118297532
A Study of hadronic final states produced in association with high pT jets and high - mass dimuons
56282466
Production of High Transverse Energy Events in p - Nucleus Collisions at 400-GeV/c
High-transverse-energy events produced in pp collisions at 400 GeV/c were studied using the large-acceptance Fermilab multiparticle spectrometer. The cross sections for such interactions exhibit an exponential dependence on transverse energy with values of the slope increasing with the decreasing azimuthal acceptance of the trigger. The majority of events selected with full azimuthal acceptance are nonplanar; hence they do not show jet-like event structure. The fraction of planar events is small and remains constant as a function of transverse energy.
124802336
CYCLOTRON ORBITS: A 709 RAY-TRACE PROGRAM FOR CYLIN-DRICALLY SYMMETRIC MAGNETIC FIELDS
CYCLOTRON ORBITS is a 709 program for tracing secondary beams out of a cylindrically symmetric magnetic field. Development of a 6-by-6 transfer matrix allows one to couple to external quadrupole and bending magnets. (auth)
121567945
An optical model consistency condition between the regeneration phase and the real parts of the KON forward scattering amplitudes
Abstract Using just the magnitude of the regeneration amplitude we show that both the regeneration phase, ϕ r , and the sum of the ratios of the real to imaginary parts of the K O N forward scattering amplitudes, γ pn , can be determined for nuclei with zero or moderate neutron excess. We find: ϕ r = (43.5 ± 2.5) o ; γ pn = −0.73 ± 0.1 + 1.7 γ pn 〈 2.7 GeV /c 〉 = −0.65 ± 0.07 + 1.6 γ pn 〈 4.5 GeV /c 〉 , where γ pn is corresponding quantity for K O N scattering. Applications to regeneration in hydrogen and the ϕ-meson are discussed.
102780453
ELASTICALLY SCATTERED POLARIZATION OF 40-MeV PROTONS FROM DEUTERIUM
119402224
A Lower bound on the local extragalactic magnetic field
Assuming that the hard gamma-ray emission of Cen A is a result of synchrotron radiation of ultra-relativistic electrons, we derive a lower bound on the local extragalactic magnetic field, $B> 10^{-8}$ G. This result is consistent with (and close to) upper bounds on magnetic fields derived from consideration of cosmic microwave background distortions and Faraday rotation measurements.
120024085
Relations among the radiative decay widths of charmonium states from superconvergent sum rules
Relations among the decay widths for ${\ensuremath{\psi}}^{\ensuremath{'}}\ensuremath{\rightarrow}{\ensuremath{\chi}}_{J}\ensuremath{\gamma}$,${\ensuremath{\chi}}_{J}\ensuremath{\rightarrow}\ensuremath{\psi}\ensuremath{\gamma}$ (where ${\ensuremath{\chi}}_{J}$ is one of the $^{3}P$ charmonium states) are derived from two Drell-Hearn-type sum rules. The relations, which make no use of the nonrelativistic $c\overline{c}$ picture of the ${\ensuremath{\psi}}^{\ensuremath{'}}$, $\ensuremath{\chi}$, and $\ensuremath{\psi}$ states, predict${\ensuremath{\gamma}}_{2}^{\ensuremath{'}}:{\ensuremath{\gamma}}_{1}^{\ensuremath{'}}:{\ensuremath{\gamma}}_{0}^{\ensuremath{'}}=1.2:1.3:1.0$, ${\ensuremath{\gamma}}_{2}:{\ensuremath{\gamma}}_{1}:{\ensuremath{\gamma}}_{0}=0.9:0.8:1.0$, where ${\ensuremath{\gamma}}_{J}^{\ensuremath{'}}\ensuremath{\equiv}\frac{\ensuremath{\Gamma}({\ensuremath{\psi}}^{\ensuremath{'}}\ensuremath{\rightarrow}{\ensuremath{\chi}}_{J}\ensuremath{\gamma})}{(2J+1){k}_{J}^{\ensuremath{'}3}}$,${\ensuremath{\gamma}}_{J}\ensuremath{\equiv}\frac{\ensuremath{\Gamma}({\ensuremath{\chi}}_{J}\ensuremath{\rightarrow}\ensuremath{\psi}\ensuremath{\gamma})}{k_{J}^{}{}_{}{}^{3}}$.
117808653
Black hole chromosphere at the CERN LHC
If the scale of quantum gravity is near a TeV, black holes will be copiously produced at the CERN LHC. In this work we study the main properties of the light descendants of these black holes. We show that the emitted partons are closely spaced outside the horizon, and hence they do not fragment into hadrons in vacuum but more likely into a kind of quark-gluon plasma. Consequently, the thermal emission occurs far from the horizon, at a temperature characteristic of the QCD scale. We analyze the energy spectrum of the particles emerging from the ``chromosphere,'' and find that the hard hadronic jets are almost entirely suppressed. They are replaced by an isotropic distribution of soft photons and hadrons, with hundreds of particles in the GeV range. This provides a new distinctive signature for black hole events at LHC.
14853773
Clustering in highest energy cosmic rays: physics or statistics?
Directional clustering can be expected in cosmic ray observations due to purely statistical fluctuations for sources distributed randomly in the sky. We develop an analytic approach to estimate the probability of random cluster configurations, and use these results to study the strong potential of the HiRes, Auger, Telescope Array and EUSO/OWL/AirWatch facilities for deciding whether any observed clustering is most likely due to non-random sources.
119491859
Dynamics at High Spin of the rho-A2 Trajectory