120783806
Limiting Distribution and the Average pi+/- Multiplicities in pi-+p-->pi+/-+ Anything Reactions
120651340
Astrophysical relevance of "Quantum electrodynamics in a photon sea"
The shift in the hydrogen ground-state energy level as a result of background photon corrections is worked out explicitly. This is then used in the discussion of possible astrophysical significance, in particular for normal, stable stellar configurations, where we show that the shift would be masked by ''classical'' line broadening.
122081005
Vanishing of the second-order correction to the triangle anomaly in Landau-gauge, zero-fermion-mass quantum electrodynamics
120094375
High-energy behavior of fermion-fermion scattering in a supersymmetric field theory
The high-energy behavior of the fermion-fermion and fermion-antifermion scattering amplitudes of a class of field theories, containing a spin-\textonehalf{} fermion field, a scalar field, and a pseudoscalar field, are investigated. These theories consist of a supersymmetric model, the Yukawa model, and the linear $\ensuremath{\sigma}$ model. In the leading-logarithm approximation, ladders with fermions running along the sides in the $t$ channel and mesons as rungs dominate in each order of two classes of diagrams. The sums of the dominant series give rise to fixed Regge cuts for all the three theories; the amplitude of the supersymmetric theory possesses a definite signature, while those of the other two lack it. A comparison of the result of the supersymmetric theory with the results of an asymptotically free theory and the spontaneously broken non-Abelian gauge theory is made.
122023172
STUDY OF THE HYPOTHESIS OF THRESHOLD DOMINANCE IN A RENORMALIZED LINEAR sigma MODEL.
We examine Li and Pagels's hypothesis of threshold dominance (h.t.d.) in a linear SU(2) \ifmmode\times\else\texttimes\fi{} SU(2) $\ensuremath{\sigma}$ model renormalized up to one loop. The exact inverse two-point functions ($\ensuremath{\sigma}$ and $\ensuremath{\pi}$ inverse propagators) at zero momentum transfer are calculated. These values are compared with that obtained by following the h.t.d. procedure. The threshold-dominance values show a sensitive dependence on the "cutoff," and the error ranges from 8% to 43%.
119412414
PHENOMENOLOGICAL STUDY OF SINGLE-PARTICLE DISTRIBUTIONS NEAR THE KINEMATICAL LIMITS.
36246516
A CO (J = 3-2) Outflow Survey of the Elias 29 Region
We present a 5' × 5' integrated intensity map of 12CO (J = 3-2) emission from the ρ Ophiuchi cloud core that traces low-luminosity outflow emission from two protostars: Elias 29 and, most likely, LFAM 26. The morphology of the outflow from Elias 29 is bipolar and has a curved axis that traces the S-shaped symmetry seen in H2 emission. The outflow from LFAM 26 is a new detection and oriented in the east-west direction near the plane of the sky with most of the blueshifted emission being absorbed by intervening clouds. The outflow axis of this object also appears to intersect a knot of H2 emission previously attributed to Elias 29. LFAM 26 is a low-luminosity source (Lbol = 0.06 L☉), which, in combination with the observed outflow, makes it a candidate very low luminosity object (VeLLO). We derive lower limits to the gas column densities and energetics for both outflows. The mechanical luminosities for Elias 29 and LFAM 26 are 6.4 and 10.3 × 10-3 L☉, respectively.
121449664
DIVERGENT VERTICES AND ANOMALOUS DIMENSIONS.
117644748
Multi-channel dynamics for the Y1*(1660) resonant state
SummaryThe channels BP, Y0*(1405)P and BV are included in a dispersion calculation, in a simplified pole approximation, for the 3/2− baryon resonances. The Y1*(1660) is found to be consistent with the γ-octet assignment with a calculated total width of 46 MeV.RiassuntoSi includono i canali BP, Y0*(1405) P e BV in un calcolo di dispersione, in una approssimazione semplificata dei poli, per le risonanze barioniche 3/2−. Si trova che Y1*(1660) corrisponde all'assegnazione all'ottetto γ con un'ampiezza totale calcolata di 46 MeV.РезюмеКаналы BP, Y0*(1405)P и BV вклучаются в дисперсионное вычисление, в упрощенное полюсное приближение, для 3/2− барионных резонансов. Найдено. что Y1*(1660) согласуется с заданием γ-октета с вычисленной полной шириной 46 МэВ.