Preprints 2022  

Preprints 2021  

Preprints 2020  

 QFET-2020-01 Generic dijet soft functions at two-loop order: uncorrelated emissions
 Author:   Guido Bell, Rudi Rahn, Jim Talbert

Preprints 2019  

 QFET-2019-13 Non-leptonic B-decays at two loops in QCD factorisation
 Author:   G. Bell, M. Beneke, T. Huber, X.-Q. Li
 QFET-2019-12 Two-loop non-leptonic penguin amplitude in QCD factorization
 Author:   G. Bell, M. Beneke, T. Huber, X.-Q. Li
 QFET-2019-11 The New Physics Reach of Null Tests with D → π l l D to pill and Ds → K l l Ds to Kll Decays
 Author:   Rigo Bause, Marcel Golz, Gudrun Hiller, Andrey Tayduganov
 https://arxiv.org/abs/1909.11108
QFET-2019-10Effective Theory Approach to New Physics with Flavour: General Framework and a Leptoquark Example
 Author:   Marzia Bordone, Oscar Cata, 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 bottom-up perspective, as long as the NP scale is sufficiently large compared to the energies probed in the experimental observables. However, when taking into account the different quark and lepton flavours, the number of free parameters increases dramatically, which makes generic studies of the NP flavour structure infeasible. In this paper, we address this issue in view of the recently observed "flavour anomalies" in B-meson decays, which we take as a motivation to develop a general framework that allows us to systematically reduce the number of flavour parameters in the EFT. This framework can be easily used in global fits to flavour observables at Belle II and LHCb as well as in analyses of flavour-dependent collider signatures at the LHC. Our formalism represents an extension of the well-known minimal-flavour-violation approach, and uses Froggatt-Nielsen charges to define the flavour power-counting. As a relevant illustration of the formalism, we apply it to the flavour structures which could be induced by a U1 vector leptoquark, which represents one of the possible explanations for the recent hints of flavour non-universality in semileptonic B-decays. We study the phenomenological viability of this specific framework performing a fit to low-energy flavour observables.

 
 arxiv.org/abs/1910.02641
 QFET-2019-09 Explaining (g-2)e and (g-2)μ together naturally
 Author:   Gudrun Hiller, Clara Hormigos-Feliu, Daniel F. Litim, Tom Steudtner
 QFET-2019-08 Light-Cone Sum Rules for B→ Kπ Form Factors and Applications to Rare Decays
 Author:   Sebastien Descotes-Genon, Alexander Khodjamirian and Javier Virto
 Comments: JHEP 1912, 083 (2019)
 arxiv.org/abs/1908.02267
 QFET-2019-07 Long distance effects in inclusive rare B decays and phenomenology of B→ Xd l+l-
 Author:   Tobias Hurth, Enrico Lunghi, Jack Jenkins, Qin Qin, K. Keri Vos
 QFET-2019-06 Lepton Flavor Universality tests through angular observables of B → D(*) l ν decay modes
 Author:   D. Becirevic, M. Fedele, I. Nisandzic, A. Tayduganov
 QFET-2019-05 ASYMPTOTICALLY SAFE EXTENSIONS OF THE STANDARD MODEL WITH FLAVOR PHENOMENOLOGY
 Author:   Gudrun Hiller, Clara Hormigos, Daniel Litim and Tom Steudtner
 QFET-2019-04 chiral effective theories with a light scalar at one loop
 Author:   Oscar Cata and Christoph Mueller
 QFET-2019-03 Linking Lepton Number Violation to B Anomalies
 Author:   Oscar Cata and Thomas Mannel
 QFET-2019-02 Heavy neutrino searches at future Z-factories
 Author:   Jian-Nan Ding, Qin Qin and Fu-Sheng Yu
 QFET-2019-01 Progress and Challenges in the study of direct CP violation and γ determinations: CKM 2018 working group V summary
 Author:   S. Perazzini , M. Sevoir and K.K. Vos

Preprints 2018  

 QFET-2018-25 Muon-electron scattering at NNLO: the hadronic corrections
 Author:   Matteo Fael, Massimo Passera
 QFET-2018-24 Generic dijet soft functions at two-loop order: correlated emissions
 Author:   Guido Bell, Rudi Rahn and Jim Talbert
 QFET-2018-23 Inclusive weak decays of heavy hadrons: strong corrections to the ρD/mQ3 term at NLO
 Author:   Thomas Mannel and Alexei A. Pivovarov
 QFET-2018-22 Vcb determination from inclusive b → c decays: an alternative method
 Author:   Matteo Fael, Thomas Mannel and K. Keri Vos
 QFET-2018-21 Testing the standard model with D(s)→ K1 (→ Kππ) γ decays
 Author:   N.Adolph, G.Hiller and A.Tayduganov
 QFET-2018-20 NLO prediction for the decays τ → ll'l'νν and μ → eeeνν
 Author:   Matteo Fael
 QFET-2018-19 Z→π+π-, K+K-: a touchstone of the PQCD approach
 Author:   Shan Cheng and Qin Qin
 QFET-2018-18 The phenomenology of electric dipole moments in models of scalar leptoquarks
 Author:   W. Dekens, J. de Vries, M. Jung, and K.K. Vos
 QFET-2018-17 Hadronic corrections to μ-e scattering at NNLO with space-like data
 Author:   Matteo Fael
 QFET-2018-16 Automated Calculation of N-jet Soft Functions
 Author:   Guido Bell, Bahman Dehnadi, Tobias Mohrmann and Rudi Rahn
 QFET-2018-15 Theory of CP violation in B decays
 Author:   K. Keri Vos
 QFET-2018-14 Revisiting B → ππ l ν at large dipion masses
 Author:   Thorsten Feldmann, Danny van Dyk and K. Keri Vos
 QFET-2018-13 Five-particle contributions to the inclusive rare B → Xs(d)   l+l- decays
 Author:   Tobias Huber, Qin Qin and K. Keri Vos
 QFET-2018-12 Discovery potential of stable and near-threshold doubly heavy tetraquarks at the LHC
 Author:   Ahmed Ali, Qin Qin, Wei Wang
 QFET-2018-11 Exploring B→ππ, π K Decays at the High-Precision Frontier
 Author:   Robert Fleischer, Ruben Jaarsma, Eleftheria Malami and K. Keri Vos
 QFET-2018-10 Two-loop anomalous dimensions of generic dijet soft functions
 Author:   Guido Bell, Rudi Rahn and Jim Talbert
 QFET-2018-09 Null tests from angular distributions in D → P1 P2 l+ l-, l=e,μ decays on and off peak
 Author:   Stefan de Boer, Gudrun Hiller
 QFET-2018-08 Prospects of discovering stable double-heavy tetraquarks at a Tera-Z factory
 Author:   Ahmed Ali, Alexander Ya. Parkhomenko, Qin Qin, Wei Wang
 Comments: arXiv:1805.02535
 reader.elsevier.com/reader/sd/2BD564A75DE494431363CC98105D792EC328ABDD595331948C75D78304E9B9EC4C35CCCEB0B8375DC650B79AD6B61A94
 QFET-2018-07 B0-B0 mixing: matching to HQET at NNLO
 Author:   Andrey G. Grozin, Thomas Mannel and Alexei A. Pivovarov
 QFET-2018-06 On the decays B → K(*)+leptonium
 Author:   Matteo Fael and Thomas Mannel
 arxiv.org/abs/arXiv:1803.08880
 QFET-2018-05 Crawling technicolor
 Author:   Oscar Cata, Rod Crewther and Lewis Tunstall
 QFET-2018-04 The photon polarization in radiative D decays, phenomenologically
 Author:   Stefan de Boer, Gudrun Hiller
 QFET-2018-03 Automated Calculation of Dijet Soft Functions in the Presence of Jet Clustering Effects
 Author:   Guido Bell, Rudi Rahn and Jim Talbert
 QFET-2018-02 Closing in on the radiative weak chiral couplings
 Author:   L. Cappiello, O. Cata and G. D'Ambrosio
 QFET-2018-01 Reparameterization Invariance and Partial Resummations of the Heavy Quark Expansion
 Author:   Thomas Mannel and Keri K. Vos

Preprints 2017  

 QFET-2017-23 Towards New Frontiers with B→π K Decays
 Author:   R. Fleischer, R. Jaarsma, K.K.Vos
 QFET-2017-22 Charged lepton flavor violating Higgs decays at the CEPC
 Author:   Qin Qin, Qiang Li, Cai-Dian Lu, Fu-Sheng Yu, Si-Hong Zhou
 Comments: arXiv:1711.07243
 QFET-2017-21 Testing Lepton Universality in Semileptonic Λb → Λc* Decays
 Author:   Philipp Böer, Marzia Bordone, Elena Graverini, Gino Isidori, Patrick Owen, Nicola Serra, Danny van Dyk and Marcello Rotondo
 QFET-2017-20 Complete One-Loop Renormalization of the Higgs-Electroweak Chiral Lagrangian
 Author:   Gerhard Buchalla, Oscar Cata, Alejandro Celis, Marc Knecht and Claudius Krause
 QFET-2017-19 Charged Lepton flavour violation in a Pati-Salam[2mm] model with gauged flavour symmetry
 Author:   Paul Moch
 QFET-2017-18 Lepton flavour violation in a Pati-Salam model with gauged flavour symmetry
 Author:   Paul Moch
 QFET-2017-17 Rare radiative charm decays in the standard model and beyond
 Author:   Stefan de Boer
 QFET-2017-16 Towards an asymptotically safe completion of the Standard Model
 Author:   Andrew Bond, Gudrun Hiller, Kamila Kowalska, Daniel Litim
 QFET-2017-15 Sharp spectral features from light dark matter decay via gravity portals
 Author:   Oscar Catà, Alejandro Ibarra and Sebastian Ingenhütt
 QFET-2017-14 Two loop virtual corrections to b→(d,s)l+l- and c→ ul+l- for arbitrary momentum transfer
 Author:   Stefan de Boer
 QFET-2017-13 CP Violation in Multibody B Decays from QCD Factorization
 Author:   Rebecca Klein, Thomas Mannel, Javier Virto, K. Keri Vos
 QFET-2017-12 Probing pion distribution amplitude with data on the timelike pion form factor
 Author:   Shan Cheng, Alexander Khodjamirian and Aleksey V. Rusov
 QFET-2017-11 Expectations for the muon g-2 in simplified models with dark matter
 Author:   Kamila Kowalska, Enrico Maria Sessolo
 arxiv.org/abs/1707.00753
 QFET-2017-10 B0- B0 mixing: towards NNLO matching analysis
 Author:   Andrey G. Grozin, Thomas Mannel, Alexei A. Pivovarov
 QFET-2017-09 Direct CP asymmetry in D→ π-π+ and D→ K-K+ from QCD Light-Cone Sum Rules
 Author:   Alexander Khodjamirian and Alexey A. Petrov
 Comments: Published in Phys.Lett. B718 (2013) 1014-1019
 arxiv.org/abs/1706.07780
 QFET-2017-08 D0-D0  mixing parameter y in the factorization-assisted topological-amplitude approach
 Author:   Hua-Yu Jiang, Fu-Sheng Yu, Qin Qin, Hsiang-nan Li, Cai-Dian Lu
 Abstract  -  arxiv.org/pdf/1705.07335.pdf
 QFET-2017-07 Spontaneous CP violation in multi-Higgs potentials with triplets of (3n2) and (6n2)
 Author:   Ivo de Medeiros Varzielas, Stephen F. King, Christoph Luhn, Thomas Neder
 QFET-2017-06 Higher-Twist Effects in Light-Cone Sum Rule for the B → π Form Factor
 Author:   Aleksey V. Rusov
 Comments: Published in Eur.Phys.J. C77 (2017) no.7, 442
 arxiv.org/abs/1705.01929
 QFET-2017-05 Minima of multi-Higgs potentials with triplets of (3n2) and (6 n2)
 Author:   Ivo de Medeiros Varzielas, Stephen F. King, Christoph Luhn, Thomas Neder
 arxiv.org/abs/1704.06322
 QFET-2017-04 Directions for model building from asymptotic safety
 Author:   Andrew Bond, Gudrun Hiller, Kamila Kowalska, Daniel Litim
 QFET-2017-03 Bs→ K lνl and B(s) → π (K) l+l- at large recoil and CKM matrix elements
 Author:   Alexander Khodjamirian and Aleksey V. Rusov
 Comments: Published in JHEP 1708 (2017) 112
 arxiv.org/abs/1703.04765
 QFET-2017-02 Timelike-helicity B→ππ form factors from light-cone sum rules with dipion distribution amplitudes
 Author:   Shan Cheng, Alexander Khodjamirian, and Javier Virto
 Comments: published in Phys. Rev. D 96 (2017) no.5, 051901
 arxiv.org/abs/1709.00173
 QFET-2017-01 Inclusive Semitauonic B Decays to Order Λ QCD3/mb3
 Author:   Thomas Mannel, Aleksey V. Rusov, Farnoush Shahriaran
 Comments: Published in Nucl.Phys. B921 (2017) 211-224
 arxiv.org/abs/1702.01089

Preprints 2016  

 QFET-2016-19 Towards New Frontiers in the Exploration of Charmless Non-Leptonic B Decays
 Author:   Robert Fleischer, Ruben Jaarsma, K. Keri Vos
 arxiv.org/abs/1612.07342
 QFET-2016-18 Rare radiative charm decays within the Standard Model and beyond
 Author:   Stefan de Boer and Gudrun Hiller
 QFET-2016-17 MSSM fits to the ATLAS 1 lepton excess
 Author:   Kamila Kowalska, Enrico Maria Sessolo
 arxiv.org/abs/1611.01852
 QFET-2016-16 Lepton flavour violation in a Pati-Salam model with gauged flavour symmetry
 Author:   Thorsten Feldmann, Christoph Luhn, Paul Moch
 Abstract  -  arxiv.org/abs/1608.04124
 QFET-2016-15 Phenomenological MSSM in the light of new 13 TeV LHC data
 Author:   Kamila Kowalska
 arxiv.org/abs/1608.02489
 QFET-2016-14 Revisiting Uraltsev's BPS limit for Heavy Quarks
 Author:   Johannes Heinonen and Thomas Mannel
 QFET-2016-13 New Strategy to Explore CP Violation with Bs-→ K- K+
 Author:   R. Fleischer, R. Jaarsma, and K.K. Vos
 QFET-2016-12 Littlest Seesaw model from S4 x U(1)
 Author:   Stephen F. King, Christoph Luhn
 arxiv.org/abs/1607.05276
 QFET-2016-11 B0s-B0s Oscillations as a New Tool to Explore CP Violation in Ds± Decays
 Author:   R. Fleischer and K.K. Vos
 Abstract  -  arxiv.org/abs/1606.06042
 QFET-2016-10 B0-B0 Mixing at Next-to-Leading Order
 Author:   A.G.Grozin, R.Klein, Th.Mannel,A.A.Pivovarov
 QFET-2016-09 Assessing lepton-flavour non-universality from B→ K*ll angular analyses
 Author:   Bernat Capdevila, Sebastien Descotes-Genon, Joaquim Matias, Javier Virto
 QFET-2016-08 Opportunities with (semi)leptonic rare charm decays
 Author:   Stefan de Boer
 QFET-2016-07 Near-threshold production of heavy quarks with QQbarthreshold
 Author:   M. Beneke, Y. Kiyo, A. Maier, J. Piclum
 arxiv.org/abs/1605.03010
 QFET-2016-06 Two-body non-leptonic heavy-to-heavy decays at NNLO in QCD factorization
 Author:   T. Huber, S. Kränkl, X.-Q. Li
 QFET-2016-05 Non-abelian gauge extensions for B-decay anomalies
 Author:   Sofiane Boucenna, Alejandro Celis, Javier Fuentes-Martin, Avelino Vicente, Javier Virto
 arxiv.org/pdf/1604.03088.pdf
 QFET-2016-04 B→ππ form factors from light-cone sum rules with B-Meson distribution amplitudes
 Author:   Shan Cheng, Alexander Khodjamirian, Javier Virto
 Comments: Published in JHEP05(2017)157
 [PDF]  -  arxiv.org/abs/1701.01633
 QFET-2016-03 CP-odd invariants for multi-Higgs models: applications with discrete symmetry
 Author:   Ivo de Medeiros Varzielas, Stephen F. King, Christoph Luhn, Thomas Neder
 arxiv.org/abs/1603.06942
 QFET-2016-02 QCD Factorization Theorem for B → ππlν" Decays at Large Dipion Masses
 Author:   Philipp Böer, Thorsten Feldmann and Danny van Dyk
 Abstract  -  arxiv.org/abs/1608.07127
 QFET-2016-01 NNNLO determination of the bottom-quark mass from non-relativistic sum rules
 Author:   Martin Beneke, Andreas Maier, Jan Piclum, Thomas Rauh

 


If you encounter any problems or have any questions or suggestions, please contact