P- versus S-wave pp-annihilation at rest in LH2

C. Amsler, I. Augustin, C. A. Baker, B. M. Barnett, C. J. Batty, K. Beuchert, P. Birien, J. Bistirlich, P. Blüm, R. Bossingham, H. Bossy, K. Braune, J. Brose, D. V. Bugg, M. Burchell, T. Case, A. Cooper, K. M. Crowe, H. P. Dietz, S. von DombrowskiM. Doser, W. Dünnweber, D. Engelhardt, M. Englert, M. A. Faessler, C. Felix, G. Folger, R. Hackmann, R. P. Haddock, F. H. Heinsius, N. P. Hessey, P. Hidas, P. Illinger, D. Jamnik, H. Kalinowsky, B. Kämmle, T. Kiel, J. Kisiel, E. Klempt, M. Kobel, H. Koch, C. Kolo, K. Königsmann, M. Kunze, R. Landua, J. Lüdemann, H. Matthaey, M. Merkel, J. P. Merlo, C. A. Meyer, U. Meyer-Berkhout, L. Montanet, A. Noble, K. Peters, G. Pinter, S. Ravndal, A. H. Sanjari, E. Schäfer, B. Schmid, P. Schmidt, S. Spanier, C. Straßburger, U. Strohbusch, M. Suffert, D. Urner, C. Völcker, F. Walter, D. Walther, U. Wiedner, N. Winter, J. Zoll, Č Zupančič

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Abstract

The annihilation pp→π0π0 was measured for antiprotons stopped in liquid hydrogen (LH2). This reaction is only allowed from odd angular momentum states of the pp-atom. The resulting branching ratio BR(pp→π0π0)LH2=(6 .93±0.22stat±0.37syst)×10 -4, combined with a previous measurement of the branching ratio BR(pp→π+π-)2P in gas from the 2P-state of pp suggests a fraction of P-wave annihilation in LH2 of (28.8±3.5)%, much larger than the values obtained from other annihilation channels. A method of reconciling the contradictory results is discussed.

Original languageEnglish
Pages (from-to)214-218
Number of pages5
JournalPhysics Letters B
Volume297
Issue number1-2
DOIs
Publication statusPublished - Dec 24 1992

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ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Amsler, C., Augustin, I., Baker, C. A., Barnett, B. M., Batty, C. J., Beuchert, K., Birien, P., Bistirlich, J., Blüm, P., Bossingham, R., Bossy, H., Braune, K., Brose, J., Bugg, D. V., Burchell, M., Case, T., Cooper, A., Crowe, K. M., Dietz, H. P., ... Zupančič, Č. (1992). P- versus S-wave pp-annihilation at rest in LH2. Physics Letters B, 297(1-2), 214-218. https://doi.org/10.1016/0370-2693(92)91095-Q