The ATLAS Experiment

ATLAS is a multi-purpose detector at the Large Hadron Collider at the CERN Laboratory in Geneva, Switzerland. The collaboration involves approximately 3000 physicists from 175 institutions and 38 countries. ATLAS collects data from proton - proton collisions at a center-of-mass energy of 8 TeV (in 2012) occuring 40 million times a second.

The detector was designed to search for several different kinds of new physics that might appear at the TeV energy range, such as the newly-discovered boson at a mass of ~126 GeV that is consistent with the Standard Model Higgs particle. The energy range of the LHC is sufficient to allow tests of many "Beyond the Standard Model" theories such as supersymmetry, and as of 2012 as already placed stringent limits on the parameter space of supersymmetric theories. Our NYU group was officially admitted to the ATLAS collaboration in 2006 and has been active ever since. More information about ATLAS and our NYU group's ATLAS activities can be found here.

APEX: A Prime EXperiment

APEX is an experiment at Jefferson Lab that searches for new vector bosons (A') with weak coupling to electrons and with masses < 1 GeV.


From 1997 until it was terminated in August of 2005, we were collaborators on the MECO (Muon Electron COnversion) experiment, designed to search for muon number violation at the Brookhaven National Laboratory (BNL: http://www.bnl.gov ) Alternating Gradient Synchrotron (AGS). With a sensitivity below 10-16, four orders of magnitude lower than that of existing measurements, MECO would have been sensitive to rates predicted for such processes by a large class of supersymmetric theories.


From 1987 to 1998 the NYU group was a member of the DØ collaboration ( http://www-d0.fnal.gov ). Using the Tevatron accelerator at FNAL (the Fermi National Accelerator Laboratory: http://www.fnal.gov ), the D-Zero experiment studies proton anti-proton interactions at the highest energy currently available at terrestial accelerators. Measurements included precise testing of the "Standard Model" of interactions of quarks and leptons (by comparison of its predictions with the measured W meson and top quark masses), comparison with theoretical predictions of strong interaction behavior ( quantum chromo-dynamics ) and search for new particles such as those predicted by supersymmetry.


The NYU group has also been active in the study of particles not coming from Earth-based accelerators but originating instead in astronomical sources. MILAGRO (Multiple Institution Los Alamos Gamma Ray Observatory) was a high energy gamma ray astrophysics experiment in the Jemez Mountains near Los Alamos, New Mexico ( http://www.lanl.gov ). It was the first detector designed to allow continuous detection from the full over-head sky of photons with energy of about 100 GeV to 100 TeV (VHE gamma rays). Among the studies which were out with MILAGRO were a VHE gamma ray survey of the northern sky, during which we discovered several new TeV sources, monitoring of known VHE gamma ray sources, study of gamma ray bursts, and studies of the solar magnetic field and solar flares. Our NYU group started working on Milagro in 1990. The experiment ceased operation in April of 2008, when the final shift was performed by NYU graduate student Grant Christopher. Some analysis of MILAGRO data is still underway.

Some Representative Publications:


"Combined search for the Standard Model Higgs boson in pp collisions at √s=7  TeV with the ATLAS detector", Phys. Rev. D 86, 032003 (2012)

"Statistical combination of top quark pair production cross-section measurements using dilepton, single-lepton, and all-hadronic final states at √s = 7 TeV with the ATLAS detector.", ATLAS-CONF-2012-024 (2012)

"Prospects for measuring top pair production in the dilepton channel with early ATLAS data at sqrt(s)=10 TeV", ATL-PHYS-PUB-2009-086. (2009)

"Search for the standard model Higgs boson via vector boson fusion production process in the di-tau channels." ATL-PHYS-PUB-2009-055 (2009)

"The ATLAS Experiment at the CERN Large Hadron Collider." JINST 3 (2008)

"Expected Performance of the ATLAS Experiment - Detector, Trigger and Physics" CERN-OPEN-2008-020, [arxiv:0901.0512]

"Prospects for the Search for a Standard Model Higgs Boson in ATLAS Using Vector Boson Fusion," Eur. Phys. J. C32S2, 19 (2004)


"Search for a New Gauge Boson in Electron-Nucleus Fixed-Target Scattering by the APEX Experiment.", Phys.Rev.Lett. 107 (2011) 191804


"Milagro Observations of Multi-TeV Emission from Galactic Sources in the Fermi Bright Source List" Ap.J. Lett. 700, L127 (2009)

"TeV Gamma-Ray Sources from a Survey of the Galactic Plane with Milagro", With the Milagro Collaboration, Ap. J. Lett. 664, L91 (2007)

"Evidence for TeV Gamma-Ray Emission from a Region of the Galactic Plane", With the Milagro Collaboration, Phys. Rev. Lett. 95, 251103 (2005)

"Search for Very High Energy Gamma-Rays from WIMP Annihilation near the Sun with the Milagro Detector", With the Milagro Collaboration, Phys. Rev. D70, 083516 (2004)


"Search for neutral Higgs bosons decaying into four taus at LEP2", JHEP 1005 (2010) 049


"Muon Conversion Experiments - Current and Future," For the MECO Collaboration, Intersections of Particle and Nuclear Physics - 7th Conference CIPANP2000 AIP Conf. Proc. 549 (p. 942).

"Muon to Electron Conversion Status and Prospects", Proceedings of the Workshop on Physics at the First Muon Collider, AIP Conf. Proc. 435, Nov. 1997


"Measurement of the W Boson Mass", With the DØ Collaboration, Phys. Rev. Lett. 77, 3309 (1996)

"Observation of the Top Quark", With the DØ collaboration, Phys. Rev. Lett. 74, 2632 (1995)

"The DØ Detector", With the DØ Collaboration, Nucl. Instr. Meth. A338, 185 (1994)

Detector Development

"Lead-Tungstate Scintillator Studies for a Fast Low-Energy Calorimeter" JINST 5 P01003 (2010).

"Charge Production in Thin Gap Multi-Wire Chambers", Nucl. Instr. Meth. A439, 147 (2000)

"Calculation of Pad Cross Talk in a Thin-Gap Multiwire Detector with Pad Readout", Nucl. Instr. Meth. A404, 41 (1998)

"TPC Tracking Inside a Cerenkov Detector", Nucl. Instr. Meth. A283, 578 (1989)