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Two-loop QCD corrections to the MSSM Higgs masses beyond the effective-potential approximation.

Degrassi G, Di Vita S, Slavich P - Eur Phys J C Part Fields (2015)

Bottom Line: We adopt either the [Formula: see text] renormalization scheme or a mixed on-shell (OS)-[Formula: see text] scheme where the top/stop parameters are renormalized on-shell.We compare our results with those of earlier calculations, pointing out an inconsistency in a recent result obtained in the mixed OS-[Formula: see text] scheme.The numerical impact of the new corrections on the prediction for the lightest-scalar mass is moderate, but already comparable to the accuracy of the Higgs-mass measurement at the Large Hadron Collider.

View Article: PubMed Central - PubMed

Affiliation: Dipartimento di Matematica e Fisica, Università di Roma Tre and INFN, Sezione di Roma Tre, Via della Vasca Navale 84, 00146 Rome, Italy.

ABSTRACT

We compute the two-loop QCD corrections to the neutral Higgs-boson masses in the Minimal Supersymmetric Standard Model, including the effect of non-vanishing external momenta in the self-energies. We obtain corrections of [Formula: see text] and [Formula: see text], i.e., all two-loop corrections that involve the strong gauge coupling when the only non-vanishing Yukawa coupling is the top one. We adopt either the [Formula: see text] renormalization scheme or a mixed on-shell (OS)-[Formula: see text] scheme where the top/stop parameters are renormalized on-shell. We compare our results with those of earlier calculations, pointing out an inconsistency in a recent result obtained in the mixed OS-[Formula: see text] scheme. The numerical impact of the new corrections on the prediction for the lightest-scalar mass is moderate, but already comparable to the accuracy of the Higgs-mass measurement at the Large Hadron Collider.

No MeSH data available.


Related in: MedlinePlus

Predictions for the mass of the lightest scalar  in the six benchmark scenarios of Ref. [77], for  and . For each scenario, the three bars show: the “unperturbed” mass  computed with FeynHiggs 2.10.2 (upper), the inclusion of the momentum-dependent part of the  corrections (middle) and the additional inclusion of the whole  corrections (lower). From top to bottom, the considered scenarios are  (red),  (blue),  (green), light stop (turquoise), light stau (purple), tau-phobic (orange)
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Fig1: Predictions for the mass of the lightest scalar in the six benchmark scenarios of Ref. [77], for and . For each scenario, the three bars show: the “unperturbed” mass computed with FeynHiggs 2.10.2 (upper), the inclusion of the momentum-dependent part of the corrections (middle) and the additional inclusion of the whole corrections (lower). From top to bottom, the considered scenarios are (red), (blue), (green), light stop (turquoise), light stau (purple), tau-phobic (orange)

Mentions: In Fig. 1 we present our predictions for the lightest-scalar mass in the six benchmark scenarios. We choose and , so that the lightest scalar is SM-like, the bound on its tree-level mass is saturated, and the corrections controlled by the bottom Yukawa coupling, which we do not compute beyond the approximations of FeynHiggs, are not expected to be particularly relevant. For each scenario we show three bars: the upper one represents the “unperturbed” mass , obtained from FeynHiggs without additional corrections; the middle bar includes the effect of the momentum-dependent part of the corrections, i.e. the defined in Eq. (12); finally, the lower bar represents our final result for , and includes the effects of both the momentum-dependent part of the corrections and the corrections, i.e. the defined in Eq. (14).Fig. 1


Two-loop QCD corrections to the MSSM Higgs masses beyond the effective-potential approximation.

Degrassi G, Di Vita S, Slavich P - Eur Phys J C Part Fields (2015)

Predictions for the mass of the lightest scalar  in the six benchmark scenarios of Ref. [77], for  and . For each scenario, the three bars show: the “unperturbed” mass  computed with FeynHiggs 2.10.2 (upper), the inclusion of the momentum-dependent part of the  corrections (middle) and the additional inclusion of the whole  corrections (lower). From top to bottom, the considered scenarios are  (red),  (blue),  (green), light stop (turquoise), light stau (purple), tau-phobic (orange)
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4376467&req=5

Fig1: Predictions for the mass of the lightest scalar in the six benchmark scenarios of Ref. [77], for and . For each scenario, the three bars show: the “unperturbed” mass computed with FeynHiggs 2.10.2 (upper), the inclusion of the momentum-dependent part of the corrections (middle) and the additional inclusion of the whole corrections (lower). From top to bottom, the considered scenarios are (red), (blue), (green), light stop (turquoise), light stau (purple), tau-phobic (orange)
Mentions: In Fig. 1 we present our predictions for the lightest-scalar mass in the six benchmark scenarios. We choose and , so that the lightest scalar is SM-like, the bound on its tree-level mass is saturated, and the corrections controlled by the bottom Yukawa coupling, which we do not compute beyond the approximations of FeynHiggs, are not expected to be particularly relevant. For each scenario we show three bars: the upper one represents the “unperturbed” mass , obtained from FeynHiggs without additional corrections; the middle bar includes the effect of the momentum-dependent part of the corrections, i.e. the defined in Eq. (12); finally, the lower bar represents our final result for , and includes the effects of both the momentum-dependent part of the corrections and the corrections, i.e. the defined in Eq. (14).Fig. 1

Bottom Line: We adopt either the [Formula: see text] renormalization scheme or a mixed on-shell (OS)-[Formula: see text] scheme where the top/stop parameters are renormalized on-shell.We compare our results with those of earlier calculations, pointing out an inconsistency in a recent result obtained in the mixed OS-[Formula: see text] scheme.The numerical impact of the new corrections on the prediction for the lightest-scalar mass is moderate, but already comparable to the accuracy of the Higgs-mass measurement at the Large Hadron Collider.

View Article: PubMed Central - PubMed

Affiliation: Dipartimento di Matematica e Fisica, Università di Roma Tre and INFN, Sezione di Roma Tre, Via della Vasca Navale 84, 00146 Rome, Italy.

ABSTRACT

We compute the two-loop QCD corrections to the neutral Higgs-boson masses in the Minimal Supersymmetric Standard Model, including the effect of non-vanishing external momenta in the self-energies. We obtain corrections of [Formula: see text] and [Formula: see text], i.e., all two-loop corrections that involve the strong gauge coupling when the only non-vanishing Yukawa coupling is the top one. We adopt either the [Formula: see text] renormalization scheme or a mixed on-shell (OS)-[Formula: see text] scheme where the top/stop parameters are renormalized on-shell. We compare our results with those of earlier calculations, pointing out an inconsistency in a recent result obtained in the mixed OS-[Formula: see text] scheme. The numerical impact of the new corrections on the prediction for the lightest-scalar mass is moderate, but already comparable to the accuracy of the Higgs-mass measurement at the Large Hadron Collider.

No MeSH data available.


Related in: MedlinePlus