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At Carnegie Mellon



Helmut Vogel
Professor
Ph.D., University of Erlangen-Nuremberg, Germany

Email: helmut.vogel@cmu.edu
Phone: (412) 268-2757
FAX: (412) 681-0648

Current field of research is experimental particle physics, in particular high-energy colliding beams experiments.

  1. Experiment "L3" at the electron-positron storage ring accelerator, LEP (CERN, Geneva, Switzerland):  Study of production and decay of the intermediate bosons W and Z. The properties of these particles provide key insights into the nature of the unified electro-weak interaction of quarks and leptons and allow precision tests of the "Standard Model" theory of electroweak unification. In parallel, the data accumulated by LEP is used to set stringent limits on the mass of the elusive Higgs and supersymmetric particles. LEP has reached a center-of-mass energy of 209 GeV, the highest ever achieved in electron-positron collisions.
  2.  Experiment "CLEO" at the Cornell electron-positron storage ring accelerator, CESR (Ithaca, NY): Study of b quark properties in B mesons and in the Upsilon (b bbar) resonances. CESR operates at center-of-mass energies of 9-11 GeV.
  3. Experiment "CMS" at the Large Hadron Collider (LHC), a 14 TeV proton-proton colliding beam accelerator currently under construction at CERN. Our group is involved in the forward muon system, specifically the front-end electronics for the anode wires of the forward muon cathode-strip chambers.

Selected Publications

P. Rubin et al. (CLEO Collaboration), “Search for Invisible Decays of the Υ(1S) Resonance”, Physical Review D 75, 031104 (2007) hep-ex/0612051

C. Cawlfield et al. (CLEO Collaboration), “Experimental Study of Χb(2P)→ππΧb(1P), Physical Review D 73, 012003 (2006) hep-ex/0511019

J. L. Rosner et al. (CLEO Collaboration), “Observation of the hc(1P1) State of Charmonium” Physical Review Letters 95, 102003 (2005) hep-ex/0505073

M. Artuso et al. (CLEO Collaboration), “Photon Transitions in Υ(2S) and Υ(3S) Decays”, Physical Review Letters 94, 032001 (2005) hep-ex/0411068

R.A. Briere et al. (CLEO Collaboration), “New Measurements of Υ(1S) Decays to Charmonium Final States”, Physical Review D 70, 072001 (2004) hep-ex/0407030

G. Bonvicini et al. (CLEO Collaboration), “First Observation of a Υ(1D) State”, Physical Review D 70, 032001 (2004) hep-ex/0404021

P. Achard et al. (L3 Collaboration), “Analysis of the π+π-π+π- and π+π0π-π0 Final States in Quasi-Real 2-Photon Collisions at LEP”, Physics Letters B 638, 128 (2006)

The ALEPH, DELPHI, L3, OPAL, SLD Collaborations, the LEP Electroweak Working Group, the SLD Electroweak and Heavy Flavour Group, “Precision Electroweak Measurements on the Z Resonance”, Physics Reports 427, 257 (2006)

L3 Collab., P. Achard et al. (L3 Collaboration), “Search for the Standard Model Higgs Boson at LEP”, Physics Letters B 565, 61 (2003)

L3 Collaboration, M. Acciarri et al., "Search for Neutral Higgs Bosons of the Minimal Supersymmetric Standard Model in e+e- Interactions at s = 192-202 GeV". Phys. Lett. B 503, 21 (2001).

L3 Collaboration, M. Acciarri et al., "Measurement of the Charm Production Cross section in gg Collision at LEP". Phys. Lett. B 514, 19 (2001).

CLEO Collaboration, R.A. Briere et al., "Observation of B -> FK and B -> FK*". Phys. Rev. Lett. 86, 3718 (2001).

L3 Collaboration -- M. Acciarri et al., "Search for the Standard Model Higgs boson in e+e- Collisions at s  up to 202 GeV," CERN-EP/2000-146; 24 November 2000, submitted to Physics Letters B.

L3 Collaboration -- M. Acciarri et al., "Study of Z Boson Pair Production in e+e- Interactions at s  = 192-202 GeV," CERN-EP/2000-120; 11 September 2000, Physics Letters B accepted

L3 Collaboration -- M. Acciarri et al., "Measurement of Bose-Einstein Correlations in e+e- -> W+W- at s ~189 GeV," Phys. Lett. B 493, 233 (2000).

L3 Collaboration -- M. Acciarri et al., "Measurements of the b(b-bar) production cross section and forward-backward asymmetry at centre-of-mass energies above the Z pole at LEP," Phys. Lett. B 485, 71 (2000).

L3 Collaboration -- M. Acciarri et al., "Measurement of the Probability of Gluon Splitting into Charmed Quarks in Hadronic Z Decays," Phys. Lett. B 476, 243 (2000).

L3 Collaboration -- M. Acciarri et al., "Measurement of Mass and Width of the W Boson at LEP," Phys. Lett. B 454, 386 (1999).

L3 Collaboration -- M. Acciarri et al., "Measurement of the B0(B0-bar) Oscillation Frequency," European Physical Journal C 5, 195 (1998).

Ian Brock et al., "Luminosity Measurement in the L3 Detector at LEP," Nuclear Instruments and Methods A381, 236 (1996).

L3 Collaboration -- M. Acciarri et al., "A measurement of tau polarization at LEP," Phys. Lett. B 341, 245 (1994).

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