Satellite workshop on symmetries in light and heavy flavour

7 Nov 2016, 08:00 → 8 Nov 2016, 18:00 Europe/Berlin

Room 401 (Max Planck Institute for Astrophysics (MPA))

Bastian Märkisch (TUM), Hartmut Abele (TUM), Peter Fierlinger (TU München), Stephan Paul (TU-München), Stephanie Hansmann-Menzemer (Physikalisches Institut, Universität Heidelberg), Ulrich Uwer (Physikalisches Institut, Universität Heidelberg)

In the framework of the MIAPP program “Flavour Physics with High Luminosity Experiments”, held Oct. 24th – Nov. 18th in Munich, we intend to organize a satellite-workshop, with the aim to link the physics of high precision symmetry tests in the light and heavy quark sector.

The LHC and the upcoming Belle-2 experiment offer unprecedented exploratory potential using decays of B and D mesons. Parity, time-reversal violation and CP violation provide insight to the physics at smallest distance scales governed by new heavy particles and/or interactions. The same scales can be probed by next generation precision neutron experiments, exploring the Lorentz-structure in neutron beta-decay, searching for a neutron EDM or probing the charge of the neutron. 
 
The workshop aims to understand the synergies as well as the complementarity of both approaches, the precision tests of heavy meson decay and the precision neutron measurements, for the search of beyond the Standard Model physics (BSM). The work-shop should pave the way for a consistent common analysis and interpretation of neutron and heavy meson data.    
  
We intend to join experimentalists from neutron and heavy meson physics from Vienna, Munich and Heidelberg with the interested theoreticians in the two fields. The emphasis should be on links, common interpretation and the evaluation of the relevance of future precision measurements in the light of the prospective sensitivities to discover or constraint BSM physics in the coming decade.

Monday 7 November

10:00 Preliminary programme. Please check on Indico.

Welcome

Session 1

1 Welcome / Introduction

2 Properties of bound electrons and muons

The mass of the electron is best determined with hydrogen-like ions in a Penning trap. Binding in an ion removes the error due to the thermal motion of the electron. However, the price is that some properties of the electron are modified by the binding. These changes can be computed in QED but there are interesting complications. We present recent progress in the determination of the g-factor of a bound electron. This calculation is motivated by the 2014 improvement in the mass of the electron and makes further experimental progress possible. We also report an improved determination of the electron spectrum in the decay of a bound muon. This study is motivated by the upcoming experiments Mu2e (Fermilab) and COMET (J-PARC) that will search for the exotic muon-electron conversion, in an effort to discover the non-conservation of the charged lepton flavor. High-energy electrons produced in the ordinary decays of muons are a background in these searches. In these experiments muons are stopped in an aluminium target. Thus, we have determined the modification of the decay spectrum by the Coulomb field of a Z=13 nucleus.

Speaker: Andrzej Czarnecki (U. Alberta)

Slides Czarnecki_-_Properties_of_bound_electrons_and_muons.pdf

12:30 Lunch

Session 2

3 Probing Gravity with Ultracold Neutrons in the qBounce Experiment

The qBounce experiment will be presented: ultracold neutrons fall in the gravity potential of the earth and are re ected from a mirror. As a bound quantum system, the neutrons have discrete energy eigenstates and are found in a coherent superposition of particular levels. The lowest discrete states are in the range of several pico-eVs. This opens the way to probe theories of gravitational interaction and dark energy.

Speaker: Dr Mario Pitschmann (TU Wien)

Slides Pitschmann_-_Probing_Gravity_with_Ultracold_Neutrons.pdf

4 Correlations in neutron beta decay

In the upcoming years next generation experiments on neutron beta decay will provide an increased sensitivity by an order of magnitude or more and will allow to asses previously inaccessible observables. In this talk I will present an overview on observables in neutron beta decay and the measurement principles used. In particular the reach of the new instrument PERC, which is currently under construction at the MLZ / FRM II in Garching, will be discussed.

Speaker: Prof. Bastian Märkisch (TUM)

Slides Märkisch_-_Neutron_Decay_Correlations.pdf

5 Model-independent analyses of charged-current (semi)leptonic quark decays

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Speaker: Martín González-Alonso (Lyon Institute of Origins, Institut de Physique Nucléaire de Lyon)

Slides Gonzalez-Alonso_-_Model-independent_analyses_of_CC_semileptonic_quark_decays.pdf

15:30 Coffee

Session 3

6 Precision Analysis of Electron Energy Spectrum and Angular Distribution of Neutron Beta-Decay with Polarized Neutron and Electron

We give a precision analysis of the correlation coefficients of the electron-energy spectrum and angular distribution of the Beta-decay and radiative Beta-decay of the neutron with polarized neutron and electron to order 10^(-3). The calculation of correlation coefficients is carried out within the Standard model with the contributions of order 10^(-3), caused by the ``weak magnetism'' and proton recoil, taken to next-to-leading order in the large proton mass expansion, and the radiative corrections of order "alpha/\pi ~ 10^(-3)", calculated to leading order in the large proton mass expansion. The obtained results can be used for the planning of experiments on the search for contributions of order 10^(-4) of interactions beyond the Standard model. The talk is based on the results, obtained in Phys.Rev. D88, 073002 (2013) and Phys.Rev. D88, 065026(2013). It is supported by the Austrian ``Fonds zur Förderung der Wissenschaftlichen Forschung'' (FWF) under contracts I689-N16, I862-N20 and P26781-N20 and by the ÖAW within the New Frontiers Groups Programme, NFP 2013/09.

Speaker: Prof. Andrey Ivanov (Atominstitut TU Wien)

7 Symmetry tests with tau lepton

Speaker: Dr Simon Eidelman (Budker Institute of Nuclear Physics)

Slides Eidelmam_-_Symmetry_Tests_with_τ_Lepton.pdf

8 New Physics Searches with Flavor, Both Heavy and Light

I offer a snapshot summary of the new physics searches possible via precision measurements of heavy meson and neutron decays, emphasizing probes of the violation of discrete symmetries. In some cases the tests in systems of light and heavy flavor are complementary, in others they are disjunct. I consider examples of each class, noting the broader complementary of such work with other experiments in low and high energy physics.

Speaker: Susan Gardner (University of Kentucky)

Slides Gardner_-_New_Physics_Searches_with_Flavor,_Both_Heavy_&_Light.pdf

19:30 Dinner

Note that the dinner will take place downtown Munich!

Tuesday 8 November

Session 4

9 Model-independent analyses of new physics in precision experiments

Effective field theory methods allow to analyze the impact of physics beyond the Standard Model on precision observables in low-energy experiments, e.g. flavour physics, in a model-independent way and also allow to correlate effects in different types of experiments. I will discuss the general framework and some examples of current interest, e.g. concerning tensions between B decay measurements and Standard Model expectations.

Speaker: David Straub (TUM)

Slides Straub_-_New_physics_from_B_mesons_to_neutrons.pdf

10 EFT-methods and correlations between various flavor sectors

Given a particular UV completion beyond the SM, flavor constraints from various low-energy flavor observables can provide combined powerful constraints on the new physics parameter space, depending on the model at hand. But even with EFT-methods, correlations between various flavor sectors exist due to operator mixing. A particular example from the literature (arXiv:1605.00524) will be discussed in order to illustrate this in the context of current b->s ll anomalies and how they imply also modifications of other sectors such as purely leptonic decays.

Speaker: Dr Christoph Bobeth (TUM)

Slides Bobeth_-_SMEFT.pdf

10:30 Coffee

Session 5

11 Testing CPT symmetry with (anti-)hydrogen

The CPT symmetry is one of the cornerstones of the Standard Model of Particle Physics. It's consequence that properties of particles and antiparticles are either exactly equal or exctly opposite is being tested using antihydrogen spectroscopy at the Antiproton Decelerator of CERN. The ASACUSA collaboration is pursuing a meansurement of the ground-state hyperfine splitting GS-HFS of antihydrogen in a cold atomc beam, which offers one of the most sensitive tests of CPT symmetry. Using a polarized hydrogen beam measurements of one of the microwave transitions within the GS-HFS have been performed at the ppb level, and measurements of a second transition are under way. These results can be used to constrain some of the coefficients of the SME model of Alan Kostelecky (Indiana).

Speaker: Prof. Eberhard WIDMANN (Stefan Meyer Institute)

Slides Widmann-(Anti)hydrogenHFS-München2016.pdf

12 Connections between Rare decays, mixing, LHCb and Belle 2

Speaker: Sebastian Jaeger (TUM)

Slides Jaeger_-_Connections_between_rare_B_decay,_LHCb,_and_Belle.pdf

13 Enhanced Light Fermion Yukawa couplings

Speaker: Martin Bauer (Universität Heidelberg)

12:30 Lunch

Discussion: Discussion about future joint research program