Award Abstract # 0855561
Global QCD Analysis and Electroweak Symmetry Breaking in High Energy Collider Phenomenology

NSF Org: PHY
Division Of Physics
Recipient: MICHIGAN STATE UNIVERSITY
Initial Amendment Date: August 26, 2009
Latest Amendment Date: August 28, 2013
Award Number: 0855561
Award Instrument: Continuing Grant
Program Manager: Keith Dienes
kdienes@nsf.gov
 (703)292-5314
PHY
 Division Of Physics
MPS
 Directorate for Mathematical and Physical Sciences
Start Date: September 1, 2009
End Date: August 31, 2015 (Estimated)
Total Intended Award Amount: $1,350,000.00
Total Awarded Amount to Date: $1,350,000.00
Funds Obligated to Date: FY 2009 = $270,000.00
FY 2010 = $270,000.00

FY 2011 = $270,000.00

FY 2012 = $270,000.00

FY 2013 = $270,000.00
History of Investigator:
  • Chien-Peng Yuan (Principal Investigator)
    yuan@pa.msu.edu
  • Jon Pumplin (Co-Principal Investigator)
  • Wu-ki Tung (Former Co-Principal Investigator)
Recipient Sponsored Research Office: Michigan State University
426 AUDITORIUM RD RM 2
EAST LANSING
MI  US  48824-2600
(517)355-5040
Sponsor Congressional District: 07
Primary Place of Performance: Michigan State University
426 AUDITORIUM RD RM 2
EAST LANSING
MI  US  48824-2600
Primary Place of Performance
Congressional District:
07
Unique Entity Identifier (UEI): R28EKN92ZTZ9
Parent UEI: VJKZC4D1JN36
NSF Program(s): Elem. Particle Physics/Theory
Primary Program Source: 01000910DB NSF RESEARCH & RELATED ACTIVIT
01001011DB NSF RESEARCH & RELATED ACTIVIT

01001112DB NSF RESEARCH & RELATED ACTIVIT

01001213DB NSF RESEARCH & RELATED ACTIVIT

01001314DB NSF RESEARCH & RELATED ACTIVIT
Program Reference Code(s): 0000, OTHR
Program Element Code(s): 128600
Award Agency Code: 4900
Fund Agency Code: 4900
Assistance Listing Number(s): 47.049

ABSTRACT

Current understanding of high energy physics is embodied in the Standard Model (SM). According to that theory, protons and neutrons, along with all other strongly interacting particles, are composed of even more fundamental particles called partons (quarks and gluons). Interactions between the partons are described by the theory of Quantum Chromodynamics (QCD). The proposed research involves continued refinement in understanding the interplay between QCD theory and experiment, which is necessary to deepen the understanding of QCD and to determine the probability distributions of the partons in the proton by global analysis. The resulting CTEQ Parton Distributions are essential to the interpretation of experiments at the world's leading high energy collider facilities: Fermilab (Batavia, IL), DESY (Hamburg, Germany), RHIC (Brookhaven, NY), and CERN (Geneva, Switzerland). The Electroweak sector of the SM is extremely successful in explaining and predicting experimental data spanning a range in energy from the atomic scale to the Z boson mass.
However, one major aspect of the model remains to be elucidated: the mechanism of Electroweak Symmetry Breaking (EWSB), which generates masses for the W and Z bosons while leaving electromagnetic gauge symmetry intact. In the SM, EWSB is economically implemented through a single scalar particle called the Higgs boson. However, the SM cannot explain observations such as the hierarchical pattern of fermion masses, or the existence of dark matter; so it is widely believed that new measurements at very high energies, or very high precision, will soon turn up deviations from the SM that will point to new physics.

A second part of the project represents continuation of research to probe the EWSB mechanism in high energy collisions. Special consideration is given to measuring the couplings of the top quark to W and Z gauge bosons and to (elementary or composite) Higgs boson(s); and to searching for the Higgs boson and determining its properties. These are prime objectives of experiments at the Fermilab Tevatron collider and the CERN Large Hadron Collider (LHC).

The broader impacts of this project are as follows: The achievement of the project will contribute to understanding of the fundamental interactions in Nature. The project trains graduate students and postdoctoral fellows in theoretical high energy physics at MSU and at the CTEQ summer schools. It also provides opportunities for undergraduate students to participate in research through the REU program, and for high school teachers and middle school students to experience forefront research through Summer programs sponsored by MSU and the State of Michigan.

PUBLICATIONS PRODUCED AS A RESULT OF THIS RESEARCH

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(Showing: 1 - 10 of 34)
Marco Guzzi, Pavel M. Nadolsky, Hung-Liang Lai, and C.-P. Yuan "General-mass treatment for deep inelastic scattering at two-loop accuracy" Physical Review D , v.86 , 2012 , p.3005 10.1103/PhysRevD.86.053005
Cao, QH; Berger, EL; Yu, JH; Yuan, CP "Calculation of associated production of a top quark and a W ' at the LHC" PHYSICAL REVIEW D , v.84 , 2011 View record at Web of Science 10.1103/PhysRevD.84.09502
Cao, Qing-Hong; Li, Zhao; Yu, Jiang-Hao; Yuan, C.-P. "Title: Discovery and identification of W' and Z' in SU(2)1?SU(2)2?U(1)X models at the LHC" Physical Review D , v.86 , 2012 , p.5010 10.1103/PhysRevD.86.095010
Chivukula, RS; Simmons, EH; Yuan, CP "Axigluons cannot explain the observed top quark forward-backward asymmetry" Physical review D , v.82 , 2010 , p.094009
Gao, J; Li, CS; Li, BH; Zhu, HX; Yuan, CP "Next-to-leading order QCD corrections to the heavy resonance production and decay into top" physical review D , v.82 , 2010 , p.014
Gao, J; Li, CS; Wang, J; Zhu, HX; Yuan, CP "Next-to-leading QCD effect to the quark compositeness search at the LHC" Physical review Letters , v.106 , 2011 , p.142001
Gao, Jun; Liang, Zhihua; Soper, Davison E.; Lai, Hung-Liang; Nadolsky, Pavel M.; Yuan, C.-P. "MEKS: A program for computation of inclusive jet cross sections at hadron colliders" Computer Physics Communications , v.184 , 2013 , p.1626-1642 10.1016/j.cpc.2013.01.022
Heim, S; Cao, QH; Schwienhorst, R; Yuan, CP "Next-to-leading order QCD corrections to s-channel single top quark production and decay at the LHC" PHYSICAL REVIEW D , v.81 , 2010 View record at Web of Science 10.1103/PhysRevD.81.03400
Hsieh, K; Schmitz, K; Yu, JH; Yuan, CP "Global Analysis of General SU(2) $\times$ SU(2) $\times$ U(1) Models with Precision Data" physical review D , v.82 , 2010 , p.035
Hsieh, K; Schmitz, K; Yu, JH; Yuan, CP "Global Analysis of General SU(2) $\times$ SU(2) $\times$ U(1) Models with Precision Data" physical review D , v.82 , 2010 , p.035 10.1103/PhysRevD.82.035011
Jun Gao, Marco Guzzi, Joey Huston, Hung-Liang Lai, Zhao Li, Pavel Nadolsky, Jon Pumplin, Daniel Stump, anc C.-P. Yuan "The CT10 NNLO Global Analysis of QCD" Phys. Rev. D , v.89 , 2014 , p.033009 10.1103/PhysRevD.89.033009
(Showing: 1 - 10 of 34)

PROJECT OUTCOMES REPORT

Disclaimer

This Project Outcomes Report for the General Public is displayed verbatim as submitted by the Principal Investigator (PI) for this award. Any opinions, findings, and conclusions or recommendations expressed in this Report are those of the PI and do not necessarily reflect the views of the National Science Foundation; NSF has not approved or endorsed its content.

The project supported by this award concerns basic research on the fundamental particles and fields, and their interactions, as explored by theory and experiments in high energy physics.


Intellectual Merit:

The main outcomes of this award, covering the entire life of the award (07/01/2009 – 08/31/2015), consists of two parts and are summarized as follows.

CTEQ-TEA (CT) PDFs

Current understanding of high energy physics is embodied in the Standard Model (SM). Protons and neutrons, and all other strongly interacting particles, are composed of fundamental particles called partons (quarks and gluons). Interactions between the partons are described by the theory of Quantum Chromodynamics (QCD). The research projects supported by this award involve the interplay between QCD theory and experimental data from many experiments, including recent experiments at the CERN Large Hadron Collider (LHC). This global analysis of data is necessary to deepen the understanding of QCD, and to determine the probability distributions of the partons inside the proton. The resulting “CTEQ (CTEQ-TEA) Parton Distribution Functions (PDFs)” have been essential to the interpretation of experiments at the world’s leading high energy collider facilities: Fermilab (Batavia, IL), RHIC (Brookhaven, NY), DESY (Hamburg, Germany), and CERN (Geneva, Switzerland). With that, we continue our world-leading contributions to enable making precision predictions on collider phenomenology and precise determination of the SM parameters at lepton-hadron and hadron-hadron colliders, relevant to the High Energy Physics and Nuclear Physics communities.

One of the main outcomes of this award includes the first next-to-next-to-leading order PDF analysis performed by the CTEQ-TEA group. The resulting PDF sets are called CT10 PDFs which have been widely used by High Energy Physics and Nuclear Physics communities around the world, and they were made available to the public via the web site http://hep.pa.msu.edu/cteq/public/ct10.html

Resummation portal at MSU: ResBos

Transverse momentum (or QT) resummation generalizes the conventional collinear factorization in QCD theory for hadronic processes to calculate both normalization and shape of particle distributions produced at hadron colliders such as the LHC. Since its conception in the late 1970's, QT resummation has been successfully applied to study all-order structure of hadronic differential distributions and provide excellent predictions for a variety of experiments. With this award, we have further developed the QT resummation methods for collider processes relevant to the phenomenology of weak gauge (W and Z) bosons, Higgs boson, photon pairs, and New Physics particles (such as W-prime and Z-prime bosons). They have been implemented in the ResBos code, which has been widely used by High Energy Physics and Nuclear Physics communities around the world, which is made available to the public via the web site http://hep.pa.msu.edu/resum.

 

Broader Impact:

This award contributes to understanding the fundamental interactions of Nature. This project trained graduate students and postdoctoral fellows in theoretical high energy physics at MSU, and at the CTEQ summer schools. It also provided opportunities for undergraduate students to participate in forefront research through the REU program, and for high school teachers and middle school students to experience physics through summer programs sponsored by MSU and the State of Michigan.

 


Last Modified: 11/20/2015
Modified by: Chien-Peng Yuan

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