Measurement of the pp annihilation cross-sections at very low energies

M. Agnello; F. Balestra; G. Belli; G. Bendiscioli; A. Bertin; P. Boccaccio; G. C. Bonazzola; T. Bressani; M. Bruschi; M. P. Bussa; L. Busso; D. Calvo; M. Capponi; M. Corradini; S. Costa; S. De Castro; D. D'Isep; I. V. Falomkin; L. Fava; A. Feliciello; L. Ferrero; V. Filippini; R. Garfagnini; U. Gastaldi; P. Gianotti; A. Grasso; C. Guaraldo; F. Iazzi; A. Lanaro; E. Lodi Rizzini; M. Lombardi; M. P. Macciotta; A. Maggiora; S. Marcello; U. Marconi; G. V. Margagliotti; G. Maron; M. Masala; A. Masoni; I. Massa; B. Minetti; M. Morando; M. Morganti; D. Panzieri; G. Pauli; M. Piccinini; R. Piragino; M. Poli; G. B. Pontecorvo; G. Puddu; R. A. Ricci; A. Rotondi; A. M. Rozhdestvensky; P. Salvini; L. Santi; M. G. Sapozhnikov; G. Sartori; N. Semprini-Cesari; S. Serci; F. Tosello; V. I. Tretyak; L. Vannucci; G. Vedovato; L. Venturelli; A. Vitale; A. Zenoni; A. Zoccoli; G. Zosi

doi:10.1016/0370-2693(91)91774-P

Measurement of the pp annihilation cross-sections at very low energies

M. Agnello
, F. Balestra
, G. Belli
, G. Bendiscioli
, A. Bertin
, P. Boccaccio
, G. C. Bonazzola
, T. Bressani
, M. Bruschi
, M. P. Bussa
, L. Busso
, D. Calvo
, M. Capponi
, M. Corradini
, S. Costa
, S. De Castro
, D. D'Isep
, I. V. Falomkin
, L. Fava
, A. Feliciello

L. Ferrero, V. Filippini, R. Garfagnini, U. Gastaldi, P. Gianotti, A. Grasso, C. Guaraldo, F. Iazzi, A. Lanaro, E. Lodi Rizzini, M. Lombardi, M. P. Macciotta, A. Maggiora, S. Marcello, U. Marconi, G. V. Margagliotti, G. Maron, M. Masala, A. Masoni, I. Massa, B. Minetti, M. Morando, M. Morganti, D. Panzieri, G. Pauli, M. Piccinini, R. Piragino, M. Poli, G. B. Pontecorvo, G. Puddu, R. A. Ricci, A. Rotondi, A. M. Rozhdestvensky, P. Salvini, L. Santi, M. G. Sapozhnikov, G. Sartori, N. Semprini-Cesari, S. Serci, F. Tosello, V. I. Tretyak, L. Vannucci, G. Vedovato, L. Venturelli, A. Vitale, A. Zenoni, A. Zoccoli, G. Zosi

Research output: Contribution to journal › Article › peer-review

Abstract

The pp annihilation cross-sections at 66.4-68.9-71.4 MeV/c have been measured using the presently instrumented part of the OBELIX spectrometer. The results have been obtained at p energies ( ≃ 2.5 MeV) by one order of magnitude smaller than in any existing experiment concerning the in-flight antiproton-proton annihilation. The average value obtained over the total interval 65.1-72.5 MeV/c, βσ_an^T = 33.2 ± 1.7 (stat.) ±1.8 (syst.) mb, in agreement with a specific calculation, would favour for the spin-averaged S-wave scattering length the value (-0.7 + i0.8) fm. The branching ratios for the annihilations in two, four and six charged mesons turn out to be quite similar to those for annihilation at rest in liquid hydrogen.

Original language	English
Pages (from-to)	349-353
Number of pages	5
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	256
Issue number	3-4
DOIs	https://doi.org/10.1016/0370-2693(91)91774-P
Publication status	Published - 14 Mar 1991
Externally published	Yes

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10.1016/0370-2693(91)91774-P

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Agnello, M., Balestra, F., Belli, G., Bendiscioli, G., Bertin, A., Boccaccio, P., Bonazzola, G. C., Bressani, T., Bruschi, M., Bussa, M. P., Busso, L., Calvo, D., Capponi, M., Corradini, M., Costa, S., De Castro, S., D'Isep, D., Falomkin, I. V., Fava, L., ... Zosi, G. (1991). Measurement of the pp annihilation cross-sections at very low energies. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 256(3-4), 349-353. https://doi.org/10.1016/0370-2693(91)91774-P

@article{58fcf0a86d97431585df5ee974602acb,

title = "Measurement of the pp annihilation cross-sections at very low energies",

abstract = "The pp annihilation cross-sections at 66.4-68.9-71.4 MeV/c have been measured using the presently instrumented part of the OBELIX spectrometer. The results have been obtained at p energies ( ≃ 2.5 MeV) by one order of magnitude smaller than in any existing experiment concerning the in-flight antiproton-proton annihilation. The average value obtained over the total interval 65.1-72.5 MeV/c, βσanT = 33.2 ± 1.7 (stat.) ±1.8 (syst.) mb, in agreement with a specific calculation, would favour for the spin-averaged S-wave scattering length the value (-0.7 + i0.8) fm. The branching ratios for the annihilations in two, four and six charged mesons turn out to be quite similar to those for annihilation at rest in liquid hydrogen.",

author = "M. Agnello and F. Balestra and G. Belli and G. Bendiscioli and A. Bertin and P. Boccaccio and Bonazzola, \{G. C.\} and T. Bressani and M. Bruschi and Bussa, \{M. P.\} and L. Busso and D. Calvo and M. Capponi and M. Corradini and S. Costa and \{De Castro\}, S. and D. D'Isep and Falomkin, \{I. V.\} and L. Fava and A. Feliciello and L. Ferrero and V. Filippini and R. Garfagnini and U. Gastaldi and P. Gianotti and A. Grasso and C. Guaraldo and F. Iazzi and A. Lanaro and \{Lodi Rizzini\}, E. and M. Lombardi and Macciotta, \{M. P.\} and A. Maggiora and S. Marcello and U. Marconi and Margagliotti, \{G. V.\} and G. Maron and M. Masala and A. Masoni and I. Massa and B. Minetti and M. Morando and M. Morganti and D. Panzieri and G. Pauli and M. Piccinini and R. Piragino and M. Poli and Pontecorvo, \{G. B.\} and G. Puddu and Ricci, \{R. A.\} and A. Rotondi and Rozhdestvensky, \{A. M.\} and P. Salvini and L. Santi and Sapozhnikov, \{M. G.\} and G. Sartori and N. Semprini-Cesari and S. Serci and F. Tosello and Tretyak, \{V. I.\} and L. Vannucci and G. Vedovato and L. Venturelli and A. Vitale and A. Zenoni and A. Zoccoli and G. Zosi",

year = "1991",

month = mar,

day = "14",

doi = "10.1016/0370-2693(91)91774-P",

language = "English",

volume = "256",

pages = "349--353",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier BV",

number = "3-4",

}

Agnello, M, Balestra, F, Belli, G, Bendiscioli, G, Bertin, A, Boccaccio, P, Bonazzola, GC, Bressani, T, Bruschi, M, Bussa, MP, Busso, L, Calvo, D, Capponi, M, Corradini, M, Costa, S, De Castro, S, D'Isep, D, Falomkin, IV, Fava, L, Feliciello, A, Ferrero, L, Filippini, V, Garfagnini, R, Gastaldi, U, Gianotti, P, Grasso, A, Guaraldo, C, Iazzi, F, Lanaro, A, Lodi Rizzini, E, Lombardi, M, Macciotta, MP, Maggiora, A, Marcello, S, Marconi, U, Margagliotti, GV, Maron, G, Masala, M, Masoni, A, Massa, I, Minetti, B, Morando, M, Morganti, M, Panzieri, D, Pauli, G, Piccinini, M, Piragino, R, Poli, M, Pontecorvo, GB, Puddu, G, Ricci, RA, Rotondi, A, Rozhdestvensky, AM, Salvini, P, Santi, L, Sapozhnikov, MG, Sartori, G, Semprini-Cesari, N, Serci, S, Tosello, F, Tretyak, VI, Vannucci, L, Vedovato, G, Venturelli, L, Vitale, A, Zenoni, A, Zoccoli, A & Zosi, G 1991, 'Measurement of the pp annihilation cross-sections at very low energies', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 256, no. 3-4, pp. 349-353. https://doi.org/10.1016/0370-2693(91)91774-P

TY - JOUR

T1 - Measurement of the pp annihilation cross-sections at very low energies

AU - Agnello, M.

AU - Balestra, F.

AU - Belli, G.

AU - Bendiscioli, G.

AU - Bertin, A.

AU - Boccaccio, P.

AU - Bonazzola, G. C.

AU - Bressani, T.

AU - Bruschi, M.

AU - Bussa, M. P.

AU - Busso, L.

AU - Calvo, D.

AU - Capponi, M.

AU - Corradini, M.

AU - Costa, S.

AU - De Castro, S.

AU - D'Isep, D.

AU - Falomkin, I. V.

AU - Fava, L.

AU - Feliciello, A.

AU - Ferrero, L.

AU - Filippini, V.

AU - Garfagnini, R.

AU - Gastaldi, U.

AU - Gianotti, P.

AU - Grasso, A.

AU - Guaraldo, C.

AU - Iazzi, F.

AU - Lanaro, A.

AU - Lodi Rizzini, E.

AU - Lombardi, M.

AU - Macciotta, M. P.

AU - Maggiora, A.

AU - Marcello, S.

AU - Marconi, U.

AU - Margagliotti, G. V.

AU - Maron, G.

AU - Masala, M.

AU - Masoni, A.

AU - Massa, I.

AU - Minetti, B.

AU - Morando, M.

AU - Morganti, M.

AU - Panzieri, D.

AU - Pauli, G.

AU - Piccinini, M.

AU - Piragino, R.

AU - Poli, M.

AU - Pontecorvo, G. B.

AU - Puddu, G.

AU - Ricci, R. A.

AU - Rotondi, A.

AU - Rozhdestvensky, A. M.

AU - Salvini, P.

AU - Santi, L.

AU - Sapozhnikov, M. G.

AU - Sartori, G.

AU - Semprini-Cesari, N.

AU - Serci, S.

AU - Tosello, F.

AU - Tretyak, V. I.

AU - Vannucci, L.

AU - Vedovato, G.

AU - Venturelli, L.

AU - Vitale, A.

AU - Zenoni, A.

AU - Zoccoli, A.

AU - Zosi, G.

PY - 1991/3/14

Y1 - 1991/3/14

N2 - The pp annihilation cross-sections at 66.4-68.9-71.4 MeV/c have been measured using the presently instrumented part of the OBELIX spectrometer. The results have been obtained at p energies ( ≃ 2.5 MeV) by one order of magnitude smaller than in any existing experiment concerning the in-flight antiproton-proton annihilation. The average value obtained over the total interval 65.1-72.5 MeV/c, βσanT = 33.2 ± 1.7 (stat.) ±1.8 (syst.) mb, in agreement with a specific calculation, would favour for the spin-averaged S-wave scattering length the value (-0.7 + i0.8) fm. The branching ratios for the annihilations in two, four and six charged mesons turn out to be quite similar to those for annihilation at rest in liquid hydrogen.

AB - The pp annihilation cross-sections at 66.4-68.9-71.4 MeV/c have been measured using the presently instrumented part of the OBELIX spectrometer. The results have been obtained at p energies ( ≃ 2.5 MeV) by one order of magnitude smaller than in any existing experiment concerning the in-flight antiproton-proton annihilation. The average value obtained over the total interval 65.1-72.5 MeV/c, βσanT = 33.2 ± 1.7 (stat.) ±1.8 (syst.) mb, in agreement with a specific calculation, would favour for the spin-averaged S-wave scattering length the value (-0.7 + i0.8) fm. The branching ratios for the annihilations in two, four and six charged mesons turn out to be quite similar to those for annihilation at rest in liquid hydrogen.

UR - https://www.scopus.com/pages/publications/0000717181

U2 - 10.1016/0370-2693(91)91774-P

DO - 10.1016/0370-2693(91)91774-P

M3 - Article

SN - 0370-2693

VL - 256

SP - 349

EP - 353

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

IS - 3-4

ER -

Measurement of the pp annihilation cross-sections at very low energies

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