The pp → ppπ0π0 reaction and its limiting case, fusion to quasi-bound 2He, in search of the ABC effect

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The pp → ppπ⁰π⁰ reaction and its limiting case, fusion to quasi-bound ²He, in search of the ABC effect

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

Published copy (DOI)

10.1142/S0217751X1105258X

Author(s)

T. Skorodko
D. Bogoslowsky
H. Calén
H. Clement
E. Doroshkevich
C. Ekström
K. Fransson
L. Gustafsson
B. Höistad
G. Ivanov
M. Jacewicz
E. Jiganov
T. Johansson
S. Keleta
O. Khakimova
I. Koch
F. Kren
S. Kullander
A. Kupść
A. Kuznetsov
P. Marciniewski
R. Meier
B. Morosov
C. Pauly
H. Petterson
Y. Petukhov
A. Povtorejko
A. Pricking
R. J.M.Y. Ruber
K. Schönning
W. Scobel
B. Shwartz
V. Sopov
J. Stepaniak
P. Thörngren-Engblom
V. Tikhomirov
A. Turwiecki
G. J. Wagner
M. Wolke
A. Yamamoto
J. Zabierowskf
J. Złomanćzuk

Department/unit(s)

Physics

Publication details

Journal	International Journal of Modern Physics A
Date	Published - 10 Feb 2011
Issue number	3-4
Volume	26
Number of pages	3
Pages (from-to)	702-704
Original language	English

Abstract

The π⁰π⁰ production in pp-collisions has been investigated in exclusive and kinematically complete measurements from threshold up to T_p = 1.4 GeV. For incident energies T_p > 1 GeV, i.e. in the region beyond the Roper excitation, the ΔΔ excitation process takes over. The data are well explained by the t-channel ΔΔ process dominated by pion exchange. There is no low-mass enhancement (ABC effect) in the π⁰π⁰-invariant mass distribution beyond that given by the conventional t-channel ΔΔ process. This is also true for the limiting case, where the protons are in the quasi-bound ²He state.

Research areas

ΔΔ excitation, ABC effect, quasibound He, t-channel ΔΔ process

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