(g− 2)μand α(M2Z) re-evaluated using new precise data

Hagiwara, Kaoru; Liao, Ruofan; Martin, A. D.; Nomura, Daisuke; Teubner, T.

doi:10.1088/0954-3899/38/8/085003

Cited by 693 publications

(848 citation statements)

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“…[18], which is used in the KNT analysis [1]. By using these new data sets, together with our improved data-combination algorithm, which we will discuss in the next subsection, we obtain an improvement of more than 30% in this channel compared to the HLMNT analysis [13], as shown in Table 3.…”

Section: Update In Input Datamentioning

confidence: 95%

“…[1], often comparing the result with the one given in Ref. [13], which is the previous analysis in which two of the KNT collaboration are involved. Below we refer to Ref.…”

Section: Leading Order Hadronic Vacuum Polarisation Contribution To a µmentioning

confidence: 96%

“…Since the HLMNT paper [13], in the most important π + π − channel, two major data sets have appeared: one from the KLOE experiment [14], and the other from the BE-SIII collaboration [15]. To correctly compute the dispersive integral, we have to take into account correlations between data sets.…”

Section: Update In Input Datamentioning

confidence: 99%

“…In the KNT analysis, we linearly interpolate the cross sections between adjacent clusters, which allows us a more stable determination of the combined cross section. The concrete procedure is the following: We first determine cluster centres E m and the cross section value R m at E = E m by [1] and the HLMNT11 analysis [13]. Similarly to Table 2, the numbers from the energy region √ s ≤ 2 GeV include contributions from data as well as near-threshold contributions to 2π, 3π and π 0 γ channels.…”

Section: Improvements In Data Combination Algorithmmentioning

confidence: 99%

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Hadronic Leading Order Contribution to the Muon g-2

Nomura

2018

EPJ Web Conf.

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Abstract. We calculate the Standard Model (SM) prediction for the muon anomalous magnetic moment. By using the latest experimental data for e + e − → hadrons as input to dispersive integrals, we obtain the values of the leading order (LO) and the next-to-leading-order (NLO) hadronic vacuum polarisation contributions as a had, LO VP µ = (693.27 ± 2.46) × 10 −10 and a had, NLO VP µ = (−9.82 ± 0.04) × 10 −10 , respectively. When combined with other contributions to the SM prediction, we obtain a µ (SM) = (11659182.05 ± 3.56) × 10 −10 , which is deviated from the experimental value by ∆a µ ≡ a µ (exp) − a µ (SM) = (27.05 ± 7.26) × 10 −10 . This means that there is a 3.7 σ discrepancy between the experimental value and the SM prediction. We also discuss another closely related quantity, the running QED coupling at the Z-pole, α(M 2 Z ). By using the same e + e − → hadrons data as input, our result for the 5-flavour quark contribution to the running QED coupling at the Z pole is ∆α (5) had (M 2 Z ) = (276.11 ± 1.11) × 10 −4 , from which we obtain α −1 (M 2 Z ) = 128.946 ± 0.015.

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Section: Update In Input Datamentioning

confidence: 95%

“…[1], often comparing the result with the one given in Ref. [13], which is the previous analysis in which two of the KNT collaboration are involved. Below we refer to Ref.…”

Section: Leading Order Hadronic Vacuum Polarisation Contribution To a µmentioning

confidence: 96%

Section: Update In Input Datamentioning

confidence: 99%

Section: Improvements In Data Combination Algorithmmentioning

confidence: 99%

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Hadronic Leading Order Contribution to the Muon g-2

Nomura

2018

EPJ Web Conf.

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“…A phenomenological approach [4,5] based on a dispersion relation and on the experimental measurement of the cross-section for hadron production in e + e − -annihilation provides a method to determine the hadronic contribution to the running of α(Q 2 ). A similar approach is used to extract the lowest-order hadronic contribution to the muon g − 2.…”

Section: Introductionmentioning

confidence: 99%

Study of the hadronic contributions to the running of the QED coupling and the weak mixing angle

Herdoíza¹,

Francis²,

Guelpers³

et al. 2016

Proceedings of the 33rd International Symposium on Lattice Field Theory — PoS(LATTICE 2015)

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The electromagnetic coupling receives significant contributions to its running from nonperturbative QCD effects. We present an update of a lattice QCD study of the Adler function and of its application to the determination to the running of the QED coupling. We perform a high-statistics computation with two flavours of O(a) improved Wilson fermions in a large range of momentum transfer Q 2 . The running of the electromagnetic coupling, including contributions from u, d, s and c valence quarks, is compared to phenomenological determinations at intermediate Q 2 values. An extension of this study to the determination of the hadronic contributions to the running of the weak mixing angle is also described.

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Supersymmetry after the Higgs

Nath

2015

Annalen der Physik

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A brief review is given of the implications of a 126 GeV Higgs boson for the discovery of supersymmetry. Thus a 126 GeV Higgs boson is problematic within the Standard Model because of vacuum instability pointing to new physics beyond the Standard Model. The problem of vacuum stability is overcome in the SUGRA GUT model but the 126 GeV Higgs mass implies that the average SUSY scale lies in the several TeV region. The largeness of the SUSY scale relieves the tension on SUGRA models since it helps suppress flavor changing neutral currents and CP violating effects and also helps in extending the proton life time arising from baryon and lepton number violating dimension five operators. The geometry of radiative breaking of the electroweak symmetry and fine tuning in view of the large SUSY scale are analyzed.Consistency with the Brookhaven g μ − 2 result is discussed. It is also shown that a large SUSY scale implied by the 126 GeV Higgs boson mass allows for light gauginos (gluino, charginos, neutralinos) and sleptons. These along with the lighter third generation squarks are the prime candidates for discovery at RUN II of the LHC. Implication of the 126 GeV Higgs boson for the direct search for dark matter is discussed. Also discussed are the sparticles mass hierarchies and their relationship with the simplified models under the Higgs boson mass constraint.In 2012 the Large Hadron Collider (LHC) made a landmark discovery of a new boson. Thus the CMS and AT-LAS collaborations discovered a boson with a mass of ∼126 GeV [1][2][3][4]. It is now confirmed that this newly discovered particle is the long sought after Higgs boson [5][6][7][8] which plays a central role in the breaking of the electroweak symmetry. While the observed particle is the last missing piece of the Standard Model there are strong indications that at the same time its discovery portends discovery of a new realm of physics specifically supersymmetry. Below we elaborate on this theme in further detail.The outline of the rest of the paper is as follows: In Section 1 we discuss the status of the Higgs boson in the Standard Model, the issue of vacuum instability and the need for new physics beyond the Standard Model. In Section 2 we consider the implications of a 126 GeV Higgs boson within the framework of supersymmetry and specifically in the framework of supergravity unified models. As is well known a 126 GeV Higgs boson within supersymmetry leads to a high SUSY scale M s with M s lying in the TeV region. On the other hand the Brookhaven g μ − 2 experiment [9] shows a 3σ deviation from the Standard Model prediction [10,11]. An effect of this size requires that the average scale of sparticle masses entering the loops in the supersymmetric electroweak correction to g μ − 2 be low, i..e, O(100) GeV. Assuming the 3σ effect is robust we discuss in Section 3 how to reconcile the high SUSY scale that is indicated by the 126 GeV Higgs boson mass with the low SUSY scale indicated by the Brookhaven experiment. In Section 4 we discuss the implications of the Higgs ...

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(g− 2)_μand α(M²_Z) re-evaluated using new precise data

Cited by 693 publications

References 88 publications

Hadronic Leading Order Contribution to the Muon g-2

Hadronic Leading Order Contribution to the Muon g-2

Study of the hadronic contributions to the running of the QED coupling and the weak mixing angle

Supersymmetry after the Higgs

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