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Comment on "Total and differential cross sections of p+p to pi /sup +/+d |
Author
Blomgren J. Olsson N. Drochner M. Ernst J. Fortsch S. Freindl L. Frekers D. Garske W. Hawash M. Igel S. Jahn R. Jarczyk L. Kemmerling G. Kilian K. Kliczewski S. Klimala W. Kolev D. Kutsarova T. Lipp
rt G. Machner H. Maier R. Nake C. Razen B. von Rossen P. Scho K. Siudak R. Smyrski J. Strzalkowski A. Tsenov R. Zolnierczuk PA. Zwoll K.
Institution
Dept. of Neutron Res., Uppsala Univ., Sweden.
Title
Comment on "Total and differential cross sections of p+p to pi /sup +/+d
reactions down to 275 keV above threshold" and reply.
Source
Physical Review Letters, vol.83, no.8, 23 Aug. 1999, pp.1692-3. Publisher:
APS, USA.
Abstract
In a recent article (see ibid., vol. 77, p. 454 (1996)), new high-quality data on the pp to d pi /sup +/ total cross section close to threshold are being compared with data on the np to d pi /sup 0/
reaction as a means to study possible violations of isospin independence. A major problem with this approach is the absolute normalization of the np to d pi /sup 0/ data of Hutcheon et al. (1991). T
e data were measured relative to np scattering, by a simultaneous detection of the recoil proton in the same magnetic spectrometer. The np scattering cross section assumed in the normalization was t
ken from the VPI program SAID, which provides well-known and commonly used phase-shift analyses of NN scattering data. Hutcheon et al. estimated the uncertainty in this normalization procedure to be
5%, which made sense at that time. However, recent experimental results indicate that the np scattering cross section close to 180 degrees can be uncertain by as much as 10%-15% in this energy regio
. Drochner et al. reply to this Comment. (18 References).
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Timo Kellmann
automatically created: July 2001
