Lepton dipole moments advanced series on directions in. To read the fulltext of this research, you can request a copy directly from the author. Induced magnetic dipole moment is associated with neutral dirac particle through its interaction with the corresponding charged lepton. The scaling of lepton dipole moments with lepton mass k. Universality alignment left right symmetric lepton flavor. Review of lepton dipole moments produced for the physics in collision 2015 conference. In supersymmetric theories the radiative corrections due to heavy states could leave their footprints in the flavour structure of. One can learn more by exploiting the association between the electric dipole moments of the electron and wboson, dsme and dsm w. In the mesm, the lepton flavor mixing is not allowed just as the sewm.
Pdf scaling of lepton dipole moments with lepton mass. From the famous experiments of stern and gerlach to the present, measurements of magnetic dipole moments, and searches for electric dipole moments of elementary particles have played a major role in our understanding of subatomic physics. Weak dipole moments of the tau lepton in models with an. Introduction the electric dipole moment ed of a particle is defined as follows. Electric dipole moments of charged leptons at one loop in. Lepton dipole moments insupersymmetric lowscale seesaw. Sorry, we are unable to provide the full text but you may find it at the following locations. In this talk i discuss the progress on measurements and theory of the magnetic dipole moments of the electron and muon. We give expressions for the dipole moments in terms of operator coefficients of the lowenergy effective field theory left and the standard model effective field theory smeft. Pdf we analyze the diagonal and transition magnetic and electric dipole moments of charged leptons in extended technicolor etc models, taking. Wboson magnetic dipole and electric quadrupole moments. Jul 22, 2004 a principal result of our analysis is that mixing generically has an important effect on charged lepton dipole moments in etc theories. The effect of the localization of new higgs scalars on the electric dipole moments of.
Electric dipole moments of elementary particles 97 1. The significance of particle and nuclear electric dipole moments is explained in. Electric dipole moments edms and new particle physics. If the molecules have a permanent dipole moment 0, the total dipole moment in and external eld is.
To detect an electric dipole moment, it is usually necessary to place the. The probability density function pdf is constructed from. We show that the magnetic dipole moment of electron neutrino does not get a significant contribution from thermal background to meet the cosmological bound. Lepton dipole moments advanced series on directions in high. However, it is also possible to generate lepton edms in models in which the soft supersymmetry breaking terms are cp conserving, by making use of phases in the neutrino yukawa couplings. Physics, krakow, polland, 2328 june 2019 and online pdf version at. Feasibility of lepton electromagnetic dipole moments. The related topic of the transition moment for lepton flavor violating processes, such as neutrinoless muon or tauon decays, and the search for such processes are included as well. The electric dipole moment of the electron funding nsf. Lepton electric dipole moments in supersymmetric type ii. The magnetic moment, also called magnetic dipole moment, is a measure of the strength of a magnetic source. Cp so10 gut standard model exact universality approx. Lepton electric dipole moments from heavy states yukawa. The dirac magnetic moment, corresponding to treelevel feynman diagrams which can be thought of as the classical result, can be calculated from the dirac equation.
Magnetic moment and electric dipole moment of the lepton. Also included are the searches for a permanent electric dipole moment of the. Lepton electric dipole moments from heavy states yukawa couplings. The method consists in studying the spin precession induced by the strong effective magnetic field inside channels of a bent crystal with a dedicated setup at the cern large hadron collider. From the pioneering work of stern1 through the discovery of the large anomalous magnetic moments of the proton2 and neutron3, the ground work was laid for. We propose a new method to probe the magnetic and electric dipole moments of the. Nick guise harvard 15 prospects for a millionfold improvement in the comparison of the antiproton and proton magnetic moments pdf 11. Apr 01, 1999 two methods of the measurement of the weak dipole moments based on the analysis of the transverse and normal components of single r polarisation azimuthal asymmetries and spinspin correlations optimal observables are discussed. Electric dipole moments of charged leptons and lepton. Charged lepton electric dipole moment enhancement in the. The anomalous weak dipole moments of the \\tau\ lepton are measured in a data sample collected by aleph from 1990 to 1995 corresponding to an integrated luminosity of 155 pb1. Cp heavy sfermions seesaw neutrino yukawa couplings multi higgs split susy naive susy imperial 2011 extended technicolor acme 20 yale.
Pdf the electric dipole moment of the tau lepton revisited. Two types of anomalous weak dipole moments an be distinguished. Cp violation in neutral lepton transition dipole moment. Abstract searches for a permanent electric dipole moment edm of a fundamental. Citeseerx document details isaac councill, lee giles, pradeep teregowda. We recalculate the magnetic moment of neutrinos in a hot and dense medium.
The contribution from neutrino yukawa couplings to lepton. Pdf search for anomalous weak dipole moments of the. Mar 26, 2019 in this paper we discuss the possibility of measuring the anomalous magnetic and electric dipole moments of the. Searching for electric dipole moments jungmann 20 annalen. However, chemical potential contribution to the magnetic moment is nonignorable even when chemical potential is an order of magnitude greater than the electron mass. Effective field theory interpretation of lepton magnetic.
Pdf we propose a new method to probe the magnetic and electric dipole moments of the. Brookhaven national laboratory, usa lel world scientific. Cpviolating dipole moments of leptons vanish at least to three loop order and are estimated to be m l mev. Theory of anomalous magnetic dipole moments of the electron. We perform a modelindependent analysis of the magnetic and electric dipole moments of the muon and electron. B introduction the weak anomalous magnetic and weak electric dipole moments, aw and dw, are intrinsic prop erties of the lepton. Universality alignment left right symmetric lepton flavor changing accidental cancellations so10 gut approx. Lepton dipole moments by b lee roberts 9789814271837. An electric field applies torque to an electric dipole momenttrying to align the dipole with the. Right handed neutrino is the only additional singlet in this model and is inert in nature. The anomalous magnetic dipole moment of the electron, the socalled electron \g2\, provides us with a highprecision test of quantum electrodynamics qed, which is the relativistic and quantummechanical generalization of electromagnetism, and helps to determine the value of the fine structure constant \\alpha \, one of the fundamental physical constants. It focuses on the electric dipole moments of the electron, muon, tau lepton, and their. Theory of anomalous magnetic dipole moments of the. Lepton dipole moments insupersymmetric lowscale seesaw models.
Maura ramirezquezada2 and yeling zhou3 1 school of physics, the university of sydney, nsw 2006, australia 2 institute for particle physics phenomenology, department of physics, durham university, durham dh1 3le, united kingdom 3 school of physics and astronomy, university of southampton. Introduction and experimental status in the following, we extend the discussion of the neutron electric dipole moment given in sect. Prospects for a millionfold improvement in the comparison of the antiproton and proton magnetic moments pdf 11. This possibility has been explored by many authors 6. Ix4 of dgh2 to that of the electron, and also comment on the remaining charged lep. Physics department, middle east technical university ankara, turkey abstract we calculate the electric dipole moment of electron using the experimental result of. The magnetic dipole moment of neutrinos is modified at high temperature and chemical potential. Mar, 1997 march 1997 physics letters b 395 1997 369372 physics letters b improved bounds on the electromagnetic dipole moments of the tau lepton r. However, chemical potential contribution to the magnetic moment is.
The probability density function pdf is constructed from the total differential cross. Also included are the searches for a permanent electric dipole moment of the electron, muon, neutron and atomic nuclei. In the standard model they are zero at born level but higher order loop corrections lead to aw 2. We present compact expressions for leptonic dipole moments and lepton flavor. Dipole moments connect states of opposite helicity violation of individual flavor lepton numbers neutrino mixing magnetic or electric dipole moments can connect different flavors or different mass eigenstates transition moments usually measured in ohr magnetons m b e2m e. We use an effective lagrangian description for physics beyond the standard model which contains the. The dipole moments of the leptons and quarks are matrices in flavor space, which can potentially reveal as much about the flavor structure of the theory as do the mass matrices.
Apr 19, 2010 we show that the cp violating phase of the bilinear soft supersymmetry breaking term associated with the su 2 w triplets contributes to lepton electric dipole moments mainly through threshold corrections to the gaugino masses at the seesaw scale. Oct 10, 2020 alper hayreter, german valenciaconstraining. For numerical estimates of the dipole matrix, we take. From the famous experiments of stern and gerlach to the present, measurements of magnetic dipole moments, and searches for electric dipole moments of elementary particles have played a major role in our understanding of sub. Pdf lepton dipole moments in extended technicolor models. Proposal to measure the muon electric dipole moment with a. Let the coordinate t be measured from the centre of mass of a particle and let pjj be the charge density inside the particle whose angular momentum is j with quantum number j and whose orientation state is given by m j relative to. Feb 22, 2007 lepton dipole moments define g and as unitfree quantities describing magnetic and electric dipole moments, respectively. In this paper the edm search analysis method will be illustrated. Electric dipole moments of charged leptons at one loop in the. Ippp2038 cp violation in neutral lepton transition dipole moment shyam balaji,1. Lepton dipole moments in extended technicolor models. They are zero to rst order in the standard model sm. New physics than observables connected to hadron and lepton flavour.
Maura ramirezquezada2 and yeling zhou3 1 school of physics, the university of sydney, nsw 2006, australia 2 institute for particle physics phenomenology, department of physics, durham university, durham dh1 3le, united kingdom. Introduction and theory of the lepton anomalies over the past 82 years, the study of dipole moments of elementary particles has provided a wealth of information on subatomic physics. Sensitivity on the electromagnetic dipole moments of the taulepton. Most studies on lepton dipole moments have been devoted to susy models realizing a high scale seesaw mechanism 2023. Cp violation in neutral lepton transition dipole moment shyam balaji,1. We study the constraints that can be placed on anomalous. This possibility is analyzed altogether with the anomalous magnetic moments of charged leptons, among which we estimate, for the. Wolfgang quint gsi darmstadt this talk is cancelled because of visa problems with the us dohs. Physikalischchemisches praktikum i dipole moment 2016 induced dipole moment i is always oriented in the direction of e0, i. Improved bounds on the electromagnetic dipole moments of the. Averaging the lep measurements, upper limits on the weak electric dipole moment of the r lepton are obtained. Example feynman diagram of a np contribution to a magnetic. Improved bounds on the electromagnetic dipole moments of. In this talk i discuss the progress on measurements and theory.
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