Landsberg, Greg

Greg Landsberg

Thomas J. Watson, Sr. Professor of Physics

Overview

Prof. Landsberg has joined the Brown faculty in 1998, following post-doctoral research at Fermi National Accelerator Laboratory, Batavia, IL. Since then Prof. Landsberg has served as a convener of the D0 Exotics (1997-2000) and New Phenomena (2002-2004) groups, as well as the Deputy Physics Coordinator of the D0 collaboration (2004-2005). Since 2005 his main research focus is the CMS experiment at the CERN LHC. He was a convener of the CMS Exotica physics analysis group in 2009-2010, CMS Physics Coordinator in 2012-2013 (culminating in the discovery of the Higgs boson), and Publication Committee Deputy Chair (2014-2015). He also served as the CMS HCAL Detector Performance Group convener (2014-2015), and a convener of the CMS B Physics group (2018-2020), pursuing exploration of flavor anomalies that currently constitute the most significant experimental deviation from the Standard Model predictions.

Prof. Landsberg is a member of a number of Advisory boards and organizing committees for several international conferences and workshops. He is a Divisional Associate Editor of the Phys. Rev. Lett. journal.

He is also an author of a number of publications on collider phenomenology, including the pioneering work on mini black hole production at the LHC, which is among TOPCITE 1000+ articles.

Brown Affiliations

Physics

Research

Research Overview

Professor Landsberg does research in elementary particle physics, specifically experimental investigation of the fundamental particles and fields at the energy frontier accelerators. His main research activity is the search for new physics phenomena, including extra dimensions in space. He is a member of the CMS experiment operating at Large Hadron Collider at CERN (Geneva, Switzerland) and served as the Physics Coordinator of the CMS experiment at the time of the Higgs boson discovery.

Research Statement

My research interests belong to the field of experimental particle physics at the energy frontier. This field of physics is concerned with the properties of fundamental building blocks of matter and forces binding them together. What are the bricks and mortar of our universe? What governs their properties, such as electric charge and mass? There is a deep connection between the physics of the smallest objects (elementary particles) and the physics of the largest scales (galaxies, clusters of galaxies, the universe itself), which is not quite understood yet. We hope to find the answers to the fundamental questions of our existence: what makes the universe around us; why is it made of matter, with very little antimatter remaining around; what is dark matter and dark energy; what is the origin of mass.

Funded Research

Department Of Energy Grant "Research in Particle Physics, Task C" since 1998, approximately $800K/year

Scholarly Work

Selected publications:

“Observation of the rare B⁰_s→μ+μ− decay from the combined analysis of CMS and LHCb data”, CMS and LHCb Collaborations, to appear in Nature 521 (2015), doi:10.1038/nature14474.
“Combined Measurement of the Higgs Boson Mass in pp Collisions at s=√7 and 8 TeV with the ATLAS and CMS Experiments”, ATLAS and CMS Collaborations, Phys. Rev. Lett. 114 (2015) 191803.
“Precise determination of the mass of the Higgs boson and tests of compatibility of its couplings with the standard model predictions using proton collisions at 7 and 8 TeV”, CMS Collaboration, Eur. Phys. J. C75 (2015) 212, TOPCITE 50+.
“Interplay and Characterization of Dark Matter Searches at Colliders and in Direct Detection Experiments”, S. Malik et al., Phys. Dark Universe 03 (2015) 003.
“Black Holes at the LHC”, G. Landsberg, in Fundam. Theor. Phys. 178 (2014) 267.
“Search for neutral MSSM Higgs bosons decaying to a pair of tau leptons in pp collisions”, CMS Collaboration, JHEP 10 (2014) 160, TOPCITE 50+.
“Search for the associated production of the Higgs boson with a top-quark pair”, CMS Collaboration, JHEP 09 (2014) 087.
“Observation of the diphoton decay of the Higgs boson and measurement of its properties”, CMS Collaboration, Eur. Phys. J. C74 (2014) 3076, TOPCITE 50+.
“Constraints on the Higgs boson width from off-shell production and decay to Z-boson pairs”, CMS Collaboration, Phys. Lett. B736 (2014) 64.
“Search for invisible decays of Higgs bosons in the vector boson fusion and associated ZH production modes”, CMS Collaboration, Eur. Phys. J. C74 (2014) 2980, TOPCITE 50+.
“Evidence for the direct decay of the 125 GeV Higgs boson to fermions”, CMS Collaboration, Nature Phys. 10 (2014) 557, TOPCITE 50+.
“Evidence for the 125 GeV Higgs boson decaying to a pair of τ leptons”, CMS Collaboration, JHEP 05 (2014) 104, TOPCITE 100+.
“Measurement of the properties of a Higgs boson in the four-lepton final state”, CMS Collaboration, Phys. Rev. D89 (2014) 092007, TOPCITE 100+.
“Measurement of Higgs boson production and properties in the WW decay channel with leptonic final states”, CMS Collaboration, JHEP 01 (2014) 096, TOPCITE 100+.
“Search for the standard model Higgs boson produced in association with a W or a Z boson and decaying to bottom quarks”, CMS Collaboration, Phys. Rev. D89 (2014) 012003, TOPCITE 100+.
“Measurement of the B⁰_s→μ⁺μ⁻ branching fraction and search for B⁰→μ⁺μ⁻ with the CMS experiment”, CMS Collaboration, Phys. Rev. Lett. 111 (2013) 101804, TOPCITE 100+.
“Observation of a new boson with mass near 125 GeV in pp collisions at s√ = 7 and 8 TeV”, CMS Collaboration, JHEP 06 (2013) 081, TOPCITE 1000+.
“Study of the Mass and Spin-Parity of the Higgs Boson Candidate Via Its Decays to Z Boson Pairs”, CMS Collaboration, Phys. Rev. Lett. 110 (2013) 081803, TOPCITE 100+.
“Observation of a New Boson at a mass of 125 GeV with the CMS Experiment at the LHC”, CMS Collaboration, Phys. Lett. B716 (2012) 30, TOPCITE 1000+.
“Search for Microscopic Black Holes in pp Collisions at √s = 7 TeV,” CMS Collaboration, JHEP 04 (2012) 061, TOPCITE 50+.
“Search for Signatures of Extra Dimensions in the Diphoton Mass Spectrum at the Large Hadron Collider,” CMS Collaboration, Phys. Rev. Lett 108 (2012) 111801, TOPCITE 50+.
“Search for Microscopic Black Hole Signatures at the Large Hadron Collider,” CMS Collaboration, Phys. Lett. B697 (2011) 434, TOPCITE 50+.
“Search for Large Extra Dimensions in the Diphoton Final State at the Large Hadron Collider, CMS Collaboration, JHEP 05 (2011) 085.
“Performance The CMS experiment at the CERN LHC,” R. Adolphi et al., JINST 3, S08004 (2008), TOPCITE 1000+.
“Black Holes at Future Colliders and Beyond: Topical Review,” G. Landsberg, J. Phys. G32 (2006) R337, TOPCITE 50+.
“Black Holes at the LHC,” S. Dimopoulos and G. Landsberg, Phys. Rev. Lett. 87, 161602 (2001), TOPCITE 500+.
“Observation of the Top Quark,” S. Abachi et al. (DØ Collaboration), Phys. Rev. Lett. 74, 2632 (1995), TOPCITE 1000+.
“Search for Randall-Sundrum gravitons in dilepton and diphoton final states,” V.M. Abazov et al. (DØ Collaboration), Phys. Rev. Lett. 95 (2005) 091801, TOPCITE 50+.
“An Improved Measurement of the Top Quark Mass,” V.M. Abazov et al. (DØ Collaboration), Nature 429, 638 (2004), TOPCITE 100+.
“Search for large extra dimensions in dielectron and diphoton production,” B. Abbott et al. (DØ Collaboration), Phys. Rev. Lett. 86 (2001) 1156, TOPCITE 100+.
“Search for Heavy Point-Like Dirac Monopoles,” B. Abbott et al. (DØ Collaboration), Phys. Rev. Lett. 81 (1998) 524, TOPCITE 50+.
“Study of the ZZg and Zgg Couplings in Z(nn)g Production,” S. Abachi et al. (DØ Collaboration), Phys. Rev. Lett. 78 (1997) 3640, TOPCITE 50+.

Background

Education and Training

Year	Degree	Institution
1994	PhD	State University of New York at Stony Brook
1992	MS	State University of New York at Stony Brook

Honors and Awards

National Science Foundation CAREER Award - 2003-2008
Arthur P. Sloan Research Fellowship - 2001-2005
Salomon Faculty Research Award - 2000
Aditya Sambamurti Memorial Award - 1997

Researchers@Brown