Marjorie Shapiro's Home Page

Search for New Phenomena Using High Energy Hadron Collisions

Research Program:

I am an experimental particle physicist whose interests lie in probing the most basic interactions in nature. There now exists a theory of the Strong and Electroweak interactions (“the Standard Model”) that has been tested to high accuracy and that explains almost all existing experimental data. The great success of this theory provides a framework for asking even more basic questions: What is the physics that generates quark and lepton masses? What determines the size of the Fermi constant? What is the mechanism responsible for the CP noninvariance observed in nature? It is such questions that my collaborators and I hope to address.

Many extensions to the Standard Model offer possible answers to these questions. In a large class of theories we expect new phenomena to appear when quarks or leptons collide at center-of-mass energies in the range of 100 GeV to 1 TeV. At the present time, hadron colliders are the only means of reaching these energies.

I am a member of the ATLAS collaboration at the CERN Large Hadron Collider (LHC). My research on ATLAS spans many topics including searches for TeV scale gravity and for Supersymmetry, measurements sensitive to the Higgs boson coupling to top, bottom and charm quarks, measurements of the production properties of the Top quark, studies of charm production in association with W-bosons and measurements of the properties of high pT jets.

Information about me:

Email: mdshapiro@lbl.gov

Phone: 510-486-4683

Office: 50B-6227 (LBL)

           445 Physics South Hall (Campus)

Here is my CV

Links to My Experiments' Web Pages:

ATLAS The ATLAS Experiment at the LHC

Selected Talks:

• Plenary Talk EPS-2017

Recent Results in Standard Model Physics

• Colloquium at University of Toronto (2015)

Why Searching for New Physics at the LHC: Run 2 Status and Prospects

• Hadron Collider Physics Summer School: Topic: Reconstructing Simple and Complex Objects

  • Lecture 1: Reconstructing Simple Objects

  • Lecture 2: Confronting the Standard Model

  • Lecture 3: Combining Objects: Top, Higgs, SUSY

• Tech Seminar at Google:

Supersymmetry, Extra Dimensions and the Origin of Mass: Exploring the Nature of the Universe Using PetaScale Data Analysis

ATLAS Papers for which I have been a primary author:

• Luminosity Determination in $pp$ Collisions at $\sqrt{s}=7$ TeV Using the ATLAS Detector at the LHC}, Eur. Phys. J. C 71, 1630 (2011).

• Properties of jets measured from tracks in proton-proton collisions at center-of-mass energy sqrt{s}=7 TeV with the ATLAS detector, Phys. Rev. D 84, 054001 (2011).

• Measurement of the jet fragmentation function and transverse profile in proton-proton collisions at a center-of-mass energy of 7 TeV with the ATLAS detector, Eur. Phys. J. C 71, 1795 (2011).

• Search for pair production of a new quark that decays to a Z boson and a bottom quark with the ATLAS detector, Phys. Rev. Lett. 109, 071801 (2012).

• Underlying event characteristics and their dependence on jet size of charged-particle jet events in $pp$ collisions at sqrt{s}=7$ TeV with the ATLAS detector}, Phys. Rev. D 86, 072004 (2012).

• Jet energy measurement with the ATLAS detector in proton-proton collisions at $\sqrt{s}=7$ TeV}, Eur. Phys. J. C 73, 2304 (2013).

• Measurement of the production of a $W$ boson in association with a charm quark in $pp$ collisions at sqrt{s} = 7 TeV with the ATLAS detector, JHEP 1405, 068 (2014).

• Search for $WZ$ resonances in the fully leptonic channel using $pp$ collisions at \sqrt{s} = 8 TeV with the ATLAS detector, Phys. Lett. B 737, 223 (2014).

• Search for lepton--flavour--violating H→μτ decays of the Higgs boson with the ATLAS detector, JHEP 11( 2015) 211.

• Measurement of jet activity in top quark events using the $e\mu$ final state with two $b$-tagged jets in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector, JHEP 09 (2016) 074.

• Search for strong gravity in multijet final states produced in pp collisions at $\sqrt{s}=$ 13 TeV using the ATLAS detector at the LHC, JHEP 03 (2016) 026.

• Search for R-parity violating supersymmetric particles in multi-jet final states produced in p-p collisions at 13 TeV using the ATLAS detector at the LHC. Phys. Lett. B 785, 136 (2018).

• Observation of Higgs boson production in association with a top quark pair at the LHC with the ATLAS detector Phys. Lett. B 784, 173 (2018).

Graduate students who have received PhDs under my supervision

• Robert Matthew Carey July 1989 Angular Distributions of Three Jet Events in Proton-Antiproton Collisions at the Fermilab Tevatron (Harvard University)

• Robert Drucker December 1993 Properties of W + Jet Events in Proton-Antiproton Collisions at 1.8 TeV

• William Wester May 1994 A Measurement of the Mass of the Bs0 Meson in Proton-Antiproton Collision at squareroot (s) = 1.8 TeV

• Mark Peters May 1997 A Measurement of B Meson Oscillations Using Inclusive Leptons in Proton- Antiproton Collisions at 1.8 TeV

• William Ashmanskas May 1998 A Direct measurement of the W Boson Decay Width in Proton-Antiproton Collisions at 1.8 TeV

• Douglas Reher December 2000 A Search for Fully Hadronic Decay Modes of the Bc Meson at CDF

• Anthony Affolder December 2002 A Measurement of Bottom Quark-Antiquark Azimuthal Production Correlations in Proton-Antiproton Collisions at sqrt(s)=1.8 TeV

• Amy Connolly December 2003 A Search for Supersymmetric Higgs Bosons in the Di-tau Decay Mode in Proton-Antiproton Collision at 1.8 Tev

• Johannes Muelmenstadt December 2007 First observation of the decay Bs D+ K and measurement of the relative branching fractions B (Bs® DsK)/B(Bs ®Dsp)

• Amanda Deisher December 2008 A Precision Measurement of the Bs Lifetime in pp Collisions at 1.96 Te V Using Partially and Fully Reconstructed Modes

• Hung Chung Fang December 2011 A Measurement of the Relative Branching Ratio BR(B- -> D0 K-)/BR(B- ->D0 pi-) in Three D0 Decay Modes

• Joseph Virzi May 2012 A Measurement of the Underlying Event Distributions in Proton-Proton Collisions at sqrt(s) = 7 TeV in Events containing Charged Particle Jets using the ATLAS Detector at the Large Hadron Collider

• Andre Bach May 2012 Search for Pair Production of a new b' Quark that Decays into a Z Boson and a Bottom Quark with the ATLAS Detector at the LHC

• Peter Loscutoff May 2013 Search for resonant WZ → ℓν ℓℓ production using 13 fb−1 in √s = 8 TeV p-p collisions with the ATLAS detector

• Ana Ovcharova December 2014 Measurement of the top quark pair differential cross-section at high top quark transverse momentum

• Jackie Brosamer May 2016 Measurement of jets produced in top quark events using the emu final state with 2 b-tagged jets in pp collisions at 8 TeV with the ATLAS detector

• Robert Clarke May 2016 A Search for Lepton-Flavor-Violating Decays of the 125 GeV Higgs Boson with Hadronically Decaying Tau Leptons in the 20.3 fb^{-1},\sqrt{s} = 8 TeV Dataset Collected in 2012 by the ATLAS Detector at the Large Hadron Collider in 8 TeV proton-proton collision data collected with the ATLAS detector at the LHC

• Brian Amadio August 2019 A search for new physics in multijet final states of pp collisions at √s = 13 TeV using the ATLAS detector at the Large Hadron Collider

• Emily Duffield August 2019 Observation of the electroweak production of two W bosons with the same electric charge in association with two jets in pp collisions at √s = 13 TeV with the ATLAS detector

• Jennet Dickinson May 2020 ATLAS Measurements of the Higgs Boson Coupling to the Top Quark in the Higgs to Diphoton Decay Channel

• Sai Neha Santpur May 2022 Search for Non-pointing and Delayed Photons in pp collisions at sqrt(s)=13 TeV using the ATLAS detector

• Cesar Gonzalez Renteria December 2023 Measurement of the production of a vector boson in association with a charmed h\ adron in pp collisions at sqrt(s)= 13 TeV with the ATLAS detector

• Gregory Ottino December 2023 Direct Charm Reconstruction in Association with W Bosons at sqrt(s) = 13 TeV in the ATLAS