Single and double pion production from 800 MeV proton-proton collisions

Cverna, F. H.; Bevington, P. R.; McNaughton, M. W.; Willard, H. B.; King, N.S.P.; Giebink, David R.

doi:10.1103/physrevc.23.1698

Cited by 21 publications

(16 citation statements)

References 20 publications

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“…By use of different models (see below) in the MC simulations, we estimate systematic errors of these corrections to be below 5%. The obtained integral cross sections in the overlap region are approximately an order of magnitude below previous bubble chamber data [7], however, in tentative accordance with the LAMPF datum [4] at T p 800 MeV (Fig. 1).…”

supporting

confidence: 89%

“…All previous data on this reaction below T p 900 MeV stem from inclusive magnetic spectrometer measurements [4,5] or low-statistics bubble chamber experiments [6][7][8], which partly have also been inclusive [7,8]. We have carried out high-statistics exclusive measurements of the pp !…”

mentioning

confidence: 99%

“…We stress that the cross sections for single meson production measured during the beamtime periods for pp production or measured in dedicated runs agree very well (see, e.g., [14 -16]) with the world database on these reactions. [4] (asterisks), [5] (diamonds), [8] (triangles), [6] (squares), and [7] (circles). The dotted line shows the pure phase space behavior normalized arbitrarily; solid and dashed lines represent theoretical predictions [1] with and without pp FSI, respectively.…”

mentioning

confidence: 99%

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Exclusive Measurement of thepp→ppπ+π−Reaction Near Threshold

Brodowski

Bilger²,

Calén³

et al. 2002

Phys. Rev. Lett.

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The pp-->pp pi(+) pi(-) reaction has been measured exclusively near threshold at CELSIUS. The total cross sections are nearly an order of magnitude lower than expected from previous inclusive measurements. The differential cross sections reveal pp-->pp(*)(1440)-->pp sigma = pp(pi(+)pi(-))(I = l = 0) as the dominant process as well as significant contributions from p(*)-->Delta(++)pi(-)-->psigma. The observed anisotropy in the proton angular dependence is consistent with heavy-meson exchange. In the invariant mass spectra, no narrow structures of statistical relevance (3sigma) are found.

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supporting

confidence: 89%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Exclusive Measurement of thepp→ppπ+π−Reaction Near Threshold

Brodowski

Bilger²,

Calén³

et al. 2002

Phys. Rev. Lett.

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“…These calculations are compared in Figs. 1 and 2 with the available total cross section data [11,12,13,14,15,16,17,18,19,20] including the new data from this work for the energy region from threshold up to T p = 2.2 GeV. Beyond this energy the available sparse data indicate that the cross sections essentially saturate.…”

mentioning

confidence: 78%

“…The other previous data denoted by open symbols in Figs. 1 -4 are bubble chamber results, partly of very low statistics, or single-arm magnetic spectrometer measurements from LAMPF [12,13].…”

mentioning

confidence: 99%

Two-pion production in proton–proton collisions — experimental total cross sections and their isospin decomposition

et al. 2009

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The two-pion production in pp-collisions has been investigated at CELSIUS in exclusive measurements from threshold up to Tp = 1.36 GeV. Total and differential cross sections have been obtained for the channels pnπ + π 0 , ppπ + π − , ppπ 0 π 0 and also nnπ + π + . For intermediate incident energies Tp > 1 GeV, i.e. in the region which is beyond the Roper excitation but at the onset of ∆∆ excitation, the total ppπ 0 π 0 cross section falls behind theoretical predictions by as much as an order of magnitude near 1.2 GeV, whereas the nnπ + π + cross section is a factor of five larger than predicted. An isospin decompostion of the total cross sections exhibits a s-channel-like energy dependence in the region of the Roper excitation as well as a significant contribution of an isospin 3/2 resonance other than the ∆(1232). As possible candidates the ∆(1600) and the ∆(1700) are discussed.Two-pion production in nucleon-nucleon collisions is an outstanding subject, since it connects ππ dynamics with baryon and baryon-baryon degrees of freedom. There is increasing evidence that the puzzling ABC effect observed in doublepionic fusion reactions may possibly be traced back to an isoscalar resonance phenomenon as source for the peculiar pion pair production in the ππ scalar-isoscalar state [1,2,3,4]. By contrast the isovector ππ channel in double-pionic fusion be-haves regularily, i.e. shows no ABC effect and follows the expectations from conventional t-channel ∆∆ calculations [5].In view of the challenging explanation [2,3,4] offered for the ABC effect it is interesting to study for comparison the behavior of ππ production in isoscalar, isovector and isotensor ππ channels in those cases, where the two actively participating nucleons do not fuse into a final nuclear bound system. From previous work it is known that the 1

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