46325047
Helicity decomposition for inclusive J/ psi production.
We present a general method for calculating inclusive cross sections for the production of heavy quarkonium states with definite polarization within the NRQCD factorization approach. Cross sections for polarized production can involve additional matrix elements that do not contribute to cross sections for unpolarized production. They can also include interference terms between parton processes that produce {ital Q{bar Q}} pairs with different total angular momentum. The interference terms cancel upon summing over polarizations. Our method can be generalized to {ital N} dimensions and is, therefore, compatible with the use of dimensional regularization to calculate radiative corrections. We illustrate the method by applying it to the production of {ital J}/{psi} via the parton processes {ital q{bar q}}{r_arrow}{ital c{bar c}} and {ital gg}{r_arrow}{ital c{bar c}}. {copyright} {ital 1996 The American Physical Society.}
9063079
The Physics of the B Factories
This work is on the Physics of the B Factories. Part A of this book contains a brief description of the SLAC and KEK B Factories as well as their detectors, BaBar and Belle, and data taking related issues. Part B discusses tools and methods used by the experiments in order to obtain results. The results themselves can be found in Part C.
120782930
On the reparameterization invariance in heavy quark effective theory
Abstract The reparameterization invariance in Heavy Quark Effective Theory is reconsidered. Starting from an effective Lagrangian derived from QCD full theory, a consistent transformation law for the heavy quark effective field under the variation of the parameter v is obtained and the reparameterization invariance in the effective Lagrangian is shown.
119107781
QCD corrections to single slepton production at hadron colliders
We evaluate the cross section for single slepton production at hadron colliders in supersymmetric theories with R-parity violating interactions to the next-to-leading order in QCD. We obtain fully differential cross section by using the phase space slicing lethod. We also perform soft-gluon resummation to all order in alpha(s) of leading logarithm to obtain a complete transverse momentum spectrum of the slepton. We find that the full transverse momentum spectrum is peaked at a few GeV, consistent with the early results for Drell-Yan production of lepton pairs. We also consider the contribution from gluon fusion via quark-triangle loop diagrams dominated by the b-quark loop. The cross section of this process is significantly smaller than that of the tree-level process induced by the initial b (b) over bar annihilation.
120909739
Relativistic corrections to heavy quark fragmentation to S-wave heavy mesons
The relativistic corrections of order v{sup 2} to the fragmentation functions for the heavy quark to S-wave heavy quarkonia are calculated in the framework of the nonrelativistic quantum chromodynamics factorization formula. We derive the fragmentation functions by using the Collins-Soper definition in both the Feynman gauge and the axial gauge. We also extract them through the process Z{sup 0}{yields}Hqq in the limit M{sub Z}/m{yields}{infinity}. We find that all results obtained by these two different methods and in different gauges are the same. We estimate the relative size of the relativistic corrections to the fragmentation functions.
124674675
EXPERIMENTAL STUDY OF J/PSI RADIATIVE DECAY TO PI 0PI 0
44727684
BRST quantization of topological field theory.
The canonical quantization of the topological field-theory model {Sigma}, proposed by Horowitz, is examined through the Becchi-Rouet-Stora-Tyutin approach. With this approach we have a manifestly covariant description of a certain class of topological quantum field theories. However, if {ital M} in the present model is any orientable four-dimensional manifold, one would end up with different theories when different polarizations are chosen. Therefore a restriction {ital M}={ital R}{sup 1}{times}{Sigma}, as pointed out by Horowitz, is required for consistency.
16855657
Critical statistical charge for anyonic superconductivity.
We examine a criterion for the anyonic superconductivity at zero temperature in Abelian matter-coupled Chern-Simons gauge-field theories in three dimensions. By solving the Dyson-Schwinger equations, we obtain a critical value of the statistical charge for the superconducting phase in a massless fermion-Chern-Simons model. {copyright} {ital 1996 The American Physical Society.}
43259824
Scale and conformal invariance in Chern-Simons-matter field theory.
We study perturbative renormalization of D=3 Chern-Simons gauge theory coupled to scalar and fermionic matter. We show that in the non-Abelian case the coefficient of the Chern-Simons term has infinite renormalization and that both the matter and the non-Abelian gauge fields acquire nonvanishing anomalous dimensions at the two-loop level. However, the two-loop β function of the gauge coupling always vanishes, indicating that scale and conformal invariance survive quantization and infinite renormalization
43134745
Free heterotic string field theory.
A gauge-fixed action is constructed for the free heterotic string based on the bosonic string and the Neveu-Schwarz-Ramond (NSR) superstring by the Becchi-Rouet-Stora-Tyutin approach. The field theory gives a balance condition; it replaces the Gliozzi-Scherk-Olive projector in the NS sector to eliminate the tachyons and to ensure that the states have the correct spin statistics. At the massless level we get a ten-dimensional linearized supergravity, a ten-dimensional linearized super-Yang-Mills field with the gauge group E/sub 8/ x E/sub 8/ or Spin(32)/Z/sub 2/, a dilaton, an interesting dilatonlike Majorana-Weyl spinor, and so on.
40500552
Measurement of the bottom-quark production cross section in 800 GeV/c proton-gold collisions.
Using a silicon-microstrip detector array to identify secondary vertices, we have observed {ital b}{r_arrow}{ital J}/{psi}{r_arrow}{mu}{sup +}{mu}{sup {minus}} decays in 800 GeV/{ital c} proton-gold interactions. The doubly differential cross section for {ital J}/{psi} mesons originating from {ital b}-quark decays, assuming linear dependence on nucleon number, is {ital d}{sup 2}{sigma}/{ital dx}{sub {ital Fdp}}{sup 2}{sub {ital T}}=107{plus_minus}28{plus_minus}19/nucleon at {ital x}{sub {ital F}}=0.05 and {ital p}{sub {ital T}}=1GeV/{ital c}. This measurement is compared to next-to-leading-order QCD predictions. The integrated {ital b}-quark production cross section, obtained by extrapolation over all {ital x}{sub {ital F}} and {ital p}{sub {ital T}}, is {sigma}({ital pN}{r_arrow}{ital bb}{ovr bar}+{ital X})=5.7{plus_minus}1.5{plus_minus}1.3 nb/nucleon.