scholarly journals Lepton polarization asymmetries of H ->    + - decay in the Standard Model

2014 ◽  
Vol 2014 (9) ◽  
pp. 93B03-0
Author(s):  
R. Akbar ◽  
I. Ahmed ◽  
M. J. Aslam
Keyword(s):  
Standard Model ◽  
The Standard Model ◽  
Lepton Polarization

Study of B̄s → ϕμ+μ− decays in the G(211) model and vector leptoquark model

2017 ◽  
Vol 32 (25) ◽  
pp. 1750155 ◽  
Author(s):  
Shuai-Wei Wang
Keyword(s):  
Standard Model ◽  
Large Deviation ◽  
Branching Fraction ◽  
New Physics ◽  
Decay Process ◽  
Angular Distributions ◽  
The Standard Model ◽  
Lepton Polarization ◽  
Text Model

We study [Formula: see text] decay in the [Formula: see text] model and vector leptoquark model, respectively. We consider the effects of these two new physics (NP) models on some measured physical observables of this decay process, such as the differential branching fraction and the angular distributions. We find that the large deviation of the differential branching fraction between the measurement and the Standard Model (SM) prediction can be explained in these two NP models. However, we found that not all observables of the double-lepton polarization asymmetries are sensitive to the contributions of these NP models.

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.

Precision Tau and Electron Neutral Current Asymmetry Measurements from the Tau Polarization at OPAL

2001 ◽  
Vol 16 (supp01b) ◽  
pp. 555-557
Author(s):  
◽  
Kevin Graham
Keyword(s):  
Standard Model ◽  
Neutral Current ◽  
Opal Detector ◽  
Lepton Universality ◽  
The Standard Model ◽  
Lepton Polarization ◽  
Lepton Decays ◽  
Integrated Luminosity

A measurement of the τ lepton polarization and forward-backward asymmetry near the Z0 resonance using the OPAL detector is described. The measurement is based on analysis of [Formula: see text], [Formula: see text], τ → π (K) ντ, τ → ρ ντ and τ → a1 ντ decays from a sample of 144, 810 e + e - → τ+ τ- candidates corresponding to an integrated luminosity of 151 pb-1. Assuming that the τ lepton decays according to V - A theory, we measure the average τ polarization near [Formula: see text] to be <Pτ> = (-14.11 ± 0.73 ± 0.56)% and the τ polarization forward-backward asymmetry to be [Formula: see text], where the first error is statistical and the second systematic. These results are consistent with the hypothesis of lepton universality and, within the context of the Standard Model, combine to produce [Formula: see text].

Investigating the 331-Z′ mediated FCNC effects on b → sμ+μ− transitions

2018 ◽  
Vol 33 (21) ◽  
pp. 1850125 ◽  
Author(s):  
Soram Robertson Singh ◽  
Barilang Mawlong ◽  
Ritu D’cruz
Keyword(s):  
Standard Model ◽  
Neutral Current ◽  
Branching Ratio ◽  
Decay Modes ◽  
Flavor Changing ◽  
The Standard Model ◽  
Flavor Changing Neutral Current ◽  
Lepton Polarization ◽  
Text Model ◽  
New Formula

The rare semileptonic [Formula: see text] and [Formula: see text] decay modes mediated by the [Formula: see text] transition are studied in this paper. We analyze observables such as the differential branching ratio, lepton polarization asymmetry and forward–backward asymmetry within the standard model in the low [Formula: see text] region. We then perform an analysis of the same modes within the 331 or [Formula: see text] model in which a new heavy [Formula: see text] boson contributes. The effects of the [Formula: see text]-mediated flavor-changing neutral current (FCNC) transitions on these modes are investigated by varying the mass [Formula: see text] and the model parameter [Formula: see text]. The new [Formula: see text] couplings are constrained by flavor observables of [Formula: see text] mixing and branching ratio of [Formula: see text]. We find that for some values of these couplings, the observables are quite sensitive to [Formula: see text] effects and deviations from Standard Model can be large.

scholarly journals DOUBLE-LEPTON POLARIZATION ASYMMETRIES IN B → K1l+l- DECAY IN UNIVERSAL EXTRA DIMENSION

2012 ◽  
Vol 27 (08) ◽  
pp. 1250036
Author(s):  
B. B. ŞIRVANLI
Keyword(s):  
Standard Model ◽  
Extra Dimension ◽  
Model Parameters ◽  
Experimental Measurements ◽  
Beyond The Standard Model ◽  
Universal Extra Dimension ◽  
The Standard Model ◽  
Lepton Polarization ◽  
Theoretical Results

The double-lepton polarization asymmetries for the exclusive B → K1l+l- transition is studied in the universal extra dimension. It is shown that most of the double-lepton polarization asymmetries are sensitive to the model parameters. Any experimental measurements on double-lepton polarizations and their comparison with theoretical results can give valuable information on the physics beyond the standard model.

Indirect measurements in micro-space with the EM

1995 ◽  
Vol 53 ◽  
pp. 598-599
Author(s):  
Sterling P. Newberry
Keyword(s):  
Electron Microscope ◽  
Standard Model ◽  
Particle Physics ◽  
Information Storage ◽  
Storage Space ◽  
Indirect Measurements ◽  
Storage And Retrieval ◽  
Adequate Information ◽  
Compelling Reason ◽  
The Standard Model

At the 1958 meeting of our society, then known as EMSA, the author introduced the concept of microspace and suggested its use to provide adequate information storage space and the use of electron microscope techniques to provide storage and retrieval access. At this current meeting of MSA, he wishes to suggest an additional use of the power of the electron microscope.The author has been contemplating this new use for some time and would have suggested it in the EMSA fiftieth year commemorative volume, but for page limitations. There is compelling reason to put forth this suggestion today because problems have arisen in the “Standard Model” of particle physics and funds are being greatly reduced just as we need higher energy machines to resolve these problems. Therefore, any techniques which complement or augment what we can accomplish during this austerity period with the machines at hand is worth exploring.

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