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19912026
Showing 1997 · hep-exShow all

21 papers · 2 filters

hep-ex1997★ 31 cited

Branching Fractions for D0 -> K+K- and D0 -> pi+pi-, and a Search for CP Violation in D0 Decays

The Fermilab E791 Collaboration, E. M. Aitala

Using the large hadroproduced charm sample collected in experiment E791 at Fermilab, we have measured ratios of branching fractions for the two-body singly-Cabibbo-suppressed charg…

hep-ex1997★ 173 cited

Polarised Quark Distributions in the Nucleon from Semi-Inclusive Spin Asymmetries

Spin Muon Collaboration

We present a measurement of semi-inclusive spin asymmetries for positively and negatively charged hadrons from deep inelastic scattering of polarised muons on polarised protons and…

hep-ex1997★ 24 cited

Updated measurement of the tau lepton lifetime

The ALEPH Collaboration

A new measurement of the mean lifetime of the tau lepton is presented. Three different analysis methods are applied to a sample of 90000 tau pairs, collected in 1993 and 1994 with…

hep-ex1997★ 21 cited

Searches for Supersymmetry in the photon(s) plus missing energy channels at = 161 GeV and 172 GeV

ALEPH Collaboration

Searches for supersymmetric particles in channels with one or more photons and missing energy have been performed with data collected by the ALEPH detector at LEP. The data consist…

hep-ex1997★ 42 cited

Search for the pentaquark via the P^0_{{c bar}s} --> phi,pi,p decay

E791 Collaboration, E. M. Aitala et al

We report results of the first search for the pentaquark P_{{c bar}s} which is predicted to be a doublet of states: P^0_{{c bar}s}=({c bar} s u u d) and P^-_{{c bar}s}=({c bar} s d…

hep-ex1997★ 37 cited

Asymmetries Between the Production of Ds- and Ds+ Mesons from 500 GeV/c pi- Nucleon Interactions as Functions of x_F and square of p_t

E791 Collaboration

This paper presents measurements of the production of Ds- mesons relative to Ds+ mesons as functions of x_F and square of p_t for a sample of 2445 Ds decays to phi pi. The Ds meson…

hep-ex1997★ 29 cited

Observation of Isolated High-ET Photons in Photoproduction at HERA

ZEUS Collaboration

Events containing an isolated prompt photon with high transverse energy, together with a balancing jet, have been observed for the first time in photoproduction at HERA.The data we…

hep-ex1997★ 56 cited

A Measurement of Rb using a Vertex Mass Tag

SLD Collaboration

We report a new measurement of Rb = Gamma(Z0->b-bbar) / Gamma(Z0->hadrons) using a double tag technique, where the b hemisphere selection is based on the reconstructed mass of the…

hep-ex1997★ 23 cited

Searches for Scalar Top and Scalar Bottom Quarks at LEP2

The ALEPH Collaboration

Searches for scalar top and bottom quarks have been performed with data collected by the ALEPH detector at LEP. The data sample consists of 21.7 pb^-1 taken at sqrt{s} = 161, 170,…

hep-ex1997★ 137 cited

Measurement of the Proton Structure Function F_2 and σ_{tot}^{γ^* p} at Low Q^2 and Very Low x at HERA

ZEUS Collaboration

A small electromagnetic sampling calorimeter, installed in the ZEUS experiment in 1995, significantly enhanced the acceptance for very low x and low Q^2 inelastic neutral current s…

hep-ex1997★ 9 cited

Measurement of the B Hadron Energy Distribution in Z0 Decays

K. Abe et al, :, The SLD Collaboration

We have measured the B hadron energy distribution in Z0 decays using a sample of semi-leptonic B decays recorded in the SLD experiment at SLAC. The energy of each tagged B hadron w…

hep-ex1997★ 6 cited

The doubly Cabibbo-suppressed decay

The Fermilab E791 Collaboration

We report the observation of the doubly Cabibbo-suppressed decay in data from Fermilab charm hadroproduction experiment E791. With a signal of 59 \pm 13 events…

hep-ex1997★ 35 cited

Search for pair-production of long-lived heavy charged particles in e+e- annihilation

ALEPH Collaboration

A search for pair-production of long-lived, heavy, singly-charged particles has been performed with data collected by the ALEPH detector at a centre-of-mass energy of 172 GeV. Data…

hep-ex1997★ 108 cited

D* Production in Deep Inelastic Scattering at HERA

ZEUS Collaboration

This paper presents measurements of D^{*\pm} production in deep inelastic scattering from collisions between 27.5 GeV positrons and 820 GeV protons. The data have been taken with t…

hep-ex1997★ 11 cited

Search for sleptons in e+e- collisions at centre-of-mass energies of 161 GeV and 172 GeV

ALEPH collaboration

The data recorded by the ALEPH experiment at LEP at centre-of-mass energies of 161 GeV and 172 GeV were analysed to search for sleptons, the supersymmetric partners of leptons. No…

hep-ex1997★ 20 cited

First Measurement of Leptonic Coupling Asymmetries with Polarized Z bosons

The SLD Collaboration, K. Abe, T. Akagi

We present direct measurements of the -lepton coupling asymmetry parameters, , , and , based on a data sample of 12,063 leptonic decays collected by the S…

hep-ex1997★ 20 cited

Differential Cross Sections of D*+- Photoproduction in ep Collisions at HERA

ZEUS Collaboration

Inclusive photoproduction of D*+- in ep collisions at HERA has been measured with the ZEUS detector for photon-proton centre of mass energies in the range 115 < W < 280 GeV and pho…

hep-ex1997★ 79 cited

Bremsstrahlung Suppression due to the LPM and Dielectric Effects in a Variety of Materials

P. L. Anthony, R. Becker-Szendy, P. E. Bosted +10

The cross section for bremsstrahlung from highly relativistic particles is suppressed due to interference caused by multiple scattering in dense media, and due to photon interactio…

hep-ex1997★ 14 cited

Measurement of Leading Particle Effects in Decays of Z0 Bosons into Light Flavors

The SLD Collaboration, K. Abe et al

We present evidence for leading particle production in hadronic decays of the Z0 boson to light-flavor jets. A polarized electron beam was used to tag quark and antiquark jets, and…

hep-ex1997★ 272 cited

Spin Structure of the Proton from Polarized Inclusive Deep-Inelastic Muon-Proton Scattering

D. Adams

We have measured the spin-dependent structure function in inclusive deep-inelastic scattering of polarized muons off polarized protons, in the kinematic range $0.003 < x <…

hep-ex1997★ 17 cited

Measurement of the Tau Neutrino Helicity and the Michel Parameters in Polarized e+e- Collisions

SLD Collaboration, K. Abe etal

We present a new measurement of the tau neutrino helicity, hnu and the tau Michel parameters rho, eta, xi and the product delta xi. The analysis exploits the highly polarized SLC e…