Diffraction dissociation in 205 GeV/c $pi$$sup -$p two- and four-prong interactions Page: 2 of 27
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LBL-2112
the last 11 cm along the beam) was used in this analysis in order to insure
more accurate reconstruction of fast forward tracks. The events were measured
. film-plane measuring projectors. Bubble density patterns were compared in
each view in order to ensure proper track matching. Geometrical and kinematic
fitting were performed with the standard programs TVcP and SQUAW.
II. DISCUSSION OF CONSTRAINED FITS
The constrained fits considered in the analysis wezv the following,
ztPp - JP , ,l)
p - n nrn*p , (2)
both nominally 4-constraint fits. Although eanstic scattering reaction (1)1
is not discussed in this paper, the problem of separating inelastic from
elastic two-prong events is relevant to our considerations, At intermediate
energies (PL : 10 GeV/c), the four-constraint fits are suffictently powerful,
particularly if coupled to bubble density information, to identify with very
little ambiguity the real examples of reactions (1) and (2). At L105 4eV/c,
however, momentum measurement uncertainties are such as to require further
study of the validity of the fits and the magnitude of background included
in them.
Such & study was carried out in the following manner. We computed
directly from the measurements the following quantities:
(a) The mass squared, M-, recoiling against the proton (2-prong events) or
recoiling against the combination--proton plus two slowest pions (4-prong
events). For the real examples of reactions (1) or (2), this quantity
must, within the errors, agree with the mass sqatred of a pion, 0.019 (eV2,
The error width in t4? is typically 1. Ge$ and is largely determined by
the uncertainty in the direction of the recoil proton.
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Abrams, G. S.; Bingham, H. H. & Chew, D. M. Diffraction dissociation in 205 GeV/c $pi$$sup -$p two- and four-prong interactions, article, August 10, 1973; Berkeley, California. (https://digital.library.unt.edu/ark:/67531/metadc1021513/m1/2/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.