scholarly journals Time-dependent CP asymmetry in B→K∗γ as a (quasi)null test of the Standard Model

2006 ◽  
Vol 642 (5-6) ◽  
pp. 478-486 ◽  
Author(s):  
Patricia Ball ◽  
Roman Zwicky
Keyword(s):  
Standard Model ◽  
Time Dependent ◽  
Cp Asymmetry ◽  
The Standard Model

scholarly journals K → μ+μ− as a clean probe of short-distance physics

2021 ◽  
Vol 2021 (7) ◽  
Author(s):  
Avital Dery ◽  
Mitrajyoti Ghosh ◽  
Yuval Grossman ◽  
Stefan Schacht
Keyword(s):  
Matrix Element ◽  
Standard Model ◽  
Short Distance ◽  
Time Dependent ◽  
Final States ◽  
Interference Effects ◽  
Fundamental Theory ◽  
Long Distance ◽  
Ckm Matrix ◽  
The Standard Model

Abstract The K → μ+μ− decay is often considered to be uninformative of fundamental theory parameters since the decay is polluted by long-distance hadronic effects. We demonstrate that, using very mild assumptions and utilizing time-dependent interference effects, ℬ(KS → μ+μ−)ℓ=0 can be experimentally determined without the need to separate the ℓ = 0 and ℓ = 1 final states. This quantity is very clean theoretically and can be used to test the Standard Model. In particular, it can be used to extract the CKM matrix element combination $$ \mid {V}_{ts}{V}_{td}\sin \left(\beta +{\beta}_s\right)\mid \approx \mid {A}^2{\lambda}^5\overline{\eta}\mid $$ ∣ V ts V td sin β + β s ∣ ≈ ∣ A 2 λ 5 η ¯ ∣ with hadronic uncertainties below 1%.

scholarly journals Recent Measurements of CP-Violation at the B-Factories

2003 ◽  
Vol 18 (30) ◽  
pp. 2083-2098
Author(s):  
Gabriella Sciolla
Keyword(s):  
Cp Violation ◽  
Standard Model ◽  
New Physics ◽  
Experimental Results ◽  
Time Dependent ◽  
The Standard Model ◽  
Substantial Progress ◽  
Cp Asymmetries

Recent measurements of time-dependent CP-asymmetries at the B-factories have led to substantial progress in our understanding of CP-violation. In this paper, we review some of these experimental results and discuss their implications in the Standard Model and their sensitivity to New Physics.

scholarly journals CP VIOLATION IN SUPERSYMMETRIC THEORIES

2003 ◽  
Vol 18 (10) ◽  
pp. 1697-1732 ◽  
Author(s):  
SHAABAN KHALIL
Keyword(s):  
Dipole Moment ◽  
Cp Violation ◽  
Standard Model ◽  
Electric Dipole ◽  
Dipole Moments ◽  
Neutron Electric Dipole Moment ◽  
Cp Asymmetry ◽  
Electric Dipole Moments ◽  
The Standard Model ◽  
Supersymmetric Theories

We review the present status of the CP violating problem in supersymmetric extensions of the standard model. We analyze the constraints imposed by the experimental limits of the electron, neutron, and mercury electric dipole moments on the supersymmetric CP phases and show that only the scenarios with flavour-off-diagonal CP violation remain attractive. These scenarios require Hermitian Yukawa matrices which naturally arise in models with left–right symmetry or a SU(3) flavour symmetry. In this case, εK and ε′/ε can be saturated by a small non-universality of the soft scalar masses through the gluino and chargino contributions respectively. The model also predicts a strong correlation between A CP (b → sγ) and the neutron electric dipole moment. In this framework, the standard model gives a the leading contribution to the CP asymmetry in B → ψKS decay, while the dominant chargino contribution to this asymmetry is < 0.2. Thus, no constraint is set on the non-universality of this model by the recent BaBar and Belle measurements.

scholarly journals SUPERSYMMETRIC CONTRIBUTIONS TO B→K π IN THE VIEW OF RECENT EXPERIMENTAL RESULTS

2008 ◽  
Vol 23 (05) ◽  
pp. 777-785
Author(s):  
SHAABAN KHALIL
Keyword(s):  
Standard Model ◽  
Branching Ratios ◽  
Experimental Measurements ◽  
Apparent Discrepancy ◽  
Cp Asymmetry ◽  
Essential Requirement ◽  
Electroweak Penguin ◽  
The Standard Model ◽  
Natural Solution ◽  
Cp Asymmetries

Supersymmetric contributions to the branching ratios and CP asymmetries of B→K π decays are analyzed in view of recent experimental measurements. We show that supersymmetry can still provide a natural solution to the apparent discrepancy between the CP asymmetry results and the Standard Model expectations. We emphasize that chargino contributions may enhance the electroweak penguin effects that can resolve to the puzzle of the CP asymmetries of B→Kπ. We also point out that a nonuniversal A-terms is an essential requirement for this solution.

scholarly journals Enhanced CP asymmetries in $$B \rightarrow K \mu ^+ \mu ^-$$

2020 ◽  
Vol 80 (10) ◽  
Author(s):  
Damir Bečirević ◽  
Svjetlana Fajfer ◽  
Nejc Košnik ◽  
Aleks Smolkovič
Keyword(s):  
Cp Violation ◽  
Standard Model ◽  
New Physics ◽  
Beyond The Standard Model ◽  
Cp Asymmetry ◽  
Close Vicinity ◽  
The Standard Model ◽  
Before And After ◽  
Cp Asymmetries

AbstractWe show that the current values of $$R_K^\mathrm {exp}$$ R K exp and $$R_{K^*}^\mathrm {exp}$$ R K ∗ exp can be accommodated by allowing a nonzero New Physics coupling $$\delta C_9^{\mu \mu }$$ δ C 9 μ μ to be complex, both in the scenario in which only $$\delta C_9^{\mu \mu }$$ δ C 9 μ μ is affected, and in the scenario with complex $$\delta C_{9,10}^{\mu \mu }$$ δ C 9 , 10 μ μ satisfying $$\delta C_{9}^{\mu \mu }=-\delta C_{10}^{\mu \mu }$$ δ C 9 μ μ = - δ C 10 μ μ . A presence of the weak CP-violating phase can then be tested by measuring the CP-asymmetry, $$\mathcal {A}_\mathrm {CP}$$ A CP . We show that this asymmetry is enhanced around the peak of each $$c\bar{c}$$ c c ¯ -resonance, and in fact more pronounced in the close vicinity of $$J/\psi $$ J / ψ and $$\psi (2S)$$ ψ ( 2 S ) . Therefore, measuring $$\mathcal {A}_\mathrm {CP}$$ A CP before and after the resonances’ peak could be revelatory of the CP-violation that originates from beyond the Standard Model, or to be a significant constrain when building a realistic scenario of New Physics.

scholarly journals COMPLETE STUDY OF THE SEMILEPTONIC B TO $K_2^*(1430)$ DECAYS IN THE STANDARD MODEL WITH FOURTH GENERATION

2012 ◽  
Vol 27 (25) ◽  
pp. 1250149 ◽  
Author(s):  
MUHAMMAD JUNAID ◽  
MUHAMMAD JAMIL ASLAM ◽  
ISHTIAQ AHMED
Keyword(s):  
Standard Model ◽  
Form Factors ◽  
Experimental Information ◽  
Fourth Generation ◽  
Final State ◽  
Cp Asymmetry ◽  
The Standard Model ◽  
Complete Study ◽  
Lepton Polarization ◽  
State Formula

The [Formula: see text] decays are analyzed in the standard model (SM) extended to fourth generation of quarks (SM4). The decay rate, forward–backward asymmetry, lepton polarization asymmetries, the helicity fractions of the final state [Formula: see text] meson and CP asymmetry are discussed using the form factors calculated in the light-cone sum rules (LCSR) approach. We utilized the constraints on different fourth generation parameters obtained from the experimental information on K, B and D decays and from their recent searches at the ATLAS and CMS experiments to explore their impact on the [Formula: see text] decays. We find that the values of above mentioned physical observables deviate significantly from their minimal SM predications. In the present study, we will also perform the analysis of CP asymmetry in [Formula: see text] decays within SM4, which is one of the most interesting observable in the study of SM4.

SUPERSYMMETRIC CONTRIBUTIONS TO CP ASYMMETRY IN τ-DECAYS

2007 ◽  
Vol 22 (31) ◽  
pp. 6011-6021 ◽  
Author(s):  
D. Delepine ◽  
G. Faisel ◽  
S. Khalil ◽  
M. Shalaby
Keyword(s):  
Cp Violation ◽  
Standard Model ◽  
Parity Violation ◽  
Cp Asymmetry ◽  
The Standard Model ◽  
Order Of Magnitude ◽  
Susy Models ◽  
The Impact

We review the CP violation in the semileptonic |ΔS| = 1 τ-decays in supersymmetric extensions of the standard model (SM). We show that Within SUSY models with conserved R parity, the CP asymmetry of τ → kπν is below the current experimental limits, although it is enhanced by several order of magnitude than the SM results. We also study the impact of the lepton violation terms in SUSY models with R parity violation. We show that the CP asymmetry of τ-decay is enhanced significantly and the current experimental limits obtained by CLEO collaborations can be easily accommodated.

scholarly journals Toward adapted time-dependent magnetospheric models: A simple approach based on tuning the standard model

2009 ◽  
Vol 114 (A1) ◽  
pp. n/a-n/a ◽  
Author(s):  
M. Kubyshkina ◽  
V. Sergeev ◽  
N. Tsyganenko ◽  
V. Angelopoulos ◽  
A. Runov ◽  
...  
Keyword(s):  
Standard Model ◽  
Simple Approach ◽  
Time Dependent ◽  
The Standard Model

scholarly journals Probing QCD dynamics and the standard model with $$ {D}_{(s)}^{+}\to {P}_1^{+}{P}_2^0\gamma $$ decays

2021 ◽  
Vol 2021 (6) ◽  
Author(s):  
Nico Adolph ◽  
Gudrun Hiller
Keyword(s):  
Standard Model ◽  
Branching Ratio ◽  
New Physics ◽  
Resonance Structure ◽  
Cp Asymmetry ◽  
The Standard Model ◽  
Weak Annihilation ◽  
Channel Dependent ◽  
Cabibbo Suppressed ◽  
Three Body

Abstract We compute 10 radiative three-body decays of charged charmed mesons $$ {D}^{+}\to {P}_1^{+}{P}_2^0\gamma $$ D + → P 1 + P 2 0 γ and $$ {D}_s\to {P}_1^{+}{P}_2^0\gamma $$ D s → P 1 + P 2 0 γ , P1,2 = π, K, in leading order QCDF, HHχPT and the soft photon approximation. We work out decay distributions and asymmetries in the standard model and with new physics in the electromagnetic dipole operators. The forward-backward asymmetry is suitable to probe the QCD frameworks, in particular the s-channel dependent weak annihilation contributions in QCDF against the markedly different resonance structure in HHχPT. These studies can be performed with Cabibbo-favored modes Ds → π+π0γ, $$ {D}^{+}\to {\pi}^{+}{\overline{K}}^0\gamma $$ D + → π + K ¯ 0 γ and $$ {D}_s\to {K}^{+}{\overline{K}}^0\gamma $$ D s → K + K ¯ 0 γ with $$ \mathcal{O}\left({10}^{-4}-{10}^{-3}\right)\hbox{-} \mathrm{level} $$ O 10 − 4 − 10 − 3 ‐ level branching ratio, which are standard model-like and induced by different hadronic dynamics. Understanding of the latter can therefore be improved in a data-driven way and sharpens the interpretation of standard model tests. Singly Cabibbo-suppressed modes such as D+ → π+π0γ, Ds → π+K0γ, Ds → K+π0γ with branching ratios within ∼ 10−5–10−4 are sensitive to new physics that can be signalled in the forward-backward asymmetry and in the CP-asymmetry of the rate, ideally in the Dalitz region but also in single differential distributions. Results complement those with neutral D0→ P1P2γ decays.

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