research.html

New physics at the Tevatron and the LHC

First and foremost, we have to be ready to make the necessary discoveries. For theorists, it is our duty to think of new scenarios of new physics, and propose novel signatures to study them. On the other hand, after the discovery of new physics at LHC, the most pressing challenge will be to derive as much information as possible from the data with as little assumption about specific model as possible.

A lot of work need to be done. This is the focus of my current research. Here is a list of things that I have worked on.

New Jet Algorithm:

1. D. Krohn, J. Thaler and L. T. Wang, ``Jets with Variable R," JHEP 0906, 059 (2009), [arXiv:0903.0392 [hep-ph]]. We have a plugin to fastjet if you would like to test this algorithm.

Top quark related new phsyics signals:

Boosted Tops:

1. J. Thaler and L. T. Wang, ``Strategies to Identify Boosted Tops,'' JHEP 0807, 092 (2008), [arXiv:0806.0023 [hep-ph]].

2. B. Lillie, L. Randall and L. T. Wang,``The Bulk RS KK-gluon at the LHC,'' JHEP 0709, 074 (2007), [arXiv:hep-ph/0701166].

Top partners:

1. B. S. Acharya, P. Grajek, G. L. Kane, E. Kuflik, K. Suruliz and L. T. Wang, ``Identifying Multi-Top Events from Gluino Decay at the LHC,''
arXiv:0901.3367 [hep-ph].

2. T. Han, R. Mahbubani, D. G. E. Walker and L. T. Wang, ``Top Quark Pair plus Large Missing Energy at the LHC,'' JHEP {\bf 0905}, 117 (2009) [arXiv:0803.3820 [hep-ph]].

3. T-parity top sector of Little Higgs models (with Hsin-Chia Cheng, Ian Low, hep-ph/0510225 )

In a more natural way to embed the heavy top sector, the top partner is actually odd. We outline the phenomenology characteristic of such a scenario as well as the challenge to distinguish it from stops in superysmmetry.

Spin Measurements

1. G. L. Kane, A. A. Petrov, J. Shao and L. T. Wang, ``Initial determination of the spins of the gluino and squarks at LHC,''
arXiv:0805.1397 [hep-ph].

2. C. Kilic, L. T. Wang and I. Yavin, ``On the Existence of Angular Correlations in Decays with Heavy Matter Partners,''
JHEP 0705, 052 (2007), [arXiv:hep-ph/0703085].

3. Spin Measurements in cascade decays at the LHC (with Itay Yavin, hep-ph/0605296)

Model building with Z' mediated supersymmetry breaking:

1. P. Langacker, G. Paz, L. T. Wang and I. Yavin, ``Aspects of Z'-mediated Supersymmetry Breaking,''
Phys. Rev. D 77, 085033 (2008) [arXiv:0801.3693 [hep-ph]].

2. H. Verlinde, L. T. Wang, M. Wijnholt and I. Yavin, ``A Higher Form (of) Mediation,'' JHEP 0802, 082 (2008)
[arXiv:0711.3214 [hep-th]].

3. R. Dermisek, H. Verlinde and L. T. Wang, ``Hypercharged Anomaly Mediation,''
Phys. Rev. Lett. 100, 131804 (2008), [arXiv:0711.3211 [hep-ph]].

4. P. Langacker, G. Paz, L. T. Wang and I. Yavin, ``Z'-mediated Supersymmetry Breaking,''
Phys. Rev. Lett. 100, 041802 (2008), [arXiv:0710.1632 [hep-ph]].

	Probing new physics with gg->hh (with Aaron Pierce and Jesse Thaler, hep-ph/0609049)
	Use Z-prime to measure slepton properties (with Matthew Baumgart, Tom Hartman, and Can Kilic, hep-ph/0608172)
	Little M-theory (with Hsin-Chia Cheng and Jesse Thaler, hep-ph/0607205) Simple group Little Higgs? Product group Little Higgs? Holographic Higgs? It turns out they should be thought of as part of a connected bigger model space, described conveniently in the deconstruction (or moose) language. Little M theory is a description of one example of such a model space.

	Inverse Problem of Supersymmetry at the LHC (with Nima Arkani-Hamed, Gordon Kane, and Jesse Thaler, hep-ph/0512190) Suppose LHC make extrordinary discovery during the first couple of years of running, how well can we interpret the data and uncover the new physics behind it? With Nima Arkani-Hamed, Gordon Kane and Jesse Thaler, we developed a general method which could 1) Statistically estimate the number of ambiguities in interpeting data in any model with any number of parameters, based on any set of experimental observables. 2) Evaluate the effectiveness of any particular observables. 3) Map out classes of denegeracies.