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 Center for Neutrino Physics Center for Neutrino Physics Seminars Fall 2012 - Spring 2013 [ Aug | Sept | Oct | Nov | Dec | Jan | Feb | Mar | Apr | May ] 2011-2012 2013-2014
 August 2012 Aug 15 (Wed)4:00pm - 5:30pm304 Robeson Summer Break Aug 22 (Wed)4:00pm - 5:30pm304 Robeson Summer Break Aug 29 (Wed)4:00pm - 5:30pm304 Robeson September 2012 Sept 5 (Wed)4:00pm - 5:30pm304 Robeson Sept 12 (Wed)4:00pm - 5:30pm304 Robeson (Poster) Prof. Lisa Whitehead Minos Latest Experimental Results The MINOS experiment is a long-baseline neutrino oscillation experiment based at Fermilab. MINOS studies the interactions of neutrinos produced by the Fermilab NuMI beam line in two detectors, 734 km apart. Comparisons of the energy spectra and beam composition at the two sites yield precision measurements of neutrino oscillations. MINOS ended its highly successful run in the spring of this year. In this talk, I will give an overview of the most recent results from MINOS, including the muon neutrino disappearance and electron neutrino appearance results from the complete data set and the updated neutrino time-of-flight measurement. http://uhhep.phys.uh.edu/~whitehead/Whitehead_MINOS_VATech_20120912.pdf Host: Camillo Mariani Sept 19 (Wed)4:00pm - 5:30pm304 Robeson Sept 26 (Wed)4:00pm - 5:30pm304 Robeson (Poster) Chen Sun (Virginia Tech) Summary of the SLAC Summer School 2012 The theme of this year's SLAC Summer Institute, held from July 23 to August 3 in Stanford California, was "The Electroweak Scale: Unraveling the Mysteries at the LHC." It focused on the recent LHC results and their implications for the physics at the Electroweak scale and beyond. In this talk, I will review the statistical analyses required to interpret the experimental data, and how to read all the experimental results, with particular emphasis on the Higgs boson search. The latest Higgs search results will be also be reviewed, as well as the prospects of future discoveries. October 2012 Oct 3 (Wed)4:00pm - 5:30pm304 Robeson Oct 10 (Wed)4:00pm - 5:30pm304 Robeson (Poster) (slides) Dr. Igor Ostrovskiy EXO Latest Results The EXO (Enriched Xenon Observatory) experiment is searching for neutrinoless double beta decay of Xe-136. Such a process would violate conservation of lepton number, and its discovery would prove that neutrinos are Majorana particles, as well as determine the absolute mass scale of neutrinos. In its current implementation, called EXO-200, the experiment uses a time projection chamber filled with O(100) kg of liquid xenon, enriched in Xe-136 isotope. The detector was designed and constructed to provide extremely low levels of background contamination, and is operated half a mile underground at the WIPP facility close to Carlsbad, New Mexico. In August 2011, the EXO collaboration was the first to successfully measure the two-neutrino mode of the double beta decay of Xe-136, and in May 2012 placed a limit on the neutrinoless mode (T1/2 >1.6e25 years @90C.L.) In this talk I will describe the EXO-200 design, present its latest physics results, and give an outlook for the next generation of the experiment. Host: Camillo Mariani Oct 17 (Wed)4:00pm - 5:30pm304 Robeson (Poster) Zach Lewis (Virginia Tech) Supercorrelations in Quantum Theory defined over Galois Fields As famously established by Bell, there exists a bound on the strength of correlattions between measurement outcomes that are predicted by a classical theory. He also established, and experiment later confirmed, that quantum mechanics allows this bound to be exceeded. Tsirelson then showed that quantum correlations are themselves bounded. In this talk, I will demonstrate that in a quantum theory defined over galois fields, as  opposed to Hilbert spaces, there exist states for which Tsirelson's bound is exceeded. Oct 24 (Wed)4:00pm - 5:30pm304 Robeson (Poster) Prof. Murat Gunaydin Spectrum generating symmetries, minimal unitary representations and AdS/CFT dualities I will review the work on conformal and quasiconformal extensions of global symmetry groups of 5D and 4D supergravity theories that act as their spectrum generating symmetry groups, respectively. The quantization of quasiconformal group actions leads directly to their minimal unitary representations. I will then discuss the connections between quantum spectra of extended 4D supergravity theories with symmetric target spaces and unitary representations of quasiconformal extensions of their global symmetry groups. Finally I will discuss the fundamental role minimal unitary representations play in AdS/CFT dualities. Host: Djordje Minic Oct 31 (Wed)4:00pm - 5:30pm304 Robeson (Poster) (Slides) Dr. Thierry Lasserre Testing the Reactor and Gallium Anomalies with intense (anti)neutrino emitters Several observed anomalies in neutrino oscillation data can be explained by a hypothetical fourth neutrino separated from the three standard neutrinos by a squared mass difference of more than 0.1 eV$∧2$. We will discus in detail both the gallium and reactor antineutrino anomalies. We'll first discuss the way to address the anomaly with Nucifer, a very short baseline antineutrino experiment at the Osiris reactor in Saclay. We will then discuss the CeLAND experiment aiming at testing both anomalies on a short time-scale with a 50 kCi antineutrino $\beta$-source ($∧{144}$Ce) deployed in/next to the KamLAND large low background liquid scintillator detector. Host: Camillo Mariani November 2012 Nov 7 (Wed)4:00pm - 5:30pm304 Robeson Nov 14 (Wed)4:00pm - 5:30pm304 Robeson Nov 21 (Wed)4:00pm - 5:30pm304 Robeson Thanksgiving Break Nov 28 (Wed)4:00pm - 5:30pm304 Robeson (Poster) (slides) Prof. Brian Humensky Particle Astrophysics with VERITAS and CTA Ground-based gamma-ray astronomy has blossomed in the last decade, and now well over 100 sources have been studied in the TeV range. Gamma rays have wide applicability to astrophysical and cosmological problems, and in this talk I will focus on gamma-ray studies focused on the origin of cosmic rays and indirect detection of dark matter. I will focus on recent results from VERITAS (located in southern Arizona) as well as the status and scientific prospects of the Cherenkov Telescope Array, a next-generation observatory currently in its preparatory phase Host: Camillo Mariani December 2012 Dec 5 (Wed)4:00pm - 5:30pm304 Robeson (Poster) (Slides[7MB]) Dr. Jorge Morfin (Fermilab) The MINERvA Experiment: A Study of Neutrino-Nucleus Scattering Physics In this seminar we will discuss the physics of a lower-energy neutrino interacting with a medium/high-A nuclear target. The interesting aspects of axial-vector nucleus interactions as well as the various nuclear effects that must be considered will be highlighted. The MINERvA experiment, designed to study these interactions, will be described, first results presented and the path forward defined. Host: Camillo Mariani Dec 12 (Wed)4:00pm - 5:30pm304 Robeson (Poster) Dr. Omar Benhar Neutrino Cross-Section and FSI The electroweak nuclear response in quasielastic regime Omar Benhar INFN and Department of Physics "Sapienza" Universita` di Roma I-00185 Roma - Italy Over the past two decades, the availability of a large body of electron-nucleus scattering data of unprecedented accuracy has triggered the development of highly refined theoretical approaches, based on realistic descriptions of both nuclear structure and the nuclear electromagnetic current, which have proved remarkably successful in explaining the experimental results. The extension of these approaches to the study of neutrino-nucleus interactions is needed to clarify a number of outstanding issues in both neutrino physics and astrophysics. I will discuss the results of recent work aimed at developing a unified description of neutrino-nucleus interactions in the kinematical region corresponding to neutrino energies up to few GeV, relevant to long-baseline neutrino oscillation experiments, in which quasielastic scattering is expected to be the dominant reaction mechanism. Host: Camillo Mariani Dec 19 (Wed)4:00pm - 5:30pm304 Robeson Final Exam Week Dec 26 (Wed)4:00pm - 5:30pm304 Robeson Winter Break January 2013 Jan 2 (Wed)4:00pm - 5:30pm304 Robeson Winter Break Jan 9 (Wed)4:00pm - 5:30pm304 Robeson Winter Break Jan 16 (Wed)4:00pm - 5:30pm304 Robeson Winter Break Jan 23 (Wed)4:00pm - 5:30pm304 Robeson (Poster) (slides) Chiu Man Ho-Vanderbilt Univeristy Sterile Neutrinos and Light Dark Matter Save Each Other Short baseline neutrino experiments such as LSND and MiniBooNE seem to suggest the existence of light sterile neutrinos. Meanwhile, current cosmic microwave background (CMB) and big bang nucleosynthesis (BBN) measurements place an upper bound on the effective number of light neutrinos, $N_{eff}$ and the PLANCK satellite will measure $N_{eff}$ to a much higher accuracy and further constrain the number of sterile neutrinos allowed. We demonstrate that if an MeV dark matter particle couples more strongly to electrons and/or photons than to neutrinos, then p-wave annihilation after neutrino decoupling can reduce the value of $N_{eff}$ inferred from BBN and PLANCK. This mechanism can accommodate two eV sterile neutrinos even if PLANCK observes $N_{eff}$ as low as the standard model theoretical value of 3.046, and a large neutrino asymmetry is not needed to obtain the correct primordial element abundances. Dark matter with an electric dipole moment or anapole moment is a natural candidate that exhibits the desired properties for this mechanism. Coincidentally, a dark matter particle with these properties and lighter than 3 MeV is precisely one that can explain the 511 keV gamma-ray line observed by INTEGRAL. We show that the addition of two eV sterile neutrinos allows this kind of dark matter to be lighter than 3 MeV, which is otherwise ruled out by the CMB bound on $N_{eff}$ if only active neutrinos are considered. Host: Djordje Minic Jan 30 (Wed)4:00pm - 5:30pm304 Robeson (Poster) Chun-min Jen-Syracuse University An overview of electroweak scattering experiments - First leptonic probe of neutron radii of Lead Over the past decade, both of the HAPPEX and PREx collaborations have carried out various high-precision polarized elastic electron scattering experiments to explore the nuclear structure, the nucleon form factor and the weak charge of the electron through the technique of the parity-violating asymmetry measurement with limited theoretical uncertainties. Likewise, neutrino-nucleon scattering experiments can provide complementary measurements of Moller, HAPPEX and PREx. In my talk, I will give an overview of electroweak scattering experiments used to study important issues as listed above at low energy. In addition, the first electroweak observation of neutron radii of Lead and its implications for nuclear structure and astrophysics will be discussed in great details. Host: Camillo Mariani February 2013 Feb 6 (Wed)4:00pm - 5:30pm304 Robeson (Poster) Ivan Koralt- Old Dominion University Measurement of the transverse single spin asymmetry AN in polarized elastic pp collisions in the CNI region at STAR We report a high precision measurement of the transverse single spin asymmetry AN in polarized elastic proton-proton scattering in 0:003  jtj  0:035GeV2=c2 range and at the Center of Mass energy p s = 200GeV performed by the STAR collaboration at RHIC. In this range of jtj and p s energy, AN arises from the interference between electromagnetic (Coulomb) spin- ip and hadronic (nuclear) non- ip amplitudes and is also a sensi- tive probe of the hadronic spin- ip amplitude, so called Coulomb Nu- clear Interference (CNI). The reported measured values of AN and it's t-dependence were extracted from the sample of about 20 million elastic events recorded with Roman Pots of the Physics with Tagged Forward Protons Program with the STAR Detector. The results reported here are in agreement with hypothesis of no hadronic spin- ip contribution to the elastic proton-proton scattering at this high energy, which as a con- sequence, leads to a significant constraint of the theoretical models that require hadronic spin- ip. Host: Camillo Mariani Feb 13 (Wed)4:00pm - 5:30pm304 Robeson (Poster) Leonidas Kalousis-Virginia Tech New Double Chooz results Double Chooz is a reactor experiment designed to observe the signature of neutrino oscillations driven by the leptonic mixing angle Θ13. In the past, similar, single detector experiments put tight constraints on Θ13 pointing towards a small, or even exactly zero, Θ13 scenario. Double Chooz is a second generation project that utilizes two identical detectors to reduce the dominant reactor systematics and unveil the oscillation patterns driven by Θ13 in the atmospheric square-mass splitting, Δm2atm. Double Chooz has started stable data taking with a single, far detector since April 2011. In this seminar we shall give a detailed overview of the concept and the status of the experiment. Emphasis will be given on a measurement of Θ13 based on neutron captures on hydrogen. Finally, perspectives and next steps of this quest will also be reviewed. Feb 20 (Wed)4:00pm - 5:30pm304 Robeson Feb 27 (Wed)3:00pm - 4:00pm304 Robeson (Poster) (slides) Brian Rebel-Fermilab Liquid Argon Detectors at Fermilab: From R&D to Results Liquid argon time projection chambers (LArTPCs) are an exciting new technology for neutrino detectors. This technology provides excellent position resolution that rivals bubble chamber images, but in a digital format. The striking advantage of liquid argon time projection chambers for neutrino physics is the ability to distinguish between electrons, produced in charged current interactions, and gammas, produced by the decay of neutral pions created in neutral current interactions, with high efficiency. This talk will outline the Fermilab R&D program aimed toward development of a multi-kiloton scale detector for long baseline neutrino physics. Results from the various aspects of the program will be presented, as well as the status of future experiments that will use LArTPCs. Host: Camillo Mariani March 2013 March 6 (Wed)4:00pm - 5:30pm304 Robeson March 13 (Wed)4:00pm - 5:30pm304 Robeson Spring Break March 20 (Wed)4:00pm - 5:30pm304 Robeson (Poster) (slides) Jong Hee Yoo Coherent Elastic Neutrino Nucleus Scattering: CENNS Looking deep into the night sky, there are countless stars, myriad shapes of gas clouds, pulsars, supernovae, and galaxies. However, it is now proven that the Universe is mostly filled with what we cannot see; neutrinos and dark matter. Massive neutrinos and dark matter lead to profound consequences for the evolution of the Universe. The two are similar in many ways as they both exist everywhere and interact weakly. Indeed, all major direct detection experiments for dark matter searches rely on the postulation of coherent scattering off of nuclei by cold dark matter when scaling their detector sensitivities, which enhances the total interaction cross-section by the atomic mass squared of the target material. This is an analogy of the coherent elastic (neutral current) neutrino-nucleus scattering (CENNS). The CENNS, however, has yet to be observed since its first theoretical prediction in 1974. Technical difficulties of developing a large-scale, low-energy threshold and low-background detector have hampered the experimental realization of the CENNS measurement for four decades. However, recent innovations in dark matter detector technology have made the unseen CENNS testable. In this talk I will cover a recent R&D effort in measuring the CENNS at Fermilab. Host: Camillo Mariani March 27 (Wed)4:00pm - 5:30pm304 Robeson (Poster) Scott Ransom (University of Virginia) Basic (but cool!) Physics with Millisecond Pulsars There are about 2000 pulsars known, and while all of them as neutron stars are fascinating objects, the best and most exciting science comes from a very small percentage (~1%) of exotic objects, most of which are millisecond pulsars (MSPs). These systems are notoriously hard to detect, yet their numbers have more than doubled in the past 5-6 years via surveys using the world's largest radio telescopes and the Fermi Gamma-ray Space Telescope. Timing observations of these new MSPs as well as much improved monitoring of previously known MSPs are providing a wealth of science. In this talk I will discuss why pulsar observations are in the middle of a renaissance period, touch on some of the astrophysics they are providing, as well as two important bits of basic physics: the nature of matter at supra-nuclear densities (including the recent accurate measurement of a two Solar mass neutron star), and the direct detection of gravitational waves (e.g. NANOGrav) likely within the next decade. Host:Nahum Arav April 2013 April 3 (Wed)4:00pm - 5:30pm304 Robeson (Poster) (slides) Xiaolong Wang- Virginia Tech Ten years of the experiments on XYZ particles The past ten years is a great period of quarkonium and quarkonium-like states. Starting from the exotic X(3872) at Belle, a long list of new states were discovered and established at BaBar, Belle, CLEO-c, etc, and they are called XYZ particles since most of them are hard to explained by theory currently. The width of X(3872) is as narrow as psi(2S), even it's well above the DDbar threshold. The Y(4260), Y(4360) and Y(4660) were well studied via Initial State Radiation scan, and their J^{PC} is well established to be 1^{--}. They are vector charmonium-like states. A X(3915) states was established in photon-photon collision, so that it's a candidate of C-even charmonium(-like) state. A similar bottomonium-like state (Y_b) was found near Upsilon(5S). Meanwhile, there are many structures found in the combinations with a quarkonium and a charged pion, like Z(4430), Z_b(10610), Z_b(10650), and the recent Z_c found in Y(4260) decay. They are very good candidates of states with five quarks. The exotic XYZ particles bring in many puzzles, which are calling more studies via both experiment and theory. April 10 (Wed)4:00pm - 5:30pm304 Robeson (Poster) (slides) Pilar Coloma (Virginia Tech) Implications of a large $\theta_{13}$ on long baseline neutrino oscillation experiments The primary goals of present and forthcoming neutrino beam experiments are to establish whether there is CP violation in the leptonic sector and to determine the neutrino mass hierarchy. The large value of $\theta_{13}$ recently discovered has opened the possibility to determine the mass hierarchy in the near future, but the situation is very different for CP violation. I will give a general overview of the physics reach of the main neutrino facilities proposed in the literature for these two observables. Eventually, a precise measurement of the CP-violating phase $\delta$ will also be desirable at any neutrino beam experiment. I will also discuss what are the main factors that will limit the achievable precision for this parameter. April 17 (Wed)4:00pm - 5:30pm304 Robeson (Poster) Szymon Manecki-Virginia Tech Solar- , Anti- and Sterile- ? Measurements with the Borexino Detector: Recent Results and Upcoming Plans The Borexino detector was originally designed for a precision measurement of the 7Be, monochromatic line of the solar neutrino spectrum. The goal was soon achieved with a remarkable uncertainty of below 5%, a result that was later followed by the measurements of day-night asymmetry and annual modulation of these low-energy neutrinos. In addition, thanks to unprecedented levels of internal backgrounds, it was possible to detect the rare geo-(anti)neutrinos for the first time. With the upcoming plans, Borexino will soon deliver new insight on non-active neutrinos, the so-called sterile-neutrinos, the existence of which has been hinted by such experiment as LSND, and Gallex. In the following talk, I will review the unique versatility of the Borexino detector to different neutrino families. I will present some of the most recent results from the measurements of solar neutrinos, the annual modulation, and the first un-ambiguous detection of geo-neutrinos. I will conclude by summarizing the status of R&D for the sterile-neutrino SOX plans, the Short Distance Neutrino Oscillations with Borexino. April 24 (Wed)4:00pm - 5:30pm304 Robeson May 2012 May 1 (Wed)4:00pm - 5:30pm304 Robeson (Poster) Ufuk Aydemir-Virginia Tech The Higgs mass and the emergence of new physics at the TeV scale I will discuss the physical implications of formulating the electroweak part of the Standard Model in terms of the supergroup formalism, involving the supergroup SU(2/1). In particular I will argue that the observed Higgs mass is related to the new physics beyond the Standard Model at around 4 TeV which is associated with the emergent supergroup SU(2/2). The ultraviolet incompleteness of the supergroup approach points to its emergent nature. The new physics in this context is basically so called left-right symmetric model, which is natural from the point of view of the Pati-Salam theory. Given the fact that the Pati-Salam group is robust in certain constructions of string vacua, I will argue that these results point to a deeper connection of the low energy (4 TeV) --which is within the energy range of LHC-- and the high energy (Planck scale) physics, via the violation of decoupling in the Higgs sector. May 8 (Wed)4:00pm - 5:30pm304 Robeson (Poster) Derek Rountree Large Scale Antineutrino Detectors and Far-Field Reactor Monitoring via Antineutrinos Being Developed at KURF The production of neutrons and radionuclides by cosmogenic secondaries is poorly understood at medium depth overburdens (a few 100 m.w.e.). The Watchman collaboration has undertaken a series of measurements at the Kimballton Underground Research Facility (KURF) to characterize these cosmogenically induced backgrounds. Radionuclide production will be measured using a shielded one ton Gd-H2O detector at ~350 m.w.e. depth, while fast neutrons will be measured as a function of depth using a mobile neutron multiplicity spectrometer (a detector comprised of lead sandwiched between plastic scintillator Gd doped paint detectors). Understanding these backgrounds is essential to the designing of future moderate depth large scale (100+ kiloton) Cherenkov and scintillation detectors, and to determining the feasibility of remote detection and monitoring of small rectors. May 15 (Wed)304 Robeson (Poster) Last day of exams Yury Kolomensky Neutrinoless Double Beta Decay with Bolometric Detectors The nature of the neutrino and the scale of its absolute mass are two of the pressing fundamental questions in particle physics. Searches for neutrinoless double beta decay (0nuDBD) is the only known practical way to determine whether the neutrinos are Dirac or Majorana fermions. Observation of 0nuDBD would be an unambiguous sign of physics beyond the Standard Model, would signal that the lepton number is not a conserved quantity, and could indicate the absolute scale of the neutrino masses. Several experiments currently underway or in construction phase are searching for 0nuDBD with a neutrino mass sensitivity in the so-called inverted or degenerate mass hierarchy ranges. I will discuss the high-resolution bolometric experiments, and in particular CUORE, which will search for 0nuDBD in Te-130. I will also discuss prospects for improving the sensitivity of the current experiments to the 10-20 meV range, which would explore the entire inverted hierarchy region. Host:Camillo Mariani May 22 (Wed)304 Robeson Summer Break May 29 (Wed)304 Robeson Summer Break