scholarly journals SemileptonicBto scalar meson decays in the standard model with fourth generation

2011 ◽  
Vol 83 (3) ◽  
Author(s):  
M. Jamil Aslam
Keyword(s):  
Standard Model ◽  
Scalar Meson ◽  
Fourth Generation ◽  
Meson Decays ◽  
The Standard Model

scholarly journals STUDY OF RADIATIVE LEPTONIC D MESON DECAYS

2000 ◽  
Vol 15 (34) ◽  
pp. 2087-2103 ◽  
Author(s):  
C. Q. GENG ◽  
C. C. LIH ◽  
WEI-MIN ZHANG
Keyword(s):  
Standard Model ◽  
Quark Model ◽  
D Meson ◽  
Branching Ratios ◽  
Light Front ◽  
Meson Decays ◽  
The Standard Model

We study the radiative leptonic D meson decays of [Formula: see text], [Formula: see text] and D0→ l+l-γ (l=e, μ) within the light front quark model. In the standard model, we find that the decay branching ratios of [Formula: see text], [Formula: see text] and [Formula: see text] are 6.9×10-6 (7.7×10-5), 2.5×10-5 (2.6×10-4), and 6.0×10-6 (3.2×10-4), and that of D0→l+l-γ (l=e, μ) and [Formula: see text] are 6.3×10-11 and 2.7×10-16, respectively.

scholarly journals Generic one-loop matching conditions for rare meson decays

2021 ◽  
Vol 2021 (7) ◽  
Author(s):  
Fady Bishara ◽  
Joachim Brod ◽  
Martin Gorbahn ◽  
Ulserik Moldanazarova
Keyword(s):  
Standard Model ◽  
Flavour Changing Neutral Currents ◽  
Neutral Currents ◽  
Matching Conditions ◽  
Meson Decays ◽  
Effective Lagrangian ◽  
The Standard Model

Abstract Leptonic and semileptonic meson decays that proceed via flavour-changing neutral currents provide excellent probes of physics of the standard model and beyond. We present explicit results for the Wilson coefficients of the weak effective Lagrangian for these decays in any perturbative model in which these processes proceed via one-loop contributions. We explicitly show that our results are finite and gauge independent, and provide Mathematica code that implements our results in an easily usable form.

scholarly journals A COMPARATIVE STUDY ON B →K*ℓ+ ℓ- AND $B \to K_0^\ast (1430) \ell^+ \ell^-$ DECAYS IN THE SUPERSYMMETRIC MODELS

2011 ◽  
Vol 26 (12) ◽  
pp. 901-911 ◽  
Author(s):  
V. BASHIRY ◽  
M. BAYAR ◽  
K. AZIZI
Keyword(s):  
Standard Model ◽  
Comparative Study ◽  
Scalar Meson ◽  
Branching Ratio ◽  
Mass Region ◽  
P Wave ◽  
Muon Channel ◽  
The Standard Model ◽  
Model Predictions ◽  
Supersymmetric Models

In this paper, we compare the branching ratio and rate difference of electron channel to muon channel of [Formula: see text] and B →K*ℓ+ℓ- decays, where [Formula: see text] is the p-wave scalar meson, in the supersymmetric models. MSSM with R parity is considered since considerable deviation from the standard model predictions can be obtained in B→Xs ℓ-ℓ+. Taking CQ1 and CQ2 about one which is consistent with the B→K*μ+μ- rate at low dileptonic invariant mass region (1 ≤ q2 ≤ 6 GeV 2). It is found that, firstly, the [Formula: see text] decay is measurable at LHC, secondly, in comparison with B →K*ℓ+ ℓ- decay a greater deviation in the [Formula: see text] decay can be seen. Measurement of these observables for the semileptonic rare [Formula: see text], in particular, at low q2 region can give valuable information about the nature of interactions within Standard Model or beyond.

scholarly journals Constraints on a Fourth Generation of Fermions from Higgs Boson Searches

2013 ◽  
Vol 2013 ◽  
pp. 1-13 ◽  
Author(s):  
Alexander Lenz
Keyword(s):  
Higgs Boson ◽  
Standard Model ◽  
Higgs Doublet ◽  
Current Status ◽  
Fourth Generation ◽  
The Past ◽  
The Standard Model

We review the past and current status of the extension of the standard model (SM) by a fourth generation of fermions. In particular the new results for Higgs boson searches at the LHC and at Tevatron exclude the possibility of having simply a perturbative fourth generation of fermions with one Higgs doublet (SM4). We also briefly mention more complicated extensions of the SM4, which are not yet excluded, like adding in addition another Higgs doublet to the SM4.

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.

scholarly journals The Fourth Generation t-prime in Extensions of the Standard Model

2010 ◽  
Author(s):  
Erin De Pree ◽  
Gardner Marshall ◽  
Marc Sher ◽  
George Alverson ◽  
Pran Nath ◽  
...  
Keyword(s):  
Standard Model ◽  
Fourth Generation ◽  
The Standard Model

scholarly journals (g − 2)μ versus K → π + Emiss induced by the (B − L)23 boson

2021 ◽  
Vol 2021 (4) ◽  
Author(s):  
Zhaofeng Kang ◽  
Yoshihiro Shigekami
Keyword(s):  
Cp Violation ◽  
Standard Model ◽  
Neutral Current ◽  
Tree Level ◽  
Meson Decays ◽  
Loop Level ◽  
Flavor Changing ◽  
The Standard Model ◽  
Flavor Changing Neutral Current

Abstract To address the long-standing (g − 2)μ anomaly via a light boson, in ref. [1] we proposed to extend the standard model (SM) by the local (B − L)23, under which only the second and third generations of fermions are charged. It predicts an invisible Z′ with mass $$ \mathcal{O}(100) $$ O 100 MeV, and moreover it has flavor-changing neutral current (FCNC) couplings to the up-type quarks at tree level. Such a Z′, via KL→ π0 + Z′(→$$ v\overline{v} $$ v v ¯ ) at loop level, may be a natural candidate to account for the recent KOTO anomaly. In this article, we investigate this possibility, to find that Z′ can readily do this job if it is no longer responsible for the (g − 2)μ anomaly. We further find that both anomalies can be explained with moderate tuning of the CP violation, but may contradict the B meson decays.

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