands: Kluwer Academic PublishersSaito, H., Hyodo, T., (2001) New Directions in Antimatter Chemistry and Physics, , C.M. Surko, & F.A. Gianturco. The Netherlands: Kluwer Academic PublishersShumway, J., Ceperley, D.M., (2001) Phys. Rev. B, 63, p. 165209Ivanov, I.A., Mitroy, J., Varga, K., (2002) Phys. Rev. A, 65, p. 022704Damburg, R.J., Karule, E., (1967) Proc. Phys. Soc., 90, p. 637Ivanov, I.A., Mitroy, J., Varga, K., (2001) Phys. Rev. Lett., 87, p. 063201Oda, K., Miyakawa, T., Yabu, Y., Suzuki, T., (2001) J. Phys. Soc. Jpn., 70, p. 1549Baur, G., (1996) Phys. Lett. B, 368, p. 251Blanford, G., Christian, D.C., Gollwitzer, K., Mandelkern, M., Munger, C.T., Schultz, J., Zioulas, G., (1998) Phys. Rev. Lett., 80, p. 3037Amoretti, M., (2002) Nature (London), 419, p. 456Gabrielse, G., (2002) Phys. Rev. Lett, 89, p. 213401Gabrielse, G., (2002) Phys. Rev. Lett, 89, p. 233401Armour, E.A.G., Carr, V., Zeeman, V., (1998) J. Phys. B, 31, pp. L679Froelich, P., Jonsell, S., Saenz, A., Zygelman, B., Dalgarno, A., (2000) Phys. Rev. Lett., 84, p. 4577Jonsell, S., Saenz, A., Froelich, P., Zygelman, B., Dalgarno, A., (2001) Phys. Rev. A, 64, p. 052712Armour, E.A.G., Chamberlain, C.W., (2001) New Directions in Antimatter Chemistry and Physics, , C.M. Surko, & F.A. Gianturco. The Netherlands: Kluwer Academic PublishersArmour, E.A.G., Chamberlain, C.W., (2002) J. Phys. B, 35, p. 489Sinha, P.K., Ghosh, A.S., (2000) Euro. Phys. Lett., 49, p. 558Sinha, P.K., Chaudhuri, P., Ghosh, A.S., (2003) Phys. Rev. A, 67, p. 052509Sinha, P.K., Chaudhuri, P., Ghosh, A.S., (2004) Phys. Rev. A, 69, p. 014701Sinha, P.K., Ghosh, A.S., (2003) Phys. Rev. A, 68, p. 022504Winter, T.G., Lin, C.C., (1975) Phys. Rev. A, 12, p. 434Strasburger, K., Chojnacki, H., (2002) Phys. Rev. Lett., 88, p. 16320
A NEW MEASUREMENT OF THE PROTON ELECTROMAGNETIC FORM-FACTOR IN THE TIME-LIKE REGION AT HIGH-ENERGY RID C-5223-2009
No full textWe have determined the value of the proton electromagnetic form factor in the time-like region at -q2 = 12.6 (GeV/c)2. The events ppBAR --> e+e- from the data collected by the E760 experiment. performed at the Antiproton Accumulator Ring at Fermilab, were used. At the value of -q2, assuming the possibility of neglecting the \G(E)\ contribution to the cross section, we found \G(M) \ = 0.0015 +/- 0.003 and sigma(TOT) (ppBAR --> e+e-) = 1.9 +/- 0.8 pb
PROTON ELECTROMAGNETIC FORM-FACTORS IN THE TIME-LIKE REGION FROM 8.9 TO 13.0 GEV(2) RID C-5223-2009
No full textCross sections for the reaction ppBAR --> e+e- have been measured at s = 8.9, 12.4, and 13.0 GeV2. The cross sections have been analyzed to obtain the proton electromagnetic form factors in the timelike region. We find that G(M)(q2) is-proportional-to q-4alpha(s)2(q2) for q2 greater-than-or-equal-to 5 (GeV/c)2
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