## Tentative Schedule

### October 5

Speaker: Guillaume Plante, Columbia University

Abstract:

The XENON100 experiment, currently in operation at the Laboratori Nazionali del Gran Sasso in Italy, aims at detecting dark matter weakly interacting massive particles (WIMPs) scattering off nuclei within its 62 kg liquid xenon (LXe) target by simultaneously measuring the scintillation and ionization signals produced by nuclear recoils. These two signals allow the three-dimensional localization of events with millimeter precision and the ability to fiducialize the target volume, yielding an inner core with a very low background. As the energy scale is based on the scintillation signal of low-energy nuclear recoils, the precise knowledge of their scintillation efficiency is of prime importance. I will describe the apparatus and method used in our recent measurement of the relative scintillation efficiency of nuclear recoils in LXe, Leff, performed with a new single phase detector, designed and built specifically for this purpose. Finally, I will present the recent XENON100 results obtained from 100 live days of data acquired in 2010 and discuss the current status of the experiment and its evolution into XENON1T.

### October 19

Speaker: Prof. Omar Benhar, INFN and Department of Physics "Sapienza" Universita' di Roma, Italy

Abstract:

It has been suggested that the difficulties in the interpretation of flux averaged  double-differential neutrino-carbon cross section measured by the MiniBooNE collaboration may due to contributions arising from reaction mechanisms other than single-nucleon knockout. The analysis of the the large data base of inclusive electron scattering data allows one to pin down the role of the relevant mechanisms  in a variety of kinematical regimes, thus shedding light on some of the unresolved issues of neutrino-nucleus scattering. As an example, I will argue that it may help to reconcile the different values of the nucleon axial mass reported by the MiniBooNe  and NOMAD collaborations.

### November 9

Speaker: Matthew Toups, Columbia University

Abstract:

In this talk we present the first results from 100 days of running of the Double Chooz detector. This experiment searches for the last unmeasured mixing angle, $\theta_{13}$,  in the three-neutrino mixing matrix, via the disappearance of $\bar \nu_e$ produced by the dual 4.27 GWth  Chooz B Reactors.  We demonstrate that the detector is running well.  With this data set, we fit total interaction rate and energy  dependence to extract the mixing parameter at  $\Delta m2_{31}=2.4\times10^{-3}$ eV$^2$.  We find $\sin2 2 \theta_{13} = 0.085 \pm 0.051$.   This is an important  first step in our multi-year program to  establish the magnitude of  $\theta_{13}$ and a valuable input to today's  global fits to the
three-neutrino oscillation model.

### November 16

Speaker: Alex Sousa, Harvard University

Abstract:

Neutrino physics continues to generate baffling surprises and the measurement of neutrino properties still poses many experimental challenges. The MINOS long-baseline neutrino experiment, located at Fermilab and northern Minnesota, uses the most powerful neutrino beam in operation to measure neutrino oscillation phenomena with unprecedented precision. I present the most recent results from MINOS and describe the future plans for the new MINOS+ project, which proposes to operate the MINOS detectors with an upgraded 700 kW neutrino beam.

### November 30

Speaker: Gary Cheng, Columbia University

Abstract:

The Booster Neutrino Beam (BNB) at Fermilab collides 8.9 GeV protons on a Be target to provide neutrinos for current (MiniBooNE) and future (MicroBooNE) experiments. A complete understanding of BNB’s neutrino flux is crucial for ongoing and future analyses of these experiments. The analysis to be presented uses SciBooNE, a precision neutrino cross-section detector placed in the BNB, to measure the K+ production cross-section at BNB’s Be target through high energy daughter muon neutrino scattering data off of SciBooNE’s polystyrene (C8H8) target. The validation of K+ production cross-section modeling using Feynman scaling to BNB’s p-Be interaction energy levels will be argued and a K+ production cross-section measurement at 8.9 GeV will be presented.

### December 7

Speaker: Prof. Sarah Demers, Yale University

Abstract:

The Large Hadron Collider brings a new energy frontier to particle physics with exciting opportunities for discovery.  Tau leptons are prominent in the Large Hadron Collider (LHC) at CERN brings a new energy frontier to collider physics with exciting opportunities for discovery. Tau leptons, as members of the least-explored 3rd generation and as the most massive lepton, appear in many new physics searches at the LHC.  For example, the discovery of the Standard Model higgs boson as well as the supersymmetric charged and neutral higgs bosons can depend primarily on decays involving taus in many possible scenarios due to enhanced couplings of the Higgs to taus.  In addition, the ability to study the polarization, parity, and spin correlations of resonances decaying to taus make them powerful probes of the details of whatever new physics is uncovered.  Experience with taus from Monte Carlo Simulation, the TeVatron and the LHC warn us of the difficulty of analyses with taus in the environment of a hadron collider while providing us with insights into overcoming the challenges. In this talk I will describe some current results from searches with taus from ATLAS and CMS as well as analysis techniques that allow us to separate physics with taus from the ubiquitous, and similar in signature, backgrounds.