First-order radiative corrections to asymmetry coefficients in neutron decay

García, A.; Maya, M.

doi:10.1103/physrevd.17.1376

Cited by 38 publications

(46 citation statements)

References 16 publications

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“…Those effects, characterized by the departure of the form factor f 0 from one along with isospin breaking effects, were considered in the classic study by Leutwyler and Roos [43] that forms the basis for the extracted value of jV us j in Eq. (29).…”

Section: Jv Us J Determinations and Ckm Unitaritymentioning

confidence: 95%

“…(5) is consistent with the so-called 1=k method, in which the radiative corrections to various observables in -decay, such as the lifetime, the electron spectrum, and the longitudinal electron polarization, are expressed in terms of effective couplings G V and G A [23][24][25][26]. The same approach has been employed to calculate the corrections to the electron asymmetry [27][28][29][30][31]. The factorization of the short-distance contributions of the radiative corrections, implicit in Eq.…”

Section: Radiative Corrections To Neutron Decaymentioning

confidence: 97%

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Precision measurements and CKM unitarity

2004

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Determinations of |V ud | and |Vus| along with their implications for the unitarity test |V ud | 2 + |Vus| 2 + |V ub | 2 = 1 are discussed. The leading two loop radiative corrections to neutron β-decay are evaluated and used to derive a refined relationship |V ud | 2 τn(1 + 3g 2 A ) = 4908(4)sec. Employing |V ud | = 0.9740( 5) from superallowed nuclear decays and the measured neutron lifetime τn = 885.7(7)sec, leads to the precise prediction gA = 1.2703(8) which is compared with current direct experimental values. Various extractions of |Vus| are described and updated. The long accepted Particle Data Group value of |Vus| from fitted Ke3 decay rates suggests a deviation from CKM unitarity but it is contradicted by more recent experimental results which confirm unitarity with good precision. An outlook for possible future advances is given.

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Section: Jv Us J Determinations and Ckm Unitaritymentioning

confidence: 95%

Section: Radiative Corrections To Neutron Decaymentioning

confidence: 97%

Precision measurements and CKM unitarity

2004

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“…(E e , ω min ), calculated by means of the infrared cut-off regularization ω min , have energy dependencies different in comparison with the functions, calculated in the FPM regularization (see also [25]). …”

Section: (B-13)mentioning

confidence: 98%

Neutronβ−decay as a laboratory for testing the standard model

2013

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We analyse the sensitivity of all experimentally observable asymmetries and energy distributions for the neutron β − -decay with a polarized neutron and unpolarised decay proton and electron and the lifetime of the neutron to contributions of order 10 −4 of interactions beyond the Standard model (SM). Since the asymmetries and energy distributions are expressed in terms of the correlation coefficients of the neutron β − -decay, in order to obtain a theoretical background for the analysis of contributions beyond the SM we revise the calculation of the correlation coefficients within the SM. We take into account a complete set of contributions, induced to next-to-leading order in the large proton mass expansion by the "weak magnetism" and the proton recoil, and the radiative corrections of order (α/π), calculated to leading order in the large proton mass expansion. We confirm the results, obtained in literature. The contributions of interactions beyond the SM we analyse in the linear approximation with respect to the Herczeg phenomenological coupling constants, introduced at the hadronic level. Such an approximation is good enough for the analysis of contributions of order 10 −4 of interactions beyond the SM. We show that in such an approximation the correlation coefficients depend only on the axial coupling constant, which absorbs the contributions of the Herczeg left-left and left-right lepton-nucleon current-current interactions (vector and axial-vector interactions beyond the SM), and the Herczeg scalar and tensor coupling constants. In the lifetime of the neutron in addition to the axial coupling constant the contributions of the Herczeg left-left and left-right lepton-nucleon current-current interactions (vector and axial-vector interactions beyond the SM) are absorbed by the Cabibbo-Kobayashi-Maskawa (CKM) matrix element.

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“…Much of the work had already been advanced in early calculations for the energy spectrum of the charged lepton and for the decay distribution of polarized baryons [6,8,9,10], so the new task was to adapt the results for the DP. In this respect, an expression for the DP of semileptonic decays of charged and neutral baryons including RC to order α and neglecting terms of order αq was introduced in Ref.…”

Section: Radiative Corrections In Bsd: the Early Yearsmentioning

confidence: 99%

“…A systematic study of the calculation of RC in BSD was initiated back in 1980 [6] following an approach originally introduced by Sirlin [4] for the electron energy spectrum in neutron decay and later extended to the decay of polarized neutrons [7,8]. An expression for the electron energy spectrum including radiative corrections was obtained in Ref.…”

Section: Radiative Corrections In Bsd: the Early Yearsmentioning

confidence: 99%

Baryon semileptonic decays: the Mexican contribution

Flores‐Mendieta¹,

Martinez²

2006

AIP Conference Proceedings

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Abstract. We give a detailed account of the techniques to compute radiative corrections in baryon semileptonic decays developed over the years by Mexican collaborations. We explain how the method works by obtaining an expression for the Dalitz plot of semileptonic decays of polarized baryons including radiative corrections to order O(αq/πM 1 ), where q is the four-momentum transfer and M 1 is the mass of the decaying baryon. From here we compute the totally integrated spin angular asymmetry coefficient of the emitted baryon and compare its value with other results.

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First-order radiative corrections to asymmetry coefficients in neutron decay

Abstract: Electromagnetic radiative corrections to the electron-neutrino, electron, and neutrino asymmetry coefficients in neutron fl decay are calculated. Strong-interaction effects are retained as suggested by Sirlin

Cited by 38 publications

References 16 publications

Precision measurements and CKM unitarity

Precision measurements and CKM unitarity

Neutronβ−decay as a laboratory for testing the standard model

Baryon semileptonic decays: the Mexican contribution

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