15188676
Calibration and performance of the MARK II drift chamber vertex detector
We have calibrated and studied the performance of the MARK II drift chamber vertex detector with cosmic ray tracks collected with the chamber inside the MARK II detector at the SLC. The chamber achieves 30 {mu}m impact parameter resolution and 500 {mu}m track-pair resolution using CO{sub 2}/C{sub 2}H{sub 6}H{sub 6}(92/8) at 2 atmospheres pressure. The chamber has successfully recorded Z{sup 0} decays at the SLC, and resolved tracks in dense hadronic jets with good efficiency and high accuracy. 5 refs., 13 figs.
124046826
CHARMLESS HADRONIC B DECAYS WITH THE FULL CLEO DATA SAMPLE
118236755
Recent Results in Charmless Hadronic B Decays from BABAR
We report results from five analyses based on data taken with the BABAR detector at the PEP-II asymmetric e{sup +}e{sup -} collider. Included are branching fraction measurements for many B-meson decays involving {eta}, {eta}{prime}, {omega}, {phi} or a{sub 0} mesons and the final state K{sub s}{sup 0}{pi}{sup +}{pi}{sup -}, and a full angular analysis of the decay B{sup 0} {yields} {phi}K*{sup 0}.
120135663
Studies of tau decay modes with K0 mesons from CLEO
We examine five final states involving K 0 mesons, presenting branching fractions for the decays τ → K 0 πν τ , τ → K 0 ππ 0 ν τ , τ → K 0 Kν τ , τ → K 0 Kπ 0 ν τ , and τ → K s K s hν τ . The mass spectra provide evidence for the dominant role of K * in Kπ decays and K 1 in Kππ modes. We find evidence for a significant K * K contribution to the KKπ decays.
120150178
Measurement of anomalous muon pair production in electron-positron annihilations
We have observed 16 events of the type ..mu../sup +/..mu../sup -/ + (missing energy and momentum) from e/sup +/e/sup -/ annihilations at center-of-mass energies between 6.4 and 7.4 GeV. Taking into account QED backgrounds, we find an excess of 11 anomalous dimuon events. If these are attributed to the production and subsequent decay of a pair of heavy leptons L/sup + -/, we obtain the muonic braching ratio B ((L/sup +/ ..-->.. ..mu../sup +/..nu../sub ..mu../nu-bar/sub L/)/ (L/sup +/ ..-->.. all)) = 0.22/sup +0.07//sub -0.08/.
115309491
Experimental results for charmless hadronic B decays
122252524
Corrections to the Goldberger-Treiman Relation in a Unified Gauge-Field Model
The corrections to the Goldberger-Treiman relation are examined in a unified gauge-field model. The strong interactions are governed by the local chiral SU(2) x SU(2) gauge group, whereas the weak and electromagnetic interactions are based on SU(2) x U(1) gauge invariance. We find that the Goldberger-Treiman formula is a zeroth-order relation, so that its corrections are finite. We estimate the corrections in the case that the pion is a pseudo-Goldstone boson. The result, of which the gauge independence is explicitly verified, is proportional to the weak and electromagnetic coupling constants.
119473292
J/Psi and Psi' Polarizations in Polarized Proton-Proton Collisions at the RHIC
We study inclusive heavy quarkonium production with definite polarizations in polarized proton-proton collisions using the non-relativistic QCD color-octet mechanism. We present results for rapidity distributions of cross sections and spin asymmetries for the production of J/psi and psi' with specific polarizations in polarized p-p collisions at \sqrt s = 200 GeV and 500 GeV at the RHIC within the PHENIX detector acceptance range.
15997805
Next-to-leading order QCD corrections to differential distributions of Higgs boson production in hadron-hadron collisions
We present the full next-to-leading order corrected differential distributions d 2 σ/dpT /dy, dσ/dpT and dσ/dy for the semi-inclusive process p + p → H + ′ X ′ . Here X denotes the inclusive hadronic state and pT and y are the transverse momentum and rapidity of the Higgs-boson H respectively. All QCD partonic subprocesses have been included. The computation is carried out in the limit that the top-quark mass mt → ∞ which is a very good approximation as long as mH, pT < 200 GeV. Our calculations reveal √
118872013
NNLO corrections to the total cross section for Higgs boson production in hadron–hadron collisions
Abstract We present the next-to-next-to-leading order (NNLO) corrections to the total cross section for (pseudo-) scalar Higgs boson production using an alternative method than those used in previous calculations. All QCD partonic subprocesses have been included and the computation is carried out in the effective Lagrangian approach which emerges from the standard model by taking the limit m t →∞ where m t denotes the mass of the top quark. Our results agree with those published earlier in the literature. We estimate the theoretical uncertainties by comparing the K -factors and the variation with respect to the mass factorization/renormalization scales with the results obtained by lower order calculations. We also investigate the dependence of the cross section on several parton density sets provided by different groups.
120612585
Chiral solitons in nuclei: Saturation, EMC effect, and Drell-Yan experiments
The chiral quark-soliton model of the nucleon contains a mechanism for an attractive interaction between nucleons. This, along with the exchange of vector mesons between nucleons, is used to compute the saturation properties of infinite nuclear matter. This provides a new way to assess the effects of the nuclear medium on a nucleon that includes valence and sea quarks. We show that the model simultaneously describes the nuclear EMC effect and the related Drell-Yan experiments.