120570560
Measurements of pion charge exchange and other things at Fermilab energies
123273188
COMPARISON OF HIGH TRANSVERSE MOMENTUM PI0 PRODUCTION FROM PI-, K-, P, AND ANTI-P BEAMS.
We compare high-transverse-momentum (P/sub perpendicular/) inclusive ..pi../sup 0/ production from ..pi../sup -/, K/sup -/, p, and p beams, at 100 and 200 GeV/c, for center-of-mass (c.m.) angles ranging from 2/sup 0/ to 115/sup 0/, and P/sub perpendicular/ .. ..pi../sup 0/X)/sigma (..pi..p ..-->.. ..pi../sup 0/X) decreases with increasing P/sub perpendicular/, and changes dramatically with c.m. angle. Also, the ratios sigma (K/sup -/p ..-->.. ..pi../sup 0/X)/sigma (..pi../sup -/p ..-->.. ..pi../sup 0/X) and sigma (pp ..-->.. ..pi../sup 0/X)/sigma (pp ..-->.. /sup 0/X) are approximately constant. The measurements are consistent with a theoretical viewpoint in which constituents of the incident hadrons undergo a hard-scattering subprocess.
121878723
Studies of parton fragmentation and baryon production with the TPC at PEP
Results are presented from the TPC on the analysis of 3-jet events, on the width of gluon jets versus quark jets, and on proton and lambda production and correlations.
123442940
The initial neutrino events from supernovae as evidence for matter versus antimatter
122426348
Pion Charge Exchange Scattering at High-Energies
We report on a study of pion charge-exchange scattering carried out at Fermilab in the energy range 20 to 200 GeV. The results can be described remarkably well by a simple Regge-pole model. The charge-exchange cross sections in the forward direction lead to a prediction for the difference in total cross sections of ..pi../sup -/p and ..pi../sup +/p which is in satisfactory agreement with direct measurements of this difference in another experiment at Fermilab. (AIP)
118861611
Observation of inclusive. omega. production at large transverse momentum
We have observed the production of ..omega.. mesons at large transverse momentum produced in 200-GeV/c pBe interactions. The ratio of inclusive production of ..omega.. to ..pi../sup 0/ at transverse momenta above 2.2 GeV/c is 0.44 +- 0.08 near x=0. The upper limit for eta' to eta production is <1.4 in the same kinematic region.
118984350
Comment on"Conformally flat stationary axisymmetric metrics"
Garcia and Campuzano claim to have found a previously overlooked family of stationary and axisymmetric conformally flat spacetimes, contradicting an old theorem of Collinson. In both these papers it is tacitly assumed that the isometry group is orthogonally transitive. Under the same assumption, we point out here that Collinson's result still holds if one demands the existence of an axis of symmetry on which the axial Killing vector vanishes. On the other hand if the assumption of orthogonal transitivity is dropped, a wider class of metrics is allowed and it is possible to find explicit counterexamples to Collinson's result.
125608804
Note 65.39: Inverse and reciprocal functions
120435397
Irrotational perfect fluids with a purely electric Weyl tensor
All perfect fluid spacetimes with a purely electric Weyl tensor are shown to have an alignment between the fluid 4-velocity and a canonical null tetrad determined by the Weyl tensor. If, in addition, it is assumed that the flow is irrotational, the eigenframes of the shear and Weyl tensors coincide. In all but two rather special cases, it is proved that the vectors of this eigenframe are hypersurface orthogonal and consequently that a coordinate system exists in which the metric, shear and Eab (the electric part of the Weyl tensor) are all diagonal. Geodesic Petrov type D spacetimes are shown to be either Bianchi type 1 or to belong to the class of solutions considered by Szekeres (1975) and Szafron (1977). The Allnutt solutions (1982) are shown to be the only purely electric type D fields in which the shear is non-degenerate and in which the acceleration vector lies in the plane spanned by the principal null vectors. The field equations are partially integrated in two classes where no solutions are yet known.
122289003
A class of algebraically general non-null Einstein-Maxwell fields
A class of solutions of the Einstein-Maxwell field equations which satisfy the condition that the null tetrad, determined by the electromagnetic field, is parallelly transported along the curves tangent to the complex null vectors mi and mi is investigated. For the case when mi has zero twist the general solution of the field equations is found in closed form. A symmetry of the Newman-Penrose equations (1963) is used to show the relationship between this class of solutions and those recently studied by Tariq and Tupper (1974, 1975).
121708777
A class of homogeneous Einstein-Maxwell fields
The author considers solutions of the Einstein-Maxwell field equations satisfying the conditions Fij;k+lk=fFij+, Fij;k+nk=gFij+ where Fij+ is the self-dual Maxwell bivector and li and ni are the principal null vectors of Fij+. The fields are algebraically general and the most general solution is found in closed form when li and ni have non-zero twist. Several twist-free solutions are also obtained. Vacuum space-times admitting a test Maxwell field are also considered. In all cases the metric admits a three-parameter group of motions acting transitively on three-dimensional orbits. Fields satisfying the dual conditions with li and ni replaced by mi and mi are also investigated and similar results are obtained.