scholarly journals Discerning new physics in charm meson leptonic and semileptonic decays

2015 ◽  
Vol 91 (9) ◽  
Author(s):  
Svjetlana Fajfer ◽  
Ivan Nišandžić ◽  
Urša Rojec
Keyword(s):  
Semileptonic Decays ◽  
New Physics ◽  
Charm Meson

Looking for new physics in leptonic and semileptonic decays of B-meson

2017 ◽  
Vol 14 (5) ◽  
pp. 669-676 ◽  
Author(s):  
M. A. Ivanov ◽  
J. G. Körner ◽  
C. T. Tran
Keyword(s):  
B Meson ◽  
Semileptonic Decays ◽  
New Physics

CHARM MIXING AND CP VIOLATION AT B-FACTORIES

2014 ◽  
Vol 35 ◽  
pp. 1460413
Author(s):  
GIANLUIGI CIBINETTO ◽  
Keyword(s):  
Cp Violation ◽  
Standard Model ◽  
New Physics ◽  
Ratio Analysis ◽  
Charm Meson ◽  
Final State ◽  
Charm Decays ◽  
Decay Modes ◽  
The Standard Model ◽  
Model Predictions

CP violation in charm decays is expected to be very small in the Standard Model, at the level of 0.1% or less. A sizable excess of CP violation with respect to the Standard Model predictions could be a signature of new physics. We report on recent searches for CP violation in charm meson decays at BABAR and Belle experiments. In particular we report a lifetime ratio analysis of D0 → K+K−, π+π− with respect to D0 → K−π+ decays, which is sensitive to [Formula: see text] mixing and CP violation. We report also on searches for CPV in the 3-body D+ → K+K−π+ decay and for decay modes with a [Formula: see text] in the final state, such as [Formula: see text].

scholarly journals Das ist der HAMMER: consistent new physics interpretations of semileptonic decays

2020 ◽  
Vol 80 (9) ◽  
Author(s):  
Florian U. Bernlochner ◽  
Stephan Duell ◽  
Zoltan Ligeti ◽  
Michele Papucci ◽  
Dean J. Robinson
Keyword(s):  
Monte Carlo ◽  
Experimental Analysis ◽  
Semileptonic Decays ◽  
Software Tool ◽  
Theoretical Models ◽  
New Physics ◽  
Matrix Elements ◽  
Standard Practice ◽  
Highly Sensitive ◽  
Self Consistent

AbstractPrecise measurements of $$b\rightarrow c\tau \bar{\nu }$$ b → c τ ν ¯ decays require large resource-intensive Monte Carlo (MC) samples, which incorporate detailed simulations of detector responses and physics backgrounds. Extracted parameters may be highly sensitive to the underlying theoretical models used in the MC generation. Because new physics (NP) can alter decay distributions and acceptances, the standard practice of fitting NP Wilson coefficients to SM-based measurements of the $$R(D^{(*)})$$ R ( D ( ∗ ) ) ratios can be biased. The newly developed software tool enables efficient reweighting of MC samples to arbitrary NP scenarios or to any hadronic matrix elements. We demonstrate how allows avoidance of biases through self-consistent fits directly to the NP Wilson coefficients. We also present example analyses that demonstrate the sizeable biases that can otherwise occur from naive NP interpretations of SM-based measurements. The library is presently interfaced with several existing experimental analysis frameworks and we provide an overview of its structure.

scholarly journals B¯c→ηc , B¯c→J/ψ and B¯→D(*) semileptonic decays including new physics

2020 ◽  
Vol 102 (9) ◽  
Author(s):  
Neus Penalva ◽  
Eliecer Hernández ◽  
Juan Nieves
Keyword(s):  
Semileptonic Decays ◽  
New Physics

scholarly journals Experimental status of LNU in B decays in LHCb

2019 ◽  
Author(s):  
Sean Benson
Keyword(s):  
Standard Model ◽  
Semileptonic Decays ◽  
Experimental Tests ◽  
New Physics ◽  
B Decays ◽  
Experimental Status ◽  
Lepton Universality ◽  
Highly Sensitive ◽  
The Standard Model ◽  
Charged Leptons

In the Standard Model, the three charged leptons are identical copies of each other, apart from mass differences. Experimental tests of this feature in semileptonic decays of -hadrons are highly sensitive to New Physics particles which preferentially couple to the 2nd and 3rd generations of leptons. A review of the latest lepton universality tests in semileptonic transitions at is reported.

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