3 edition of **Dimension eight operators and the neutron electric dipole moment** found in the catalog.

Dimension eight operators and the neutron electric dipole moment

Michael Booth

- 239 Want to read
- 18 Currently reading

Published
**1993**
.

Written in English

- Dipole moments.,
- CP violation (Nuclear physics)

**Edition Notes**

Statement | by Michael Booth. |

Classifications | |
---|---|

LC Classifications | Microfilm 94/2622 (Q) |

The Physical Object | |

Format | Microform |

Pagination | p. 2518-2527, 1248-1251 |

Number of Pages | 2527 |

ID Numbers | |

Open Library | OL1241683M |

LC Control Number | 94628422 |

An analysis of the neutron EDM and of the electron EDM in minimal N=1 supergravity unification with two CP-violating phases is given. For the neutron the analysis includes the complete one loop gluino, chargino, and neutralino exchange diagrams for the electric dipole and the chromoelectric dipole operators, and also the contribution of the purely gluonic dimension-six by: We perform a systematic study of flavor-diagonal parity- and time-reversal-violating operators of dimension six which could arise from physics beyond the SM. We begin at the unknown high-energy scale where these operators originate. At this scale the operators are constrained by gauge invariance which has important consequences for the form of effective operators at lower by:

Measuring the Neutron Electric Dipole Moment - A Tiny Number with Big Implications Dave Wark Imperial/RAL KEK Nov. 8th, Neutron Electric Dipole Moment + _ s Would lead to a non-zero value for dn, either parallel or anti-parallel to s dn would be: P odd. The "neutron electric dipole moment " is a measure for the distribution of positive and negative charge inside the neutron. A finite electric dipole moment can only exist if the centers of the.

Neutron Physics 5 lectures: 1. Physics/Technology of Cold and Ultracold Neutrons 2. Electroweak Standard Model Tests [neutron beta decay] 3. Nuclear physics/QCD [weak interaction between nucleons] Magnetic Dipole Moment: µn/ µp = (17) Electric Dipole Moment: zero File Size: 2MB. Experiments with 2 2 m dimension can be placed inside the shields in pre-assembled state through a door of 2 2 m. A next generation measurement of the electric dipole moment of the neutron at the FRM II. Il nuovo cimento: organo della Societá Italiana di Fisica, 35C, P., & Paul, S. (). EDM - The neutron electric dipole.

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Our calculational procedure is based on the background field method. We discuss the contribution to the nucleon electric dipole moment by means of an effective chiral Lagrangian approach. This is used to evaluate the basic hadronic matrix elements of the dimension-8 operators as well as the pion loop corrections.

operators one has to resort to a non-relativistic approximation [3] or simply to a “naive dimensional analysis” [4]. Lattice calculations are still far from practicality We propose to calculate the electric dipole moment of the neutron within the Skyrme model. It was first demonstrated in refs.

d = x e-cm NaCl: d= x e-cm NH 3: d = x e-cm Note: n-EDM Neutron had degenerate state it would not violate T or CP u dd J u dd J Ground state is actually a superposition J J •.

The remaining operator is anomalously small in the standard model, and one often invokes a Peccei-Quinn mechanism [8] to explain it. Because of the chiral structure of the standard model, the operators at dimension 5 are sup-pressed by v EW=M2 BSM. These are the electric dipole moments y¯SmnF˜mnty of the quarks andCited by: 3.

Our paper therefore represents the first systematic study of contributions to the electric dipole moment of the neutron due to CP-violating dimension-six and dimension-eight operators. Abstract. We derive a CP -odd effective field theory involving the field strengths of the gluon and the photon and their duals as a result of integrating out a heavy quark which carries both the chromo-electric dipole moment and electric dipole moment.

The coefficients of the induced gluonic, photonic, and mixed gluon-photon operators with dimension ⩽8 are by: 5. Neutron Electric Dipole Moment and Tensor Charges from Lattice QCD avor diagonal charges determine the size of the neutron electric dipole moment (EDM) induced by in local operators of dimension ve and six.

Leading, among them, are the elementary fermion EDMs [23, 24]. Weinberg recently pointed out that purely gluonic operators that violate CP, like in particular the dimension six operator GG G can be induced via electroweak radiative corrections; such an operator would generate a non-vanishing value for the neutron electric dipole by: Our paper therefore represents the ﬁrst systematic study of contributions to the electric dipole moment of the neutron due to CP-violating dimension-six and dimension-eight operators.

We provide many details on both the derivation of the sum rules as well as the analysis of the uncertainties that plague.

The neutron electric dipole moment (nEDM) is a measure for the distribution of positive and negative charge inside the neutron.A finite electric dipole moment can only exist if the centers of the negative and positive charge distribution inside the particle do not coincide.

So far, no neutron EDM has been found. The current best measured value for d n is ( ± ) × 10 −26 e⋅cm. The (ﬂavor-conserving) CP-violating effective operators at parton level up to the dimension six are the QCD theta term, the EDMs and the chromoelectric dipole moments (CEDMs) of quarks, the Weinberg’s three-gluon operator [4] and the four-quark operators.

tribute to the neutron electric dipole moment, d n. Check that your operator violates CP and is gauge invariant under the U(1) for electric charge. b) With the full standard model gauge group it is not possible to write down a dimension ﬁve operator analogous to the one you have in a) without breaking the gauge sym metry.

Explain Size: KB. Large contribution to the neutron electric dipole moment from a dimension-six four-quark operator Xiao-Gang He and Bruce McKellar 1 May | Physical Review D, Vol. 47, No.

9Cited by: In this Letter, the renormalization-group equations for the (flavor-conserving) CP-violating interaction are derived up to the dimension six, including all the four-quark operators, at one-loop level.

We apply them to the models with the neutral scalar boson or the color-octet scalar boson which have CP-violating Yukawa interactions with quarks, and discuss the neutron electric dipole moment Cited by: Dimension eight operators of the Weinberg type have been shown to give important contributions to CP violating phenomena, such as the electric dipole moment of the neutron.

In this note we show how operators related to these (and expected to occur on equal footing) can give rise to time-reversal violating phenomena such as atomic electric. The electron electric dipole moment (EDM) d e is an intrinsic property of an electron such that the potential energy is linearly related to the strength of the electric field: = ⋅.

The electron's EDM must be collinear with the direction of the electron's magnetic moment (spin). Within the Standard Model of elementary particle physics, such a dipole is predicted to be non-zero but very small.

Weinberg has observed that a certain dimension six operator can give rise to a large contribution to the neutron electric dipole moment. We give a general formula for the coefficient of this operator, valid in many models, in terms of the quark mass and chromoelectric dipole moment.

We point out that the strong constraints obtained from this operator arise due to an unusually large anomalous. Reevaluation of Neutron Electric Dipole Moment with QCD Sum Rules hisano Department of Physics, Nagoya University NagoyaJapan E-mail: [email protected] We study the neutron electric dipole moment in the presence of the CP-violating operators up to the dimension ﬁve in terms of the QCD sum rules.

QCD Corrections to Neutron Electric Dipole Moment from Dimension-six Four-Quark Operators. CP-violating interaction are derived up to the dimension six, including all the four-quark operators, at one-loop level.

We apply them to the models with the neutral scalar boson or the color-octet scalar boson which have CP-violating Yukawa. The Electric Dipole Moment of the neutron.

To date, every measurement of the neutron electric dipole moment (EDM) has given a value of zero, but there is a good reason to believe it is actually a very small, but non zero, value.

A non-zero electric dipole moment of the neutron (or any fundamental particle) would be a violation of parity (P) and. The transition dipole moment or transition moment, usually denoted for a transition between an initial state, and a final state, is the electric dipole moment associated with the transition between the two states.

In general the transition dipole moment is a complex vector quantity that includes the phase factors associated with the two states. Its direction gives the polarization of the.We have made a systematic study of the electric dipole moment (EDM) of neutron D n in various models of CP violation.

We find that (i) in the standard KM model with 3 families, the neutron EDM is in the range × 10 −33 ≤ |D n | ≤ × 10 −31(ii) the two Higgs doublet model has approximately the same value of D n as the Cited by: neglecting the chargino contribution to the neutron EDM @2,7#.

For the neutron EDM there are two operators other than the electric dipole moment operator, which can contrib-ute to the neutron EDM. One of these is the color dipole operator and the other is the dimension-six purely gluonic operator considered by Weinberg @9#.

With the exception ofCited by: