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Colloquium Prague ν15

J. Heyrovsky Institute of Physical Chemistry

J. Heyrovsky Institute of Physical Chemistry

Dolejškova 2155/3, 182 23 Prague 8, Czech Republic

Colloquium Towards CP violation in neutrino Physics

The aim of the Colloquium is to present a status and plans for CP violation measurement in neutrino experiments.  It plans to provide an overview of recent experimental results, theoretical predictions, experiments under construction and planned experiments to measure CP violation in lepton sector.
It consists of invited talks.

Rutherford Appleton Laboratory University of Oxford Charles University, Prague
  Institute of Physics, Prague  

The organizing committee:

David Wark, Oxford University/Rutherford Appleton Laboratory
Debbie Loader, Rutherford Appleton Laboratory
Rupert Leitner, Charles University, Prague
Vit Vorobel, Charles University, Prague
Milos Lokajicek, Institute of Physics AS CR, Prague
Nina Tumova, Institute of Physics AS CR, Prague

  • Adam Smetana
  • Aivaras Žukauskas
  • Alain Blondel
  • Alexander Kupco
  • Andrej Babic
  • Andrej Kugler
  • Bedrich Roskovec
  • Benedikt Bergmann
  • Dagmar Adamova
  • David Kloz
  • David Wark
  • Drahos Venos
  • Ekaterina Rukhadze
  • En-Chuan Huang
  • Fedor Simkovic
  • Filip Jediny
  • Gioacchino Ranucci
  • Ivan Štekl
  • Jakub Vlášek
  • Jan Fischer
  • Jan Smolik
  • Jana Sentkerestiová
  • Jiri Hejbal
  • Jiri Kroll
  • Jiri Prochazka
  • Jiří Chýla
  • Jiří Formánek
  • Jiří Hošek
  • Karel Soustruznik
  • Karin Gilje
  • Karla Denaly Palma Alejandro
  • Lukas Fiala
  • Lukáš Fajt
  • Marcela Mikestikova
  • Marek Tasevsky
  • Marianne Göger-Neff
  • Mark Thomson
  • Martin Dvořák
  • Martin Hejtmanek
  • Martina Bohacova
  • Marzio Nessi
  • Michal Malinsky
  • Michal Svatos
  • Milos Lokajicek
  • Miloš V. Lokajíček, sen.
  • Miroslav Macko
  • Mária Špavorová
  • Nina Tumova
  • Ondřej Svoboda
  • Ondřej Šrámek
  • Otokar Dragoun
  • Peter Shanahan
  • Petr Bouř
  • Petr Tas
  • Petr Travnicek
  • Petr Závada
  • Roman Lysak
  • Rupert Leitner
  • Soo-Bong Kim
  • Tomas Davidek
  • Tomas Nosek
  • Tord Ekelof
  • Vaclav Vrba
  • Viktor Pec
  • Vit Vorobel
  • Vladislav Simak
  • Vojtech Kundrat
  • Zdenek Dolezal
  • Zdenek Kotek
  • Zuzana Jelínková
Secretary: Nina Tumova
  • Thursday, November 5
    • 8:00 AM
    • 1
    • 2
      Current Status of Neutrino Oscillations
      Speaker: David Wark (Oxford University / RAL)
    • 3
      First Results and Prospects of the NOvA Experiment
      Speaker: Peter Shanahan (Fermilab)
    • 4
      Theory - neutrinos and dark matter
      Speaker: Michal Malinský (Charles University (CZ))
    • 11:05 AM
      Coffee Break
    • 5
      Recent results from RENO and prospects with RENO-50
      Reactor Experiment for Neutrino Oscillation(RENO) has observed the disappearance of reactor electron antineutrinos to measure the smallest neutrino mixing angle theta13. The experiment has analyzed roughly 800 days of data to make an accurate measurement of the reactor neutrino flux and spectral shape, and has found an excess in the region of 5 MeV relative to the most commonly used model. Based on energy and baseline dependent disappearance of reactor neutrinos, we have extracted the neutrino oscillation frequency. In this talk, I will present a new measured value of theta13 and our first measurement of |Dm_ee^2|, and introduce a future experiment of RENO-50 to determine the neutrino mass ordering.
      Speaker: Soo-Bong Kim (Seoul National University)
    • 6
      Recent Results from the Daya Bay Reactor Neutrino Experiment
      The Daya Bay Reactor Neutrino Experiment is designed to precisely determine the mixing parameter theta13 via the relative measurements of antineutrino events by the eight identically designed antineutrino detectors at various baselines. The observation of non-zero theta13 is critical for the search of CP violation in neutrino physics. In this talk, I will present the latest results of the precise measurement of the parameters theta13 and |Dm^2_ee|, an independent measurement of theta13 via the neutron capture on hydrogen, the absolute measurement of the rate and energy spectrum of reactor neutrinos, and a search for sterile neutrino in the mass splitting range of 0.001 eV^2 < |Dm^2_41| < 0.3 eV^2.
      Speaker: En-Chuan Huang
    • 7
      Latest results from the Double Chooz experiment
      Double Chooz aims at a precise measurement of the neutrino mixing angle theta13 through the disappearance of reactor electron anti-neutrinos. The experiment relies on the measurement of neutrino flux and spectrum with two identical detectors at different distances from a nuclear power reactor: 1 km and 400 m from the reactor cores. Double Chooz has been running since 2011 with the far detector only, providing the first indication for non-zero theta13 with reactor neutrinos. Data taking with the near detector has finally started beginning of 2015. The talk will review the most recent results obtained with the far detector only, and discuss first data from the near detector.
      Speaker: Marianne Göger-Neff
    • 1:20 PM
      Lunch Cafeteria (Institute of Computer Science of Academy of Sciences)


      Institute of Computer Science of Academy of Sciences

    • 8
      DUNE: The Deep Underground Neutrino Experiment
      Fermilab is undertaking an ambitious program of long- and short-baseline neutrino oscillation experiments utilizing large Liquid Argon (LAr) TPC detectors. The flagship of this program is the DUNE/LBNF project, which is the highest priority of the US domestic particle physics program in the next decade. A high-power neutrino beam will be fired 1300 km from Fermilab towards a 40,000 ton LAr-TPC detector, located a mile underground at the Sanford Underground Research Facility in South Dakota. In this seminar, I will review the scientific goals of DUNE, focussing on neutrino physics and, in particular, the potential for the first definitive observation of CP violation in the leptonic sector. I will discuss the current status of the LBNF/DUNE and the recent rapid progress that has been made towards its realization as a truly international project.
      Speaker: Mark Andrew Thomson (University of Cambridge (GB))
    • 9
      T2K and Hyper Kamiokande
      Speaker: Alain Blondel (Universite de Geneve (CH))
    • 4:10 PM
      Coffee Break
    • 10
      Features and goals of the JUNO neutrino oscillation experiment
      The high, and somewhat unexpected, value of the mixing angle theta13 recently measured by Day Bay, Reno and Double Chooz makes experimentally accessible the method proposed over ten years ago by Piai and Petcov for determining the neutrino mass hierarchy through the measurement with a liquid scintillator detector, of large mass, of the spectrum of the anti-neutrinos from a high power nuclear reactor, located at medium distance (a few tens of km) from the detector itself. It is in this context that the proposal for the experiment JUNO in China, 50 km away from a dual nuclear complex under construction, has been formulated. In this talk, after the description of the physics capabilities of the experiment, which include the crucial measure of the mass hierarchy, as well as a rich astroparticle program, I will illustrate the technical characteristics of the set-up, with particular emphasis on the technological challenges which have to be addressed and resolved along the path towards the concrete assessment of the neutrino hierarchy.
      Speaker: Gioacchino Ranucci (Istituto Nazionale di Fisica Nucleare)
    • 11
      The opportunity offered by the ESSnuSB project to exploit the larger leptonic CP violation signal at the second oscillation maximum and the requirements of this project on the ESS accelerator complex
      The ESS neutrino Super Beam, ESSnuSB, operated with a 2.0 GeV linac proton beam, together with a large underground Water Cherenkov detector located at 540 km from Lund, close to the second oscillation maximum, will make it possible to discover leptonic CP violation at 5 sigma significance level in 56 percent (65 percent for an upgrade to 2.5 GeV beam energy) of the leptonic Dirac CP-violating phase range after 10 years of data taking. The paper gives an overview of the proposed facility and presents the outstanding physics reach possible for CP violation with ESSnuSB.
      Speaker: Tord Ekelöf (Uppsala University)
    • 7:30 PM
      Social Dinner
  • Friday, November 6
    • 12
      The CERN Neutrino Platform
      The CERN Neutrino Platform is CERN’s undertaking to foster and contribute to fundamental research in neutrino physics at particle accelerators worldwide, as recommended by the 2013 European Strategy for Particle Physics. It includes the provision of a facility at CERN to allow the global community of neutrino experts to develop and prototype the next generation of neutrino detectors. It includes the active participation of CERN in Neutrino Experiments worldwide. The CERN Neutrino Platform is CERN’s main contribution to a globally coordinated programme of neutrino research.
      Speaker: Marzio Nessi (CERN)
    • 13
      PROSPECT- a precision short baseline reactor antineutrino experiment
      Comparison of reactor antineutrino flux and spectrum measurements to model predictions have revealed an apparent deficit in the reactor antineutrino interaction rate and an unexpected spectral deviation. PROSPECT, the Precision Reactor Oscillation and Spectrum experiment, is designed to make a precision measurement of the antineutrino spectrum from a research reactor and search for signs of sterile neutrinos. PROSPECT will be located near the High Flux Isotope Reactor (HFIR) at the Oak Ridge National Laboratory. The Highly Enriched Uranium fuel used by HFIR will allow a measurement of the pure U-235 antineutrino spectrum providing constraints on reactor models and improving our understanding of the reactor antineutrino spectrum predictions. Additionally, the planned 2-ton 6Li-doped liquid scintillator detector is ideally suited to perform a search for sterile neutrinos on the eV-scale. This talk will focus on the sensitivity and discovery potential of PROSPECT and describe the current R&D efforts and the detector design needed to achieve these goals.
      Speaker: Karin Gilje (Illinois Institute of Technology)
    • 14
      Beta-spectroscopic constraints on neutrino masses and status of KATRIN
      Precision measurements of the endpoint region of tritium beta-spectrum have provided the best upper limit of the effective mass of the electron antineutrino. The advantages and drawbacks of this kinematic, an almost model independent, method will be reviewed. The status of the KATRIN experiment aiming at ten times higher sensitivity will be described. Several new approaches will be outlined.
      Speaker: Otokar Dragoun
    • 10:40 AM
      Coffe Break
    • 15
      Theory and Phenomenology of the 0nbb-decay
      Speaker: Fedor Šimkovic (Comenius University)
    • 16
      Double beta decay
      Experimental searches for neutrino-less double beta decay (0v beta beta) are one of the most active research topics in neutrino physics. The observation of such process is in fact of major importance since it will prove the Majorana nature of neutrinos and may give access to their absolute mass scale. The Majorana nature of the neutrino would have interesting implication in many extensions of the Standard Model of particle physics. On the other hand, two neutrino double beta decay (2v beta beta) provides needed information for further development of nuclear theory (nuclear matrix elements). During the talk, the subjects of 0v beta beta and 2v beta beta decays, the most important experiments in the field and the obtained results will be introduced.
      Speaker: Ivan Štekl (Czech Technical University in Prague)
    • 17
      Future Neutrino oscillation experiments - Round Table Discussion
    • 12:45 PM
      Lunch, Farewell Cafeteria (Institute of Computer Science of Academy of Sciences)


      Institute of Computer Science of Academy of Sciences