Conveners
Tests of symmetries and conservation laws
- Chloé Malbrunot (CERN)
Tests of symmetries and conservation laws
- Claude Amsler
Tests of symmetries and conservation laws
- Chloé Malbrunot (CERN)
Tests of symmetries and conservation laws
- Krishna Kumar (University of Massachusetts, Amherst)
Mr
Alexander Wunderle
(Johannes Gutenberg Universität Mainz)
25/08/2014, 14:00
9) Tests of symmetries and conservation laws
Talk
The aSPECT retardation spectrometer measures the electron antineutrino angular correlation coefficient a in free neutron beta decay. This measurement can be used to determine the ratio of g_A/g_V of the weak coupling constants, as well as to search for physics beyond the Standard Model.
In spring/summer 2013 aSPECT had a successful beamtime at the Institut Laue-Langevin/Grenoble (France). The...
Mrs
Leah Broussard
(Los Alamos National Laboratory)
25/08/2014, 14:30
9) Tests of symmetries and conservation laws
Talk
The Ultracold Neutron Facility at the Los Alamos Neutron Science Center has developed one of the highest density sources of UCN in the world to perform precision measurements of neutron decay observables. The UCNA collaboration has recently published a sub-percent measurement of the beta-asymmetry, A0 = -0.11954 ± 55(stat) ± 98(sys), used to extract λ = gA/gV = -1.2756 ± 30, the ratio of the...
Dr
Alexander Saunders
(Los Alamos National Lab)
25/08/2014, 15:00
9) Tests of symmetries and conservation laws
Talk
Recent measurements of the neutron lifetime have individually reported uncertainties of about 1 s but disagree by as much 7 s, resulting in a shift of about 6.5 sigma in the accepted value over recent years. Measurements based on the decay in flight of cold neutron beams appear to yield longer lifetimes than those based on counting surviving ultracold neutrons after storage in material-walled...
Prof.
yury Uzikov
(Joint Institute for Nuclear Researches)
25/08/2014, 15:20
9) Tests of symmetries and conservation laws
Talk
Time-reversal invariance will be tested in proton-deuteron scattering via an internal target transmission experiment at COSY[1].The polarization asymmetry Ay,xz will be measured using a polarized proton beam (polarization Py) and polarized deuterium target (tensor polarization Pxz). For P-parity conserving interactions this observable provides a real null test of time-reversal invariance which...
Mr
Tommaso Spadaro
(INFN)
25/08/2014, 15:40
9) Tests of symmetries and conservation laws
Talk
Recent results and prospects for precision tests of the Standard Model in kaon decay in flight experiments at CERN are presented. A measurement of the ratio of leptonic decay rates of the charged kaon at a 0.4% precision constrains the parameter space of new physics models with extended Higgs sector, a fourth generation of quarks and leptons or sterile neutrinos.
Searches for heavy neutrino...
Mr
Luca Venturelli
(Universita` di Brescia)
25/08/2014, 16:30
9) Tests of symmetries and conservation laws
Talk
Antihydrogen is the simplest atom made entirely of antimatter, consisting of an antiproton and a positron. The study of its matter counterpart, the hydrogen atom, has produced some of the most precise determinations of physical quantities. High precise measurements of antihydrogen will allow to achieve direct tests of the fundamental symmetries of Nature through the comparison with hydrogen....
Dr
Chloé Malbrunot
(CERN)
25/08/2014, 16:50
9) Tests of symmetries and conservation laws
Talk
The ASACUSA CUSP collaboration at the Antiproton Decelerator of CERN has recently succeeded in detecting 80 antihydrogen atoms 2.7 meters away from their production trap in a magnetic field free region [1]. This successful detection constitutes a milestone toward precision spectroscopy of antimatter atoms in a beam. The goal of the ASACUSA CUSP collaboration is indeed to measure the ground-...
Dr
Masaharu Sato
(RIKEN)
25/08/2014, 17:20
9) Tests of symmetries and conservation laws
Talk
We are planning to measure the ground-state hyperfine splitting energy of muonic hydrogen by laser spectroscopy techniques at the RIKEN-RAL Muon facility. The hyperfine splitting energy is about 0.182 eV, which corresponds to the laser wavelength of 6.7 μm. The experiment has become feasible by a narrow-bandwidth tunable mid-infrared laser recently developed in RIKEN [1]. The expected...
Dr
Libertad Barron-Palos
(Instituto de Fisica, Universidad Nacional Autonoma de Mexico)
25/08/2014, 17:40
9) Tests of symmetries and conservation laws
Talk
The study of the Hadronic Weak Interaction, and particularly of the stangeness-conserving HWI between nucleons, is of interest for several reasons: Some of the phenomena observed in the strangeness-changing HWI cannot be explained in terms of the symmetries of QCD, which opens the possibility for a non-trivial QCD dynamical process that is either related to the presence of the strange quark,...
Mr
Makoto Fujiwara
(TRIUMF)
25/08/2014, 18:00
9) Tests of symmetries and conservation laws
Talk
ALPHA is an international project at CERN, whose ultimate goal is to test symmetry between matter and antimatter at highest possible precision via comparisons of the properties of atomic hydrogen with its antimatter counter-part, antihydrogen. After several years of development, we recently achieved significant milestones, including the first stable confinement of antihydrogen [1] for as long...
Mr
Krishna Kumar
(UMass Amherst)
28/08/2014, 14:00
9) Tests of symmetries and conservation laws
Talk
The technique of measuring tiny single-spin asymmetries in the scattering of longitudinally polarized relativistic electrons off unpolarized fixed targets is well-established. These measurements, which exploit the non-conservation of parity symmetry by the neutral weak interaction, are being used in a variety of applications to address fundamental questions in nuclear and particle physics. One...
Prof.
Paul King
(Ohio University)
28/08/2014, 14:30
9) Tests of symmetries and conservation laws
Talk
The Qweak experiment, which completed a two-year data taking phase in May 2012 at Jefferson Lab, has made the first determination of the weak charge of the proton. We access the weak charge by measuring the parity-violating asymmetry in the elastic scattering of polarized electrons from protons at a small squared four-momentum transfer of Q^2 = 0.025 (GeV/c)^2. Due to the interference of the...
Dr
Vince Sulkosky
(University of Virginia)
28/08/2014, 14:50
9) Tests of symmetries and conservation laws
Talk
We report on the measurement of parity-violating (PV) asymmetries in the
deep inelastic scattering (DIS) and nucleon resonance regions using
inclusive scattering of longitudinally polarized electrons off an
unpolarized deuterium target. The effective weak couplings C_2q are
accessible through the DIS measurements. Here we report a measurement
of the PV asymmetry, which yields a...
Dr
Francesco Renga
(INFN Roma)
28/08/2014, 15:10
9) Tests of symmetries and conservation laws
Talk
Within the Standard Model (SM), in spite of neutrino oscillations, the flavor of charged leptons is conserved in very good approximation, and therefore charged Lepton Flavor Violation (cLFV) is expected to be unobservable. On the other hand, most new physics models predict cLFV within the experimental reach, and processes like the mu -> e gamma decay became standard probes for physics beyond...
Mr
Giovanni Tassielli
(INFN Lecce)
28/08/2014, 15:40
9) Tests of symmetries and conservation laws
Talk
The Mu2e Experiment at Fermilab will search for coherent, neutrino-less conversion of muons
into electrons in the field of a nucleus with a sensitivity improvement of a factor of 10,000
over existing limits. Such a lepton flavor-violating reaction probes new physics at a scale
inaccessible with direct searches at either present or planned high energy colliders. The
experiment both...
Dr
Malgorzata Kasprzak
(University of Fribourg)
28/08/2014, 16:30
9) Tests of symmetries and conservation laws
Talk
Experimental search for an electric dipole moment of the neutron
The existence of a permanent non-zero electric dipole moment of the neutron (nEDM) would be unambiguous evidence for a violation of time reversal symmetry (T). The Standard Model (SM) contribution to the nEDM is of order 10^(-32) e*cm while the current experimental limit is dn < 2.9 * 10^(-26) e*cm. The search for an nEDM is...
Dr
Volker Hejny
(Institut für Kernphysik, Forschungszentrum Jülich)
28/08/2014, 16:50
9) Tests of symmetries and conservation laws
Talk
Electric Dipole Moments (EDM) of elementary particles are considered to be one of the most powerful tools to investigate CP violation beyond the Standard Model and to find an explanation for the dominance of matter over anti-matter in our Universe.
Up to now experiments concentrated on neutral systems (neutrons, atoms, molecules). Storage rings offer the possibility to measure EDMs of charged...
Mr
Wolfgang Korsch
(University of Kentucky)
28/08/2014, 17:20
9) Tests of symmetries and conservation laws
Talk
The existence of a permanent electric dipole moment (EDM) in any non-degenerate system would affirm the presence of Time and
(Charge Conjugation-)Parity Violation in fundamental interactions. The discovery of a non-zero EDM in next-generation experiments may point to an explanation of the numerical size of the baryon asymmetry of the Universe.
Worldwide multiple ongoing efforts are trying...
Mr
Fabian Allmendinger
(Physikalisches Institut, Universität Heidelberg)
28/08/2014, 17:50
9) Tests of symmetries and conservation laws
Talk
We performed a search for a Lorentz-invariance- and CPT-violating coupling of the 3He and 129Xe nuclear spins (each largely determined by a valence neutron) to posited background tensor fields that permeate the Universe. Our experimental approach is to measure the free precession of nuclear spin polarized 3He and 129Xe atoms in a homogeneous magnetic guiding field of about 400 nT using LTC...
Dr
Kathlynne Tullney
(Institute of physics, Johannes-Gutenberg University Mainz)
28/08/2014, 18:10
9) Tests of symmetries and conservation laws
Talk
A possible solution to the strong CP problem is a light pseudoscalar boson, the so-called axion. The axion would cause a new spin-dependent short-range interaction. Of interest here is the search for an axion mediated short range interaction between a fermion and the spin of another fermion. To search for this effect, co-located, nuclear spin polarized 3He and 129Xe gas is used to become...