CAN WE RELATE TIME-REVERSAL VIOLATION TO NEW PHYSICS PROCESSES IN WEAK HADRONIC DECAYS?

2013 ◽  
Vol 22 (03) ◽  
pp. 1330006 ◽  
Author(s):  
Z. J. AJALTOUNI ◽  
E. DI SALVO
Keyword(s):  
Experimental Data ◽  
Cp Violation ◽  
Standard Model ◽  
Time Reversal ◽  
Review Paper ◽  
New Physics ◽  
Hadronic Decays ◽  
Beyond The Standard Model ◽  
Weak Decays ◽  
The Standard Model

This review paper stresses the possible connection between time-reversal violation and new physics processes beyond the standard model. In particular, this violation is proposed as an alternative to CP violation in the search for such unkown processes. Emphasis is put on the weak decays of heavy hadrons, especially beauty ones. Specific methods for extracting useful parameters from experimental data are elaborated in order to test TR symmetry. These methods could be used successfully in the analysis of the LHC data.

scholarly journals INTERFERENCE EFFECTS, TIME REVERSAL VIOLATION AND SEARCH FOR NEW PHYSICS IN HADRONIC WEAK DECAYS

2012 ◽  
Vol 27 (16) ◽  
pp. 1250086 ◽  
Author(s):  
Z. J. AJALTOUNI ◽  
E. DI SALVO
Keyword(s):  
Standard Model ◽  
Decay Width ◽  
Time Reversal ◽  
New Physics ◽  
Beyond The Standard Model ◽  
Interference Effects ◽  
Decay Channels ◽  
Weak Decays ◽  
The Standard Model ◽  
Almost All

We propose some methods for studying hadronic sequential two-body decays involving more spinning particles. It relies on the analysis of T-odd and T-even asymmetries, which are related to interference terms. The latter asymmetries turn out to be as useful as the former ones in inferring time reversal violating observables; these in turn may be sensitive, under some particular conditions, to possible contributions beyond the standard model. Our main result is that one can extract such observables even after integrating the differential decay width over almost all of the available angles. Moreover we find that the correlations based exclusively on momenta are quite general, since they provide as much information as those involving one or more spins. We generalize some methods already proposed in the literature for particular decay channels, but we also pick out a new kind of time reversal violating observables. Our analysis could be applied, for example, to data of LHCb experiment.

scholarly journals RARE DECAYS AND CP VIOLATION BEYOND THE STANDARD MODEL

2006 ◽  
Vol 21 (08n09) ◽  
pp. 1738-1749 ◽  
Author(s):  
LUCA SILVESTRINI
Keyword(s):  
Cp Violation ◽  
Standard Model ◽  
Rare Decays ◽  
New Physics ◽  
Beyond The Standard Model ◽  
Unitarity Triangle ◽  
Minimal Flavour Violation ◽  
The Standard Model ◽  
The Status ◽  
Flavour Violation

We review the status of rare decays and CP violation in extensions of the Standard Model. We analyze the determination of the unitarity triangle and the model-independent constraints on new physics that can be derived from this analysis. We find stringent bounds on new contributions to [Formula: see text] and [Formula: see text] mixing, pointing either to models of minimal flavour violation or to models with new sources of flavour and CP violation in b → s transitions. We discuss the status of the universal unitarity triangle in minimal flavour violation, and study rare decays in this class of models. We then turn to supersymmetric models with nontrivial mixing between second and third generation squarks, discuss the present constraints on this mixing and analyze the possible effects on CP violation in b → s nonleptonic decays and on [Formula: see text] mixing. We conclude presenting an outlook on Lepton-Photon 2009.

scholarly journals Status of Charm Flavor Physics

2006 ◽  
Vol 21 (27) ◽  
pp. 5381-5403 ◽  
Author(s):  
Ian Shipsey
Keyword(s):  
Cp Violation ◽  
Standard Model ◽  
Flavor Physics ◽  
Form Factors ◽  
New Physics ◽  
Model Description ◽  
Beyond The Standard Model ◽  
Physics Program ◽  
The Standard Model ◽  
The Status

The role of charm in testing the Standard Model description of quark mixing and CP violation through measurements of lifetimes, decay constants and semileptonic form factors is reviewed. Together with Lattice QCD, charm has the potential this decade to maximize the sensitivity of the entire flavor physics program to new physics and pave the way for understanding physics beyond the Standard Model at the LHC in the coming decade. The status of indirect searches for physics beyond the Standard Model through charm mixing, CP-violation and rare decays is also reported.

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 NEW PHYSICS SIGNALS THROUGH CP VIOLATION IN B→ρπ

2004 ◽  
Vol 19 (31) ◽  
pp. 5477-5484
Author(s):  
VÉRONIQUE PAGÉ
Keyword(s):  
Cp Violation ◽  
Standard Model ◽  
Dalitz Plot ◽  
New Physics ◽  
Beyond The Standard Model ◽  
Good Efficiency ◽  
Qcd Factorization ◽  
Plot Analysis ◽  
The Standard Model

We describe here a method for detecting physics beyond the standard model via CP violation in B→ρπ decays. Using a Dalitz-plot analysis to obtain α, along with an analytical extraction of the various tree (T) and penguin (P) amplitudes, we obtain a criterion for the absence of new physics (NP). This criterion involves the comparison of the measured |P/T| ratio with its value as predicted by QCD factorization. We show that the detection of NP via this method has a good efficiency when compared with the corresponding technique using B→ππ decays.

scholarly journals Polarization in (quasi-)two-body decays and new physics

2019 ◽  
Vol 79 (12) ◽  
Author(s):  
Z. J. Ajaltouni ◽  
E. Di Salvo
Keyword(s):  
Time Reversal ◽  
New Physics ◽  
Beyond The Standard Model ◽  
Covariant Formalism ◽  
Final State ◽  
Leptonic Decays ◽  
Weak Decays ◽  
The Standard Model ◽  
Final State Interactions ◽  
Major Attention

AbstractWe consider two-body and quasi-two-body decays of the type $$f_1 \rightarrow f_2 B$$f1→f2B, where $$f_1$$f1 and $$f_2$$f2 are spin-1/2 fermions and B a spin-0 or spin-1 boson. After recalling the non-covariant formalism for decay amplitudes, we derive the expression of the differential decay width and of the polarizations of the final spinning particles, both on- and off-shell. We find an intriguing geometrical interpretation of the results about the polarization. We also illustrate some methods for measuring the polarizations of the resonances and for optimizing data analysis. Then we propose applications to semi-leptonic weak decays, with a major attention to the T-odd component of the polarization; this may help to find, simultaneously, possible time-reversal violations and hints to physics beyond the standard model. We suggest also a CPT test. Last, we discuss some T-odd observables for the production process of $$f_1$$f1 and for the study of the strong final state interactions of non-leptonic decays.

scholarly journals $\bar{B}\rightarrow X_s\gamma$ in the μνSSM

2014 ◽  
Vol 29 (38) ◽  
pp. 1450196 ◽  
Author(s):  
Hai-Bin Zhang ◽  
Guo-Hui Luo ◽  
Tai-Fu Feng ◽  
Shu-Min Zhao ◽  
Tie-Jun Gao ◽  
...  
Keyword(s):  
Experimental Data ◽  
Standard Model ◽  
Rare Decay ◽  
New Physics ◽  
Majorana Neutrino ◽  
Decay Process ◽  
Neutrino Masses ◽  
Beyond The Standard Model ◽  
Seesaw Mechanism ◽  
The Standard Model

The μνSSM, one of supersymmetric extensions beyond the Standard Model, introduces three singlet right-handed neutrino superfields to solve the μ problem and can generate three tiny Majorana neutrino masses through the seesaw mechanism. In this paper, we investigate the rare decay process [Formula: see text] in the μνSSM, under a minimal flavor violating assumption for the soft breaking terms. Constrained by the SM-like Higgs with mass around 125 GeV, the numerical results show that the new physics can fit the experimental data for [Formula: see text] and further constrain the parameter space.

scholarly journals STATUS OF CHARM FLAVOR PHYSICS

2005 ◽  
Vol 20 (22) ◽  
pp. 5119-5132 ◽  
Author(s):  
I. SHIPSEY
Keyword(s):  
Cp Violation ◽  
Standard Model ◽  
Flavor Physics ◽  
Form Factors ◽  
New Physics ◽  
Model Description ◽  
Beyond The Standard Model ◽  
Physics Program ◽  
The Standard Model ◽  
The Status

The role of charm in testing the Standard Model description of quark mixing and CP violation through measurements of lifetimes, decay constants and semileptonic form factors is reviewed. Together with Lattice QCD, charm has the potential this decade to maximize the sensitivity of the entire flavor physics program to new physics. and pave the way for understanding physics beyond the Standard Model at the LHC in the coming decade. The status of indirect searches for physics beyond the Standard Model through charm mixing, CP-violation and rare decays is also reported.

scholarly journals DIRECT CP VIOLATION AND NEW PHYSICS EFFECTS IN THE DECAY MODE B+→ϕK+

2004 ◽  
Vol 19 (25) ◽  
pp. 1903-1918 ◽  
Author(s):  
ANJAN K. GIRI ◽  
RUKMANI MOHANTA
Keyword(s):  
Cp Violation ◽  
Standard Model ◽  
Decay Mode ◽  
Percent Level ◽  
New Physics ◽  
Supersymmetric Model ◽  
Beyond The Standard Model ◽  
Cp Asymmetry ◽  
Penguin Diagram ◽  
The Standard Model

We study the direct CP violation effect in the decay mode B+→ϕK+. This decay mode is dominated by the loop induced [Formula: see text] penguin diagram with a tiny contribution from the annihilation diagram. Therefore, the standard model expectation of direct CP violation is negligibly small. Using QCD factorization approach we find the CP asymmetry in the standard model to be at percent level. We consider then two scenarios beyond the standard model, the model with an extra vector-like down quark (VLDQ) and the R-parity violating supersymmetric model (RPV) and show that the direct CP violating asymmetry in B+→ϕK+ could be as large as ~ 85% (70%) in VLDQ (RPV) model.

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