Lynne H' Orr, PI

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Task A TheoryA1 Phenomenology

• Lynne H. Orr, PI
• University of Rochester
• DOE Progress Report, 2002-03
• July 23, 2003

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Personnel

• Faculty A. Das L. Orr (PI) S.
  Rajeev S. Okubo C.R. Hagen (through '02)
• Postdocs D. Wackeroth (1999-2002) N.
  Kidonakis (May-Aug. 2002) X. Zhou (Jan.-June
  2003) A. Ghinculov (2002-2003)
• Visitors V.Alves, J.Frenkel,S.Krivonos S.Per
  ez, Z.Popowicz

• Graduate students A. Agarwal L. Akant
  D. Berdine (M.S.) J. Boersma A.
  Constandache G. Krishnaswamy A.
  Melikyan A. Mitov
• Undergraduates D. Berdine (2002-'03)

Supported in part by NSF or other sources.
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Introduction

• Rochester theory forefront of particle theory
  research mathematical physics quantum
  field theory phenomenology
• Professional activities highlights -- 52
  publications in refereed journals -- 60 talks
  (46 invited) at conferences, seminars,
  colloquia -- 3 books published or
  forthcoming -- Das elected APS Fellow in
  2002 -- Orr co-convener, Top/QCD Group,
  American Linear Collider Working Group --
  Okubo International Advisory Committee, XXIV
  International Colloquium on Group Theoretical
  Methods in Physics

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• Postdoctoral research associates Rochester
  theory postdocs have been very active, and have
  gone on to excellent positions

Name Year Current Position C. Kao 1996 Junior
faculty, U. Oklahoma S. Pernice 1997 Junior
faculty, U. Buenos Aires M. Bisset 1998 Junior
faculty, Tsinghua U., Beijing R.
Szalapski 1999 Systems Analyst, Avanti Systems O.
Kong 1999 Junior faculty, Nat'l Central U.,
Taiwan V. John 2000 Finance G.
Corcella 2001 Research Assoc., CERN D.
Wackeroth 2002 Junior faculty, SUNY Buffalo A.
Ghinculov 2003 Merill Lynch

• Graduate students Among finest in the
  department, including -- Okubo prize winners
  (best prelim performance) -- Sproull fellowship
  (university-wide competition)
• -- Prestigious subsequent positions (next
  slide)
• Undergraduate students Strong history of
  participation -- APS Apker Prize for best
  thesis (Krishnaswami) -- Graduate schools
  include Chicago, UC Berkeley, Rochester

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Alexander Mitov 2003 L. Orr RA, University of
Hawaii Levent Akant 2003 S. Rajeev RA, Feza
Gursey Institute, Turkey
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C. Richard HagenQuantum Field Theory

• Hagen's research was supported by this grant
  through 2002. No further support is requested.
• Research topics
• Galilean relativity in field theory
• Unification of 2-D soluble vector coupling models
• Chern-Simons theory in 21 D and Aharonv-Bohm
  effect
• Finite Temperature field theory

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Susumu OkuboMathematical Physics

• Retired from teaching, but still active in
  research (8 papers in 2002-03). Receives nominal
  support from Task A.
• Research studies mathematical symmetries with
  aim of physics applications
• Non-asssociative algebras
• Exceptional Lie algebras
• Global symmetires of time-independent Schrodinger
  equations
• Linear, inverse quadratic, quadratic potentials

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Ashok DasM Theory, Finite Temperature Field
Theory, Integrable Models

• Personnel
• Postdoc X. Zhou
• Visitors V.Alves, J.Frenkel,S.Krivonos, S.Perez,
  Z.Popowicz
• Graduate students A. Constandache (arrived
  1998), A. Melikyan (1999)
• Professional Activities
• Elected APS Fellow, 2002, for contributions to
  supergravity, integrable models, and finite
  temperature field theory
• 23 refereed publications
• 3 books published or forthcoming
• Many invited talks and lectures, including
  Brazil, Chile, Poland, India, US
• Scientific Organizing Committee, Conference on
  Symmetries, Dubna, July 2003

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Ashok Das Research

• Integrable models
• This class of exactly solvable systems appears in
  string theory, M theory, and topological field
  theories.
• Das has studied these systems, with results
  including
• construction and characterization of conserved
  charges (resulting from symmetries) that do not
  arise from the conventional description
• Finite temperature field theory
• Finite temperature field theory is needed to
  describe phase transitions, including the
  electroweak phase transition in the early
  universe and the transition from ordinary matter
  to quark-gluon plasma.
• Das continues to do seminal work in this field
• He wrote the book Field Theories at Finite
  Temperature
• Screening length and magnetic mass in
  Chern-Simons theories
• Non-commutative theories
• Light-front theories

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Ashok Das Research, continued

• M Theory, non-commutative field theories, extra
  large dimensions
• M(embrane) theory is our latest candidate for a
  Theory of Everything.
• Das has made significant progress in showing how
  to quantize a particular class of membranes.
• Non-commutative theories are also becoming
  important, and Das has shown how to calculate
  physical quantities (e.g. photon self-energy) in
  these theories
• Extra large dimensions could provide the key to
  solving the electroweak hierarchy problem.
• Das has shown how a systematic study of the
  radion -- a new degree of freedom that arises in
  the Randall-Sundrum version of these models --
  can be carried out from a geometrical point of
  view

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Lynne H. OrrCollider Phenomenology, Radiative
Corrections

• Personnel
• Postdocs D. Wackeroth, A. Ghinculov
• Postodoctoral visitor N. Kidonakis
• Graduate students D. Berdine (MS), J. Boersma
  (arrived 2002), A. Mitov (1999 Ph.D. 2003)
• Undergraduate student D. Berdine (2002-03)
• Professional Activities
• Co-convener, Top/QCD group, American Linear
  Collider Working Group
• APS J.J. Sakurai Prize selection committee
• 8 refereed publications
• 20 presenations, including
• Conference Summary (Theory), 2003 QCD Rencontres
  de Moriond, Les Arcs, France
• Plenary talk, 2002 Phenomenology Symposium,
  Madison, WI
• Plenary talk, Loopfest I, Brookhaven National
  Lab, June 2003
• 8 talks by graduate students 3 talks by
  undergraduate students
• Activities to encourage recruitment and retention
  of women in physics, including co-direction of
  Physics Undergraduate Teaching Internship Program

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Lynne H. Orr Research

• Motivation What lies beyond the Standard Model
  and what is the key to electroweak symmetry
  breaking? How can we test the SM and answer
  these questions experimentally?

• Top quark physics
• Top phenomenology at present and future
  colliders. Synergy with experimental group.
• Systematic study of QCD effects in top quark
  physics
• Tevatron, LHC gluon radiation and mass
  reconstruction
• Future linear ee- collider
• In progress combine QCD and electroweak
  corrections (for ee) to obtain full NLO
  calculation of top production and decay

ee- -gt t t
--- LO --- on-shell NLO --- off-shell NLO
C.Macesanu and L.Orr
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Lynne H. Orr Research, continued

• QCD corrections to top-Higgs associated
  production
• Tevatron postdoc D. Wackeroth (and Reina,
  Dawson)
• LHC Orr, Wackeroth, Dawson, Reina

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Lynne H. Orr Research, continued

• QCD corrections to top-Higgs associated
  production, continued

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Lynne H. Orr Research, continued

• QCD corrections to top-Higgs associated
  production, continued

From S. Dawson, L. Orr, L. Reina, D. Wackeroth,
Phys.Rev. D67071503,2003
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Lynne H. Orr Research, continued

• QCD corrections to top-Higgs associated
  production, continued
• In progress and planned distributions, soft
  gluon resummation

• Supersymmetry
• SUSY is a leading candidate for the explanation
  of electroweak
• symmetry breaking.
• MSSM and general two-Higgs double model with
  C. Kao, Orr has studied production of ZA at the
  LHC
• R-parity violating models past work

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D. Wackeroth, postdoc

• Precision electroweak physics
• RacoonWW Electroweak radiative
  corrections to WW production at LEP2

http//ltpth.web.psi.ch/racoonww/racoonww.html
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A. Ghinculov, postdoc

• Two-loop radiative corrections
• Rare B decays

Near completion!
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Sarada RajeevNonperturbative Field Theory,
Mathematical Physics

• Personnel
• Graduate students A. Agarwal (arrived 1999), L.
  Akant (1997 Ph.D. 2003), G. Krishnaswami (1999)
• Professional Activities
• 7 refereed publications
• 16 talks by group members, including many
  international invited presentations, including
• Plenary talk at 2003 MRST conference
• Talks by graduate students
• Advisory committee, Conference on Spacetime and
  Fundamental Interactions, Salerno, Italy
• Organizer, Rochester mathematical physics
  discussion group

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Sarada Rajeev Research

• Underlying motivation How to describe
  Yang-Mills theory (e.g. the gauge theory of the
  Standard Model) even in the nonperturbative
  regime? In particular, can we have a quantum
  theory of hadrons?
• Approach Simplify the problem reduce the
  dimensionality of space-time, take the large-N
  limit, work with matrix models. Extract the
  essential features and apply to the more
  difficult problem

Valence quark parton density function (DATAMRS
fit)

• Hadrons in 2 space-time dimensions
• Rajeev's earlier Skyrme theory of hadrons in 2-D
  gluon degrees of freedom can be neglected.
  Recently apply to Deep Inelastic Scattering to
  obtain parton momentum distribution functions
  from first principles.

G.Krishnaswami and S.Rajeev, Phys. Lett. B441
(1998) 429.
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Sarada Rajeev Research, continued

• Yang-Mills in 21 Dimensions
• Find a general theory of hadrons and reproduce
  the hadron spectrum
• Loop space formulation of gauge theories
• Hadron theory dynamical variables closed
  loops in spacetime new mathematical ideas
  needed. Connections to modern mathematical
  ideas.
• Large N limit as new classical limit
• SU(3) -gt SU(N), N large quantum fluctuations
  die off as 1/N
• Get classical limit with large N.
• Rajeev has studied this limit and is wrtiting a
  book compiling his work.
• Matrix models
• Non-commutative geometry and connections to
  probability theory

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Sources of Support

• The DOE theory core budget provides the primary
  support for the theory group, including graduate
  students, postdocs, administrative personnel,
  faculty summer, travel, materials, supplies,
  computing
• Task A1 (2001-02) was supported through the
  Linear Collider Detector studies
• Additional support
• Orr's NSF Career Award (1996-2000)
• Das's NSF US/Brazil Cooperative Research Grant
• Physics Dept. NSF Research Experience for
  Undergraduates
• University support, including fellowships and
  tuition waivers Krishnaswami Sproull Graduate
  Fellowship