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Helmut Vogel
Professor
Ph.D., University of Erlangen-Nuremberg, Germany
Email: helmut.vogel@cmu.edu
Phone: (412) 268-2757
FAX: (412) 681-0648
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Current field of research is experimental particle physics, in particular
high-energy colliding beams experiments.
- 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.
- 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.
- 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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