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Results for “electroweak interactions”
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Heavy QCD axion at Belle II: Displaced and prompt signals
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Electron mass singularities in semileptonic kaon decays
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Phonon background from gamma rays in sub-GeV dark matter detectors
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Measurement of inclusive charged-current ν μ scattering on hydrocarbon at ⟨ E ν ⟩ ∼ 6 GeV with low three-momentum transfer
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Spin correlations in τ -lepton pair production due to anomalous magnetic and electric dipole moments
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Implications for the Δ A F B anomaly in B ¯ 0 → D * + ℓ − ν ¯ using a new Monte Carlo event generator
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Measurement of the branching fractions for Cabibbo-suppressed decays D + → K + K - π + π 0 and D ( s ) + → K + π - π + π 0 at Belle
We present measurements of the branching fractions for the singly Cabibbo-suppressed decays and , and the doubly Cabibbo-suppressed decay , based on of data recorded by the Belle experiment at the KEKB e + e - collider. We measure these modes relative to the Cabibbo-favored modes D + → K - π + π + π 0 and D$^{+}_{s}$ → K + K - π + π 0 . Our results for the ratios of branching fractions are $\mathscr{B}$(D + →K + K - π + π 0 )/$\mathscr{B}$(D + → K - π + π + π 0 ) =(11.32±0.13±0.26)%, $\mathscr{B}$(D + →K + π - π + π 0 )/$\mathscr{B}$(D + →K - π + π + π 0 ) =(1.68±0.11±0.03)%, and $\mathscr{B}$(D$^{+}_{s}$ → K + π - π + π 0 )/$\mathscr{B}$(D$^{+}_{s}$ → K + K - π + π 0 ) =(17.13±0.62±0.51)%, where the uncertainties are statistical and systematic, respectively. The second value corresponds to (5.83 ±0.42) ×tan 4 θ C , where θ C is the Cabibbo angle; this value is larger than other measured ratios of branching fractions for a doubly Cabibbo-suppressed charm decay to a Cabibbo-favored decay. Multiplying these results by world average values for $\mathscr{B}$(D + → K - π + π + π 0 ) and $\mathscr{B}$(D$^{+}_{s}$ → K + K - π + π 0 ) yields $\mathscr{B}$( + →K + K - π + π 0 ) = (7.08±0.08±0.16±0.20)×10 -3 , $\mathscr{B}$(D + → K + π - π + π 0 ) =(1.05±0.07±0.02±0.03)×10 -3 , and $\mathscr{B}$(D$^{+}_{s}$ → K + π - π + π 0 ) =(9.44±0.34±0.28±0.32)×10 -3 , where the third uncertainty is due to the branching fraction of the normalization mode. The first two results are consistent with, but more precise than, the current world averages. The last result is the first measurement of this branching fraction.
Measurement of the branching fraction and search for CP violation in D 0 → K $^{0}_{S}$ K $^{0}_{S}$ π + π - decays at Belle
We measure the branching fraction for the Cabibbo-suppressed decay D 0 → K $^{0}_{S}$ K $^{0}_{S}$ π + π - and search for CP violation via a measurement of the CP asymmetry A CP as well as the T-odd triple-product asymmetry a$^{T}_{CP}$. We use 922 fb -1 of data recorded by the Belle experiment, which ran at the KEKB asymmetric-energy e + e - collider. The branching fraction is measured relative to the Cabibbo-favored normalization channel D 0 → K $^{0}_{S}$ π + π - ; the result is $\mathscr{B}$( D 0 → K $^{0}_{S}$ K $^{0}_{S}$ π + π - )=[4.79±0.08(stat)±0.10(syst)±0.31(norm)]×10 -4 , where the first uncertainty is statistical, the second is systematic, and the third is from uncertainty in the normalization channel. We also measure A CP =[-2.51±1.44(stat)$^{+0.11}_{-0.10}$(syst)]%, and a$^{T}_{CP}$=[-1.95±1.42(stat)$^{+0.14}_{-0.12}$(syst)]%. These results show no evidence of CP violation.
Averages of b -hadron, c -hadron, and τ -lepton properties as of 2021
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Independence of current components, polarization vectors, and reference frames in the light-front quark model analysis of meson decay constants
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Data-based determination of the isospin-limit light-quark-connected contribution to the anomalous magnetic moment of the muon
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Measurement of the branching fraction and CP asymmetry of B 0 →π 0 π 0 decays using 198×10 6 $B\overline{B}$ pairs in Belle II data
We report measurements of the branching fraction and C P asymmetry in B 0 → π 0 π 0 decays reconstructed at Belle II in an electron-positron collision sample containing 198 × 10 6 B B ¯ pairs. We measure a branching fraction B ( B 0 → π 0 π 0 ) = ( 1.38 ± 0.27 ± 0.22 ) × 10 - 6 and a C P asymmetry A C P ( B 0 → π 0 π 0 ) = - 0.14 ± 0.46 ± 0.07 , where the first uncertainty is statistical and the second is systematic.
Light quark and antiquark constraints from new electroweak data
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Impact of dimension-eight SMEFT operators in the electroweak precision observables and triple gauge couplings analysis in universal SMEFT
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Simulating rare kaon decays K + → π + ℓ + ℓ − using domain wall lattice QCD with physical light quark masses
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Measurement of the production of a $W$ boson in association with a charmed hadron in $pp$ collisions at $\sqrt{s}$ = $\mathrm{13 TeV}$ with the ATLAS detector
The production of a $W$ boson in association with a single charm quark is studied using 140 fb –1 of $\sqrt{s}$ = $13$ $\mathrm{TeV}$ proton-proton collision data collected with the ATLAS detector at the Large Hadron Collider. The charm quark is tagged by the presence of a charmed hadron reconstructed with a secondary-vertex fit. The $W$ boson is reconstructed from the decay to either an electron or a muon and the missing transverse momentum present in the event. The charmed mesons reconstructed are D + → K – π + π + and D *+ → D 0 π + → (K – π + ) π + and the charge conjugate decays in the fiducial regions where $p$ T ($e,μ$) > 30 GeV, |$η(e,μ)$| < 2.5, $p$ T (D (*) ) > 8 GeV, and |$η$(D (*) )| < 2.2. The integrated and normalized differential cross sections as a function of the pseudorapidity of the lepton from the $W$ boson decay, and of the transverse momentum of the charmed hadron, are extracted from the data using a profile likelihood fit. The measured total fiducial cross sections are ${σ}_{fid}^{OS – SS}$ (W – + D + ) = 50.2 ± 0.2 ${(stat)}_{–2.3}^{+2.4}$(syst) pb, ${σ}_{fid}^{OS – SS}$ (W + + D – ) = 48.5 ± 0.2 ${(stat)}_{–2.2}^{+2.3}$(syst) pb, ${σ}_{fid}^{OS – SS}$ (W – + D *+ ) = 51.1 ± 0.4 ${(stat)}_{–1.8}^{+1.9}$(syst) pb, ${σ}_{fid}^{OS – SS}$ (W + + D *– ) = 50.0 ± 0.4 ${(stat)}_{–1.8}^{+1.9}$(syst) pb. Results are compared with the predictions of next-to-leading-order quantum chromodynamics calculations performed using state-of-the-art parton distribution functions. Additionally, the ratio of charm to anticharm production cross sections is studied to probe the $s$-$\bar{s}$ quark asymmetry. The ratio is found to be ${R}_{c}^{±}$= 0.971 ± 0.006 (stat) ± 0.011 (syst). The ratio and cross-section measurements are consistent with the predictions obtained with parton distribution function sets that have a symmetric $s$-$\bar{s}$ sea, indicating that any $s$-$\bar{s}$ asymmetry in the Bjorken-x region relevant for this measurement is small.
Search for a scalar partner of the X ( 3872 ) via ψ ( 3770 ) decays into γ η η ′ and γ π + π − J / ψ
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