The NNLO QCD corrections to the Q1,2-Q7 interference in B to Xs gamma are now computed with full charm-quark-mass dependence, replacing interpolation and giving B_s gamma^SM = (3.54 +/- 0.14) x 10^-4.
Estimate of BR(B -> X_s gamma) at O(alpha_s^2)
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abstract
Combining our results for various O(alpha_s^2) corrections to the weak radiative B-meson decay, we are able to present the first estimate of the branching ratio at the next-to-next-to-leading order in QCD. We find BR(B -> X_s gamma) = (3.15 +_ 0.23) x 10^-4 for E_gamma > 1.6 GeV in the B-meson rest frame. The four types of uncertainties: non-perturbative (5%), parametric (3%), higher-order (3%) and m_c-interpolation ambiguity (3%) have been added in quadrature to obtain the total error.
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The Standard Model branching ratio for B to X_s gamma is updated to (3.54 ± 0.14) x 10^-4 using an exact next-to-next-to-leading-order charm mass calculation.
A global fit of the Georgi-Machacek and extended Georgi-Machacek models finds that the 95 GeV diphoton and bottom-quark excesses are compatible with the 125 GeV Higgs data, while the ditau excess is not, and it sets upper bounds on the additional scalar masses.
All seven light-scalar scenarios of the CP-conserving aligned two-Higgs-doublet model contain sizeable parameter regions compatible with current collider and flavour data, with the lightest new scalars bounded by LEP and LHC searches.
New moment relations for the soft function g17, combined with a 2016 global fit of HQET parameters, tighten the resolved photon contribution to the B -> X_s gamma total rate to about [-0.3,+1.6]% but widen the CP-asymmetry window to [-1.9,+3.3]%.
In the Generational Three-Higgs-Doublet Model, the flavor-changing decay h→bs can reach a branching ratio around 10^-3, dominated by a tree-level Higgs flavor-changing coupling, while surviving current constraints.
Under B̄ o Xsγ constraints, NB-LSSM parameters can raise Br(h o bs) to ~10^{-5}, orders of magnitude above the SM, while remaining consistent with Higgs mass and signal strengths.
The paper surveys theoretical motivations, experimental searches, and bounds on the dark photon as a kinetically mixed gauge boson from a dark sector, covering both massive and massless cases along with related milli-charged fermion constraints.
citing papers explorer
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NNLO QCD corrections to the weak radiative $B$-meson decay with exact dependence on $m_c$
The NNLO QCD corrections to the Q1,2-Q7 interference in B to Xs gamma are now computed with full charm-quark-mass dependence, replacing interpolation and giving B_s gamma^SM = (3.54 +/- 0.14) x 10^-4.
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Update of the Standard-Model prediction for $\bar B \to X_s \gamma$
The Standard Model branching ratio for B to X_s gamma is updated to (3.54 ± 0.14) x 10^-4 using an exact next-to-next-to-leading-order charm mass calculation.
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Light Scalars in the Extended Georgi-Machacek Model
A global fit of the Georgi-Machacek and extended Georgi-Machacek models finds that the 95 GeV diphoton and bottom-quark excesses are compatible with the 125 GeV Higgs data, while the ditau excess is not, and it sets upper bounds on the additional scalar masses.
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Light scalars within the $\mathcal{CP}$-conserving Aligned-two-Higgs-doublet model
All seven light-scalar scenarios of the CP-conserving aligned two-Higgs-doublet model contain sizeable parameter regions compatible with current collider and flavour data, with the lightest new scalars bounded by LEP and LHC searches.
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Reevaluating Uncertainties in $\bar B\to X_s\gamma$ Decay
New moment relations for the soft function g17, combined with a 2016 global fit of HQET parameters, tighten the resolved photon contribution to the B -> X_s gamma total rate to about [-0.3,+1.6]% but widen the CP-asymmetry window to [-1.9,+3.3]%.
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The Higgs boson decay $h \to bs$ in the Generational Three-Higgs-Doublet Model
In the Generational Three-Higgs-Doublet Model, the flavor-changing decay h→bs can reach a branching ratio around 10^-3, dominated by a tree-level Higgs flavor-changing coupling, while surviving current constraints.
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The Higgs boson decay $h \rightarrow bs$ in the NB-LSSM
Under B̄ o Xsγ constraints, NB-LSSM parameters can raise Br(h o bs) to ~10^{-5}, orders of magnitude above the SM, while remaining consistent with Higgs mass and signal strengths.
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The Dark Photon
The paper surveys theoretical motivations, experimental searches, and bounds on the dark photon as a kinetically mixed gauge boson from a dark sector, covering both massive and massless cases along with related milli-charged fermion constraints.
- Electro-Weak Phase Transitions and Collider Signals in the Aligned 2-Higgs Doublet Model