Date	Discussion Leader	Topic / Paper(s)
January 16	Azmat Orazbayev	Observation of Time-Reversal Violation in the B0 Meson System, J. P. Lees et al. (BABAR Collaboration), Phys. Rev. Lett. 109, 211801 (2012). Viewpoint: Particle Decays Point to an Arrow of Time. Faculty adviser: Julie Roche
January 23	Arbin Thapaliya	Discussion of questions from previous week.
January 30	Harsha Atanayake	Dark Force Detection in Low Energy e-p Collisions arXiv:0909.2862 by M. Freytsis, G. Ovanesyan, and J. Thaler Faculty adviser: Daniel Phillips
February 6	Brian Muccioli	Discussion of questions from previous week.
February 13	Bijaya Acharya	Observation of Sequential Upsilon Suppression in PbPb Collisions, S. Chatrchyan et al. (CMS Collaboration), Phys. Rev. Lett. 109, 222301 (2012). Viewpoint: New Temperature Probe for Quark-Gluon Plasma. Faculty adviser: Justin Frantz
February 20	Alina Karki	Discussion of questions from previous week.
February 27	Nowo Riveli	Electron ion collider: the next QCD frontier arXiv:1212.1701 by Elke C. Aschenauer et al. Faculty adviser: Ken Hicks
March 13	Linda Hlophe	Discussion of questions from previous week.
March 20	Cody Parker	Cosmic Ray Radiography of the Damaged Cores of the Fukushima Reactors , Konstantin Borozdin, Steven Greene, Zarija Lukic, Edward Milner, Haruo Miyadera, Christopher Morris, and John Perry Phys. Rev. Lett. 109, 152501 (2012). Synopsis: Peeking into Fukushima's Reactors . Faculty adviser: Paul King
March 27	Andrea Richard	Discussion of questions from previous week.
April 3	Shamim Akhtar	Detection of the Second r-Process Peak Element Tellurium in Metal-Poor Stars, Ian U. Roederer et al., Astrophysical Journal 747, L8 (2012). Faculty adviser: Carl Brune
April 10	Bing Xia	Discussion of questions from previous week.
April 17	Anthony Ramirez	First Observation of Ground State Di-neutron Decay: 16Be, A. Spyrou et al., Phys. Rev. Lett. 108, 102501 (2012); see also the comment accompanying the PRL and the authors' response. Focus: Nuclei Emit Paired-up Neutrons, by M. Schirber. Faculty adviser: Charlotte Elster
April 20	Sushil Dhakal	Discussion of questions from previous week.

• Physicists hunt for dark forces from Nature, 484, 13 (2012).