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

@article{Bernlochner2020DasID,
  title={Das ist der HAMMER: consistent new physics interpretations of semileptonic decays},
  author={Florian Urs Bernlochner and Stephan Duell and Zoltan Ligeti and Michele Papucci and Dean J. Robinson},
  journal={The European Physical Journal C},
  year={2020}
}
Precise 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… 

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References

SHOWING 1-10 OF 101 REFERENCES

Semileptonic B Decays as a Probe of New Physics

Physics beyond the Standard Model could be measured indirectly, through its effects on Standard Model observables. One place to look for such effects is in the semileptonic decays of B mesons. In

HAMMER: Reweighting tool for simulated data samples

Modern flavour physics experiments, such as Belle II or LHCb, require large samples of generated Monte Carlo events. Monte Carlo events often are processed in a sophisticated chain that includes a

Anatomy of b → c τ ν anomalies

A bstractIn recent times, one of the strongest hints of Physics Beyond the Standard Model (BSM) has been the anomaly in the ratios RD and RD*$$ {R}_{D^{*}} $$ measured in the charged current decays

Maximizing the impact of new physics in b→cτν anomalies

We develop a rigorous, semi-analytical method for maximizing any $b\to c\tau\nu$ observable in the full 20-real-dimensional parameter space of the dimension 6 effective Hamiltonian, given some fixed

B-physics anomalies: a guide to combined explanations

A bstractMotivated by additional experimental hints of Lepton Flavour Universality violation in B decays, both in charged- and in neutral-current processes, we analyse the ingredients necessary to

New physics in the visible final states of B → D(∗)τν

A bstractWe derive compact expressions for the helicity amplitudes of the many-body B → D(∗)(→ DY)τ(→ Xν)ν decays, specifically for X = ℓν or π and Y = π or γ. We include contributions from all ten

Flavor models for B ̄→D (*) τ ν ̄

Marat Freytsis, Zoltan Ligeti, and Joshua T. Ruderman Department of Physics, Harvard University, Cambridge MA, 02138 Ernest Orlando Lawrence Berkeley National Laboratory, University of California,

A global likelihood for precision constraints and flavour anomalies

We present a global likelihood function in the space of dimension-six Wilson coefficients in the Standard Model Effective Field Theory. The likelihood includes contributions from flavour-changing

Resonance chiral Lagrangian currents and $\tau$ decay Monte Carlo

In the present paper we describe the set of form factors for hadronic τ decays based on Resonance Chiral Theory. The technical implementation of the form factors in FORTRAN code is also explained. It

Model-independent description of B ---> pi l nu decays and a determination of |V(ub)|

We propose a new parametrization of the B → π vector form factor f + (q 2 ) as an expansion in powers of a conformal mapping variable, which satisfies unitarity, analyticity and perturbative QCD
...