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In the Standard Model helical magnetic and hypermagnetic fields are coupled to lepton and baryon number and to the chiral asymmetry of charge carriers. As a consequence, there is a potentially strong connection between the evolution of primordial magnetic fields and the creation of lepton and baryon number. In this presentation we discuss how helical primordial fields evolve in the primordial plasma, in particular during the electroweak phase transition, and how this could connect to baryo- and leptogenesis.
The Lepton number violating process of neutrinoless double beta decay is the only known viable way of determining whether or not neutrinos are Majorana particles. Detection of the decay would be the first proof of Lepton number violation and the Majorana character of neutrinos. It would give strong motivation to theories explaining the Baryon asymmetry of the universe based on Leptogenesis. Additionally, information on neutrino masses could be obtained.
The GERDA experiment and its first results will be discussed in some detail. Plans for future experiment based on the technologies developed for the current generation germanium based experiments will be give. The sensitivities aimed for with next generation experiments will be discussed in context of physics motivation and technological feasability.
Neutrinoless double beta decay provides a viable way to test the Majorana nature of neutrino mass, and measure neutrino mass. This lepton number non-conserving process represents an exciting prospect of BSM physics that could carry key information of mechanisms explaining the matter dominance in the universe.
The best sensitivity for this decay is currently held by experiments using Xenon-136. The EXO-200 and Kamland-Zen recent results will be reviewed, and the status and physics reach of future tonne-scale experiments illustrated. The technological challenges of these experiements will be outlined in the context of the broader portfolio of experiments searching for neutrinoless double beta decay.
I will review the status and prospects of lepton flavor violation physics,
discussing both low-energy probes (charged lepton decays) and high-energy
probes (Higgs decays).
Over the past years the description of leptogenesis
has been more and more refined and put on a solid
basis. In this talk I will review some of the developments
as well as some more recent scenarios for realizing
leptogenesis.
A Lepton Flavour Violation (LFV) among charged leptons, e.g. $\mu \rightarrow e \gamma$ (mu-e-gamma), $\mu N \rightarrow e N$ (mu-e conversion) etc, which has never been observed while the quark mixing and the neutrino oscillations have been experimentally confirmed, is attracting a great deal of attention, since its observation is highly expected by most of well-motivated theories beyond the Standard Model, such as SUSY-GUT, seesaw, little-Higgs, etc.
Since the high power muon source is available at PSI and J-PARC recently, precise measurement of muon decay is most promising to search for the charged LFV.
In this presentation, the latest and final result of MEG experiment which is the present upper limit will be given in detail.
In addition, some experimental prospects will be presented to search for several muon LFV process such as MEG-II to explore mu-e-gamma one order more, and COMET/mu2e to search for mu-e conversion four orders more, and so on.
The extension of the Standard Model by heavy right handed neutrinos can simultaneously explain the observed neutrino masses via the seesaw mechanism and the baryon asymmetry of the universe via leptogenesis. If the mass of the heavy neutrinos is at or below the TeV scale, they can be found in collider or fixed target experiments. We derive predictions for the properties of heavy neutrinos from the requirement to explain the observed baryon asymmetry of the universe. If any heavy neutral leptons are found in future experiments, our predictions can be used as a criterion to assess whether these new particles can be responsible for the origin of matter in the universe.
Searches for the permanent electric dipole moments of atoms,
nucleons, and nuclei provide one of the most powerful probes of
CP-violation beyond the Standard Model. In this talk, I survey the
opportunities for discovering BSM CP-violation with the present and next
generation EDM searches; discuss the complementary of searches using
different systems; and highlight the implications of these searches
for explaining the origin of the cosmic matter-antimatter asymmetry.
In this talk I will discuss recent work to enhance the precision of future experiments to search for the electric dipole moment (EDM) of the neutron. Next to enhanced techniques, which also have impact on other future large-scale experiments like the proton-EDM search, also a potential new class of systematic effects for future experiments will be presented. In the second part of my talk I will focus on the preparation of the neutron EDM and its spin-offs at TU München. The new combination of the experiment with the the Super-SUN UCN source at ILL, which will be the location of the experiment in the next years, will be shown. The new perspectives and sensitivity estimates for the neutron EDM measurement at ILL will be discussed for the first time.
CP violation may lead to an EDM of an atom through multiple sources involving the electron-nucleus interaction and through interactions within the nucleus. In diatomic systems - with no unpaired electron spin - the lowest order nuclear observable is the “Shiff Moment,” which is probed by atomic electrons crossing the nucleus. Thus generally heavier atoms with a larger nucleus and stronger gradient of the electron wave function across the nucleus are more sensitive. Additionally, collective effects and octupole collectivity can lead to enhanced Schiff moments is specific nuclei. These observations and advances in techniques provide for a set of new experiments underway that promise to advance our knowledge of CP violating sources even beyond what can be learned from the stunning result in 199-Hg. In this talk I will discuss recent and future experimental efforts prospects.
Recent anomalies in B Decays identified in the last years by Belle, BaBar, LHCb, CMS and ATLAS indicate the presence of new physics beyond the Standard Model but none of them points towards new sources of CP-violation. On the contrary the recently improved estimates of CP-violation in K_L-> pi pi decays (epsilon'/epsilon) give a strong indication for the presence of new sources of CP violation beyond the Cabibbo-Kobayashi-Maskawa framework. Moreover, some tensions between B_s,d0 - B_s,d^0 mixing and CP-violation in K^0 - K_bar^0 mixing (epsilon_K) seem to emerge. The talk discusses these new anomalies and their implications for the rare decays K^+ -> pi^+ nu nu_bar and K_L -> pi^0 nu nu_bar as well as correlations of with some of the anomalies hinted by B-decays.
The Babar, Belle, and LHCb experiments have provided precise measurements of the level of CP violation in the quark sector, confirming SM predictions for B decays. I will review recent highlight measurements of direct and time-dependent CP asymmetries in B decays, and related measurements that would indicate new phenomena. I will also discuss the prospects of the Belle II experiment at the new SuperKEKB intensity frontier collider to find new sources of CP violation, due to commence data taking in 2017.
The SuperKEKB electron-positron collider at KEK (Japan) will provide an almost two orders of magnitude higher instantaneous luminosity compared to the world record B-factory KEKB.
We give a short introduction into the physics of SuperKEKB, summarize the main findings of the previous generation of B-factories and present the potential of SuperKEKB for searches of physics beyond the Standard Model. We then focus on the status of the machine, which is about to successfully complete its first phase with circulating beams. Concurrently with the construction of SuperKEKB, a massive detector upgrade (``Belle II'') is carried out as well. In particular, the tracking and vertexing detectors will be replaced. We also report on the design and construction of a novel silicon pixel vertex detector for Belle II, which is carried out within an international collaboration, with strong participation of the Excellence Cluster. Finally, we show some examples of the expected performance of this unique vertex detector, and describe the commissioning plans for this detector, with a first installation of a "commissioning" vertex detector into Belle II already during the spring of next year.
Long-baseline neutrino experiments are prime candidates to search for CP violation in the lepton sector via neutrino oscillation. I will describe how long-baseline experiments can measure CP violation and will review the current status of the measurements. I will also present the future long-baseline experiments and discuss their prospects to discover CP violation.
In various extensions of the Standard Model it is possible that the electroweak phase transition was first order. This would have been a violent process, involving the formation of bubbles and associated shock waves. The collision of these bubbles and shock waves could be a detectable source of gravitational waves. I will summarise the current status of efforts to model the such a phase transition based on large-scale hydrodynamical simulations. From the nucleation of bubbles through to the onset of turbulence, I will discuss the processes involved, the dependence upon particular models, and the implications for detectability of the resulting gravitational wave power spectrum.
Within the context of the nuMSM, massive sterile neutrinos in the MeV-GeV range could explain both the neutrino masses and baryogenesis.
Sterile Majorana neutrinos of such kind can be searched for with various experiments with particle accelerators, both in collider and fixed target mode.
The talk will review limits from past and present experiments and give an outlook for future runs of approved and proposed experiments and put the int the context of the above mentioned model.
In particular the SHiP proposal at CERN/SPS will also be discussed in detail.
Neutron-antineutron oscillations can occur if baryon number is violated by 2 units. We will describe the prospects for improvements in laboratory searches for n-nbar oscillations using underground detectors and free neutron beams. We will outline a specific experiment for the European Spallation Source which can improve present limits for the probability of n-nbar oscillations with free neutrons by three orders of magnitude.