T. Feldmann

activity

19942023

most citedSoft-collinear effective theory and heavy-to-light currents beyond leading power

655 citations · 6.1k across the 75 of their papers we have counts for

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74 papers · 1 filter

hep-ph2023★ 1 cited

Strange-quark mass effects in the $B_{s}$ meson's light-cone distribution amplitude

Thorsten Feldmann, Philip Lüghausen, Nicolas Seitz

We investigate the differences between the light-cone distribution amplitudes (LCDAs) of $B_{s}$ mesons and $B_{q}$ mesons (with $q = u, d$ ) induced by a non-vanishing strange-quark mass…

hep-ph2022★ 14 cited

On the contribution of the electromagnetic dipole operator $O_{7}$ to the $B ˉ_{s} \to μ^{+} μ^{-}$ decay amplitude

Thorsten Feldmann, Nico Gubernari, Tobias Huber +1

We construct a factorization theorem that allows to systematically include QCD corrections to the contribution of the electromagnetic dipole operator in the effective weak Hamilton…

hep-ph2022★ 24 cited

Muon-electron backward scattering: a prime example for endpoint singularities in SCET

Guido Bell, Philipp Böer, Thorsten Feldmann

We argue that energetic muon-electron scattering in the backward direction can be viewed as a template case to study the resummation of large logarithms related to endpoint diverge…

hep-ph2022★ 18 cited

Systematic Parametrization of the Leading $B$ -meson Light-Cone Distribution Amplitude

Thorsten Feldmann, Philip Lüghausen, Danny van Dyk

We propose a parametrization of the leading $B$ -meson light-cone distribution amplitude (LCDA) in heavy-quark effective theory (HQET). In position space, it uses a conformal transf…

hep-ph2021

Angular Distributions in Rare $b$ Decays

Thorsten Feldmann

We give a brief overview of phenomenological developments in the analysis of angular observables for exclusive decay modes of $B$ mesons and $Λ_{b}$ baryons, with focus on recent res…

hep-ph2020★ 31 cited

Constraining flavour patterns of scalar leptoquarks in the effective field theory

Marzia Bordone, Oscar Cata, Thorsten Feldmann +1

We investigate the viability of extending the Standard Model with $S_{1}$ and $S_{3}$ scalar leptoquarks when the flavour structure is parametrized in terms of Froggatt-Nielsen charges…

hep-ph2019★ 54 cited

Effective Theory Approach to New Physics with Flavour: General Framework and a Leptoquark Example

Marzia Bordone, Oscar Catà, Thorsten Feldmann

Extending the Standard Model with higher-dimensional operators in an effective-field-theory (EFT) approach provides a systematic framework to study new-physics (NP) effects from a…

hep-ph2018★ 14 cited

Revisiting $B \to π π ℓ ν$ at Large Dipion Masses

Thorsten Feldmann, Danny van Dyk, K. Keri Vos

We revisit QCD factorization of $B \to π π$ form factors at large dipion masses, by deriving new constraints based on the analyticity properties of these objects. We then propose a p…

hep-ph2017★ 31 cited

$D \to ρ ℓ^{+} ℓ^{-}$ Decays in the QCD Factorization Approach

Thorsten Feldmann, Bastian Mueller, Dirk Seidel

We consider rare semileptonic decays of a heavy $D$ -meson into a light vector meson in the framework of QCD factorization. In contrast to the corresponding $B$ -meson decays, the na…

hep-ph2016★ 6 cited

Lepton-flavour violation in a Pati-Salam model with gauged flavour symmetry

Thorsten Feldmann, Christoph Luhn, Paul Moch

Combining Pati-Salam (PS) and flavour symmetries in a renormalisable setup, we devise a scenario which produces realistic masses for the charged leptons. Flavour-symmetry breaking…

hep-ph2016★ 30 cited

QCD Factorization for $B \to π π ℓ ν$ Decays at Large Dipion Masses

Philipp Böer, Thorsten Feldmann, Danny van Dyk

We introduce a factorization formula for semi-leptonic $b \to u$ transitions in the exclusive decay mode $B^{-} \to π^{+} π^{-} ℓ^{-} ν ˉ_{ℓ}$ in the limit of large pion energies and la…

hep-ph2015★ 2 cited

Renormalization Group Evolution of Flavour Invariants

Thorsten Feldmann, Thomas Mannel, Steffen Schwertfeger

The fermion spectrum in the Standard Model (SM) exhibits hierarchical structures between the eigenvalues of the Yukawa matrices which determine the fermion masses, as well as certa…

hep-ph2015★ 1 cited

Angular Analysis of New Physics Operators in polarized $τ \to 3 ℓ$ Decays

Robin Brüser, Thorsten Feldmann, Bjorn O. Lange +2

In a bottom-up approach we investigate lepton-flavour violating processes $τ \to 3 ℓ$ that are mediated by New Physics encoded in effective-theory operators of dimension six. Whi…

hep-ph2015★ 4 cited

Combining Pati-Salam and Flavour Symmetries

Thorsten Feldmann, Florian Hartmann, Wolfgang Kilian +1

We construct an extension of the Standard Model (SM) which is based on grand unification with Pati-Salam symmetry. The setup is supplemented with the idea of spontaneous flavour sy…

hep-ph2015★ 15 cited

Analyzing $b \to u$ transitions in semileptonic $B ˉ_{s} \to K^{*+} (\to K π) ℓ^{-} ν ˉ_{ℓ}$ decays

Thorsten Feldmann, Bastian Müller, Danny van Dyk

We study the semileptonic decay $B ˉ_{s} \to K^{*+} ℓ^{-} ν ˉ_{ℓ}$ , which is induced by $b \to u ℓ^{-} ν ˉ_{ℓ}$ transitions at the quark level. We take into account the sta…

hep-ph2014★ 82 cited

Angular Analysis of the Decay $Λ_{b} \to Λ (\to N π) ℓ^{+} ℓ^{-}$

Philipp Böer, Thorsten Feldmann, Danny van Dyk

We study the differential decay rate for the rare $Λ_{b} \to Λ (\to N π) ℓ^{+} ℓ^{-}$ transition, including a determination of the complete angular distribution, assuming unpolarized…

hep-ph2014★ 2 cited

Non-Leptonic Heavy Meson Decays - Theory Status

Thorsten Feldmann

I briefly review the status and recent progress in the theoretical understanding of non-leptonic decays of beauty and charm hadrons. Focusing on a personal selection of topics, thi…

hep-ph2014★ 52 cited

B-Meson Light-Cone Distribution Amplitude: Perturbative Constraints and Asymptotic Behaviour in Dual Space

Thorsten Feldmann, Bjorn O. Lange, Yu-Ming Wang

Based on the dual representation in terms of the recently established eigenfunctions of the evolution kernel in heavy-quark effective theory, we investigate the description of the…

hep-ph2013★ 61 cited

Disentangling the Decay Observables in $B^{-} \to π^{+} π^{-} ℓ^{-} ν ˉ_{ℓ}$

Sven Faller, Thorsten Feldmann, Alexander Khodjamirian +2

We study the semileptonic $b \to u$ transition in the decay mode $B^{-} \to π^{+} π^{-} ℓ^{-} ν ˉ_{ℓ}$ . We define $B \to π π$ form factors in the helicity basis, and study their properties…

hep-ph2013★ 123 cited

Light-Cone Distribution Amplitudes for Heavy-Quark Hadrons

Guido Bell, Thorsten Feldmann, Yu-Ming Wang +1

We construct parametrizations of light-cone distribution amplitudes (LCDAs) for B-mesons and Lambda_b-baryons that obey various theoretical constraints, and which are simple to use…

hep-ph2012★ 3 cited

Proceedings of the 2nd Workshop on Flavor Symmetries and Consequences in Accelerators and Cosmology (FLASY12)

I. de Medeiros Varzielas, C. Hambrock, G. Hiller +66

These are the proceedings of the 2nd Workshop on Flavor Symmetries and Consequences in Accelerators and Cosmology, held 30 June 2012 - 4 July 2012, Dortmund, Germany.

hep-ph2012★ 83 cited

Repercussions of Flavour Symmetry Breaking on CP Violation in D-Meson Decays

Thorsten Feldmann, Soumitra Nandi, Amarjit Soni

We investigate to what extent the recently measured value for a non-vanishing direct CP asymmetry in D0 -> K+ K- and D0 -> pi+ pi- decays can be accommodated in the Standard Model…

hep-ph2011★ 119 cited

Form Factors for Lambda_b -> Lambda Transitions in SCET

Thorsten Feldmann, Matthew W. Y. Yip

We present a systematic discussion of Lambda_b -> Lambda transition form factors in the framework of soft-collinear effective theory (SCET). The universal soft form factor, which e…

hep-ph2011

Lepton Flavour Violation Theory

Thorsten Feldmann

I discuss theoretical and phenomenological aspects of flavour violation in charged lepton transitions. This includes minimal extensions of the Standard Model within effective-theor…

Strange-quark mass effects in the Bs​ meson's light-cone distribution amplitude

On the contribution of the electromagnetic dipole operator O7​ to the Bˉs​→μ+μ− decay amplitude

Muon-electron backward scattering: a prime example for endpoint singularities in SCET

Systematic Parametrization of the Leading B-meson Light-Cone Distribution Amplitude

Angular Distributions in Rare b Decays

Constraining flavour patterns of scalar leptoquarks in the effective field theory

Effective Theory Approach to New Physics with Flavour: General Framework and a Leptoquark Example

Revisiting B→ππℓν at Large Dipion Masses

D→ρℓ+ℓ− Decays in the QCD Factorization Approach

Lepton-flavour violation in a Pati-Salam model with gauged flavour symmetry

QCD Factorization for B→ππℓν Decays at Large Dipion Masses

Renormalization Group Evolution of Flavour Invariants

Angular Analysis of New Physics Operators in polarized τ→3ℓ Decays

Combining Pati-Salam and Flavour Symmetries

Analyzing b→u transitions in semileptonic Bˉs​→K∗+(→Kπ)ℓ−νˉℓ​ decays

Angular Analysis of the Decay Λb​→Λ(→Nπ)ℓ+ℓ−

Non-Leptonic Heavy Meson Decays - Theory Status

B-Meson Light-Cone Distribution Amplitude: Perturbative Constraints and Asymptotic Behaviour in Dual Space

Disentangling the Decay Observables in B−→π+π−ℓ−νˉℓ​

Light-Cone Distribution Amplitudes for Heavy-Quark Hadrons

Proceedings of the 2nd Workshop on Flavor Symmetries and Consequences in Accelerators and Cosmology (FLASY12)

Repercussions of Flavour Symmetry Breaking on CP Violation in D-Meson Decays

Form Factors for Lambda_b -> Lambda Transitions in SCET

Lepton Flavour Violation Theory

Strange-quark mass effects in the $B_{s}$ meson's light-cone distribution amplitude

On the contribution of the electromagnetic dipole operator $O_{7}$ to the $B ˉ_{s} \to μ^{+} μ^{-}$ decay amplitude

Systematic Parametrization of the Leading $B$ -meson Light-Cone Distribution Amplitude

Angular Distributions in Rare $b$ Decays

Revisiting $B \to π π ℓ ν$ at Large Dipion Masses

$D \to ρ ℓ^{+} ℓ^{-}$ Decays in the QCD Factorization Approach

QCD Factorization for $B \to π π ℓ ν$ Decays at Large Dipion Masses

Angular Analysis of New Physics Operators in polarized $τ \to 3 ℓ$ Decays

Analyzing $b \to u$ transitions in semileptonic $B ˉ_{s} \to K^{*+} (\to K π) ℓ^{-} ν ˉ_{ℓ}$ decays

Angular Analysis of the Decay $Λ_{b} \to Λ (\to N π) ℓ^{+} ℓ^{-}$

Disentangling the Decay Observables in $B^{-} \to π^{+} π^{-} ℓ^{-} ν ˉ_{ℓ}$