# Tao Han

**Distinguished Professor/Director of PITT PACC**

**Contact:**

University of Pittsburgh

420B Allen Hall

Pittsburgh, PA 15260 USA

Office: (412) 624-2763

Fax: (412) 624-9163

than@pitt.edu

### Grad Students

Zhen LiuRuiz, Richard

Chen, Junmou

Qian, Zhuoni

Xing Wang

Li, Zhi

### Postdocs

Brock TweedieJosh Sayre

## Research

My research field is in elementary particle physics theory, focusing on high-energy collider physics and in connection to astro-particle physics and cosmology. I formulate theoretical models of elementay particles and their interactions, and develop the strategies to test the theory by experiments and observations. This research direction, bridging the abstract theory and experimental observation, is the field of *Phenomenology.*

The fundamental questions I have been contemplating on from theory, and seeking for an answer in experiments, include

- The origin of mass for elementary particles
- Fundamental forces and their unification
- Symmetries and their breakdown: Gauge-, Super-symmetry, CP Violation etc.
- Nature of particle Dark Matter
- Property of Space-time

The experiments at the Large Hadron Collider (LHC) are collecting a staggering amount of data at the unprecedented energy and luminosity frontier. The discovery of neutrino mass and oscillation has stimulated the theoretical development for further understanding of many fundamental aspects in particle physics. Experiments and observation in cosmology and astroparticle physics have deeply reached the regime to probe dark matter hypothesis associated with the weak scale new physics. Phenomenology is thus in a golden era and I am thrilled to be part of the team at the dawn of the major discoveries associated with the above questions at the shortest distances of about 10^{-10} nm.

**Research Highlights**

- First proposal to search for Higgs to WW at the Tevatron: PRL paper, PRD paper, they were on AIP Physics News Update

- Field-theoretic formulation for large extra dimensions: The renowned Han-Lykken-Zhang paper, or on Archive

- R-parity violating interactions and phenomenological layout: The renowned Barger-Giudice-Han paper

- "Central jet-vetoing" first introducted: The Barger-Cheung-Han-Phillips paper

- "Forward jet-tagging" early work: The Barger-Han-Phillips paper
- WW scattering at the LHC: The "Bagger et al."
- Theoretical motivition for a muon collider: Physics Report by the "Muon-collider Quartet"

- "Little Higgs" phenomenology and theory layout: The HLMW paper, or on Archive

- Majorana neutrinos at the LHC: Han-Zhang's PRL paper, it was on ScienceWatch

- The test of Seesaw mechanism at the LHC: HMSW's PRD paper, it was also on ScienceWatch

- First LHC bounds on BSM physics: Colored resonances: The largest rate and simplest topology

**Representative Presentations**

- Higgsology
#### Collider Phenomenology and New Physics , Series Lectures at the Sheffield Summer Institute, 2008

#### Collider Phenomenology , TASI-2004 Lectures hep-ph/0508097, Update version

#### The Tera-scale (pdf) , (ppt) , a colloquium on Tera-scale physics

#### The Quest for Mass , a colloquium on mass

#### Review for BSM, lecture at the CTEQ--04 summer school

#### Little Higgs Phenomenology , a seminar

#### Physics with Extra Dimensions , a colloquium

#### Top Quark Physics at the LHC , a seminar

#### The Test of Seesaw at the LHC , a seminar

## Publications

Recent Publications:

**Discovery in Drell-Yan Processes at the LHC.**Cheng-Wei Chiang, Neil D. Christensen, Gui-Jun Ding, Tao Han, e-Print:**arXiv:1107.5830 [hep-ph]**

**Baryon number violation at the LHC: the top option.**Zhe Dong, Gauthier Durieux, Jean-Marc Gerard, Tao Han, Fabio Maltoni. e-Print:**arXiv:1107.3805 [hep-ph]****Phenomenology of a lepton triplet.**Antonio Delgado, Camilo Garcia Cely, Tao Han, Zhihui Wang,**Phys.Rev. D84 (2011) 073007,**e-Print:**arXiv:1105.5417 [hep-ph]****Lepton Number Violation from Colored States at the LHC.**Pavel Fileviez Perez, Tao Han, Sogee Spinner, Maike K. Trenkel,**JHEP 1101 (2011) 046,**e-Print:**arXiv:1010.5802 [hep-ph]****Chiral Couplings of W' and Top Quark Polarization at the LHC.**Shrihari Gopalakrishna, Tao Han, Ian Lewis, Zong-guo Si, Yu-Feng Zhou,**Phys.Rev. D82 (2010) 115020.**

**Nearly Degenerate Gauginos and Dark Matter at the LHC.**Gian F. Giudice, Tao Han, Kai Wang, Lian-Tao Wang,**Phys.Rev. D81 (2010) 115011**, e-Print:**arXiv:1004.4902 [hep-ph]****New Physics Signals in Longitudinal Gauge Boson Scattering at the LHC.**Tao Han, David Krohn, Lian-Tao Wang, Wenhan Zhu,**JHEP 1003 (2010) 082,**e-Print:**arXiv:0911.3656 [hep-ph]**