0000000000106053

AUTHOR

A. Rozas

showing 3 related works from this author

Search for composite and exotic fermions at LEP 2

1999

A search for unstable heavy fermions with the DELPHI detector at LEP is reported. Sequential and non-canonical leptons, as well as excited leptons and quarks, are considered. The data analysed correspond to an integrated luminosity of about 48~pb$^{-1}$ at an $e^+e^-$ centre-of-mass energy of 183~GeV and about 20~pb$^{-1}$ equally shared between the centre-of-mass energies of 172~GeV and 161~GeV. The search for pair-produced new leptons establishes 95\% confidence level mass limits in the region between 70~GeV/$c^2$ and 90~GeV/$c^2$, depending on the channel. The search for singly produced excited leptons and quarks establishes upper limits on the ratio of the coupling of the excited fermio…

QuarkParticle physicsPhysics and Astronomy (miscellaneous)PAIR PRODUCTIONCHARGED HEAVY-LEPTONSFOS: Physical sciences7. Clean energy01 natural sciencesPartícules (Física nuclear)CROSS-SECTIONSHigh Energy Physics - ExperimentE(+)E(-) COLLISIONSBHABHA SCATTERINGHigh Energy Physics - Experiment (hep-ex)0103 physical sciencesMONTE-CARLO PROGRAM[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]RADIATIVE-CORRECTIONS010306 general physicsNuclear ExperimentEngineering (miscellaneous)PhysicsLuminosity (scattering theory)010308 nuclear & particles physicsHigh Energy Physics::PhenomenologyFermionCoupling (probability)Z0 DECAYSExcited stateHigh Energy Physics::ExperimentFísica nuclearROOT-S=161 GEVEXCITED LEPTONSCHARGED HEAVY-LEPTONS; MONTE-CARLO PROGRAM; EXCITED LEPTONS; E(+)E(-) COLLISIONS; Z0 DECAYS; ROOT-S=161 GEV; RADIATIVE-CORRECTIONS; BHABHA SCATTERING; PAIR PRODUCTION; CROSS-SECTIONSParticle Physics - ExperimentLepton
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A search for $\eta'_c$ production in photon-photon fusion at LEP

1998

A search for the production of the $\eta'_c$ meson, the first radial excitation of the ground state of charmonium $\eta_c$(2980), in the photon-photon fusion reaction at LEP has been performed using the data collected by the DELPHI detector during 1992-1996. No evidence of $\eta'_c$ production is found in the mass region 3520--3800 MeV/c^2. An upper limit for the ratio of the two-photon widths of the $\eta'_c$ and $\eta_c$ is obtained.

Nuclear and High Energy PhysicsParticle physicsPhotonMesonHigh Energy Physics::LatticeWidth ratio01 natural sciencesPartícules (Física nuclear)High Energy Physics - ExperimentNuclear physics0103 physical sciences[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]Nuclear fusion010306 general physicsNuclear ExperimentDELPHIPhysicsFusion010308 nuclear & particles physicsHigh Energy Physics::PhenomenologyLARGE ELECTRON POSITRON COLLIDERLarge Electron–Positron ColliderPARTICLE PHYSICS; LARGE ELECTRON POSITRON COLLIDER; DELPHIPARTICLE PHYSICSFísica nuclearHigh Energy Physics::ExperimentGround stateExcitationParticle Physics - Experiment
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Measurement of inclusive K*(0)(892), phi(1020) and K-2*(0)(1430) production in hadronic Z decays

1996

The inclusive production of the neutral vector mesons K-*0(892) and phi(1020), and of the tensor meson K-2(*0)(1430), in hadronic decays of the Z has been mea sured by the DELPHI detector at LEP. The average production rates per hadronic Z decay have been determined to be 0.77 +/- 0.08 K-2(*0)(892), 0.104 +/- 0.008 phi(1020) and 0.079 +/- 0.040 K-2(*0)(1430). The ratio of the tensor-to-vector meson production yields, [K-2(*0)(1430)]/[K-*0(892)] = 0.10 +/- 0.05, is smaller than the [f(2)(1270)]/[rho(0)(770)] and [f'(2)(1525)]/[phi(1020)] ratios measured by DELPHI. The production rates and differential cross sections are compared with the predictions of JETSET 7.4 tuned to the DELPHI data and…

Particle physicsMeson productionPhysics and Astronomy (miscellaneous)MesonElectron–positron annihilationHadronVECTORproduction rate01 natural sciencesPartícules (Física nuclear)DELPHI; neutral vector meson; tensor meson; production rateNuclear physics0103 physical sciences[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]MESON; VECTOR; GEV/Cneutral vector mesonTensorNeutral vector010306 general physicsDetectors de radiacióDELPHIPhysics010308 nuclear & particles physicstensor mesonGEV/CMass spectrumProduction (computer science)MESON
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