Publications (43)
Spectator interactions in B -> V gamma decays and QCD factorisation
S. Descotes-Genon, C. T. Sachrajda
We study the radiative decays B -> V gamma (where V=rho, K^*) in the framework of QCD factorisation, and in particular the hard-spectator contributions to the decay amplitudes. For…
The Determination of alpha_s from Tau Decays Revisited
M. Davier, S. Descotes-Genon, A. Hocker +2
We revisit the determination of alpha_s(m_tau) using a fit to inclusive tau hadronic spectral moments in light of (1) the recent calculation of the fourth-order perturbative coeffi…
pi-pi and pi-K scatterings in three-flavour resummed chiral perturbation theory
S. Descotes-Genon
The (light but not-so-light) strange quark may play a special role in the low-energy dynamics of QCD. The presence of strange quark pairs in the sea may have a significant impact o…
Implications of LHCb measurements and future prospects
LHCb collaboration, A. Bharucha, I. I. Bigi +763
During 2011 the LHCb experiment at CERN collected 1.0 fb-1 of sqrt{s} = 7 TeV pp collisions. Due to the large heavy quark production cross-sections, these data provide unprecedente…
Low-energy pi-pi and pi-K scatterings revisited in three-flavour resummed chiral perturbation theory
S. Descotes-Genon
Chiral symmetry breaking may exhibit significantly different patterns in two chiral limits: N_f=2 massless flavours (m_u=m_d=0, m_s physical) and N_f=3 massless flavours (m_u=m_d=0…
B, D and K decays
G. Buchalla, T. K. Komatsubara, F. Muheim +124
With the advent of the LHC, we will be able to probe New Physics (NP) up to energy scales almost one order of magnitude larger than it has been possible with present accelerator fa…
Chiral dynamics with strange quarks in the light of recent lattice simulations
V. Bernard, S. Descotes-Genon, G. Toucas
Several lattice collaborations performing simulations with 2+1 light dynamical quarks have experienced difficulties in fitting their data with standard Nf=3 chiral expansions at ne…
Opportunities in Flavour Physics at the HL-LHC and HE-LHC
A. Cerri, V. V. Gligorov, S. Malvezzi +300
Motivated by the success of the flavour physics programme carried out over the last decade at the Large Hadron Collider (LHC), we characterize in detail the physics potential of it…
Analyticity of isospin-violating form factors and the second-class decay
S. Descotes-Genon, B. Moussallam
We consider the evaluation of the isospin-violating vector and scalar form factors relying on a systematic application of analyticity and unitarity, combined with chiral exp…
QCD factorisation and flavour symmetries illustrated in B_d,s -> KK decays
S. Descotes-Genon
We present a new analysis of B_d,s -> KK modes within the SM, relating them in a controlled way through SU(3)-flavour symmetry and QCD-improved factorisation. We propose a set of s…
Dispersive evaluation of the second-class amplitude in the standard model
S. Descotes-Genon, E. Kou, B. Moussallam
We reevaluate the two form factors relevant for the second-class decay mode, making systematic use of analyticity, unitarity, combined with updated inputs to the NLO ch…
Current status of the Standard Model CKM fit and constraints on New Physics
J. Charles, O. Deschamps, S. Descotes-Genon +12
This letter summarises the status of the global fit of the CKM parameters within the Standard Model performed by the CKMfitter group. Special attention is paid to the inputs for th…
Physics at BES-III
D. M. Asner, T. Barnes, J. M. Bian +82
This physics book provides detailed discussions on important topics in -charm physics that will be explored during the next few years at \bes3 . Both theoretical and experiment…
A new analysis of scattering from Roy and Steiner type equations
P. Büttiker, S. Descotes-Genon, B. Moussallam
With the aim of generating new constraints on the OZI suppressed couplings of chiral perturbation theory a set of six equations of the Roy and Steiner type for the - and -wav…
pi K scattering inputs to ChPT
S. Descotes-Genon, P. Buttiker, B. Moussallam
Experimental information on low energy scattering would shed light on the poorly known OZI suppressed sector of ChPT. I describe recent work aimed at generating such informat…
Renormalization of B-meson distribution amplitudes
S. Descotes-Genon, N. Offen
We summarize a recent calculation of the evolution kernels of the two-particle B-meson distribution amplitudes and taking into account three-particle contributions. I…
The role of strange sea quarks in chiral extrapolations on the lattice
S. Descotes-Genon
Since the strange quark has a light mass of order Lambda_QCD, fluctuations of sea s-s bar pairs may play a special role in the low-energy dynamics of QCD by inducing significantly…
Anatomy of New Physics in B-Bbar mixing
A. Lenz, U. Nierste, J. Charles +7
We analyse three different New Physics scenarios for Delta F=2 flavour-changing neutral currents in the quark sector in the light of recent data on neutral-meson mixing. We paramet…
A note on renormalon models for the determination of alpha_s(M_tau)
S. Descotes-Genon, B. Malaescu
The tau hadronic width provides a determination of the strong coupling constant alpha_s at low energies, since it can be related to a weighted integral of the Adler function in the…
Factorization, the light-cone distribution amplitude of the B-meson and the radiative decay B -> gamma l nu_l
S. Descotes-Genon, C. T. Sachrajda
We study the radiative decay B -> gamma l nu_l in the framework of QCD factorization. We demonstrate explicitly that, in the heavy-quark limit and at one-loop order in perturbation…
The K^*_0(800) scalar resonance from Roy-Steiner representations of pi K scattering
S. Descotes-Genon, B. Moussallam
We discuss the existence of the light scalar meson K^*_0(800) (also called kappa) in a rigorous way, by showing the presence of a pole in the pi K --> pi K amplitude on the second…
Determining the chiral condensate from the distribution of the winding number beyond topological susceptibility
V. Bernard, S. Descotes-Genon, G. Toucas
The first two non-trivial moments of the distribution of the topological charge (or gluonic winding number), i.e., the topological susceptibility and the fourth cumulant, can be co…
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.
Resumming QCD vacuum fluctuations in three-flavour Chiral Perturbation Theory
S. Descotes-Genon, N. H. Fuchs, L. Girlanda +1
Due to its light mass of order Lambda_QCD, the strange quark can play a special role in Chiral Symmetry Breaking (ChSB): differences in the pattern of ChSB in the limits N_f=2 (m_u…
Isospin analysis of charmless B-meson decays
J. Charles, O. Deschamps, S. Descotes-Genon +1
We discuss the determination of the CKM angle using the non-leptonic two-body decays , and using the latest data available. We illustrate th…
Two-loop representations of low-energy pion form factors and pi-pi scattering phases in the presence of isospin breaking
S. Descotes-Genon, M. Knecht
Dispersive representations of the pi-pi scattering amplitudes and pion form factors, valid at two-loop accuracy in the low-energy expansion, are constructed in the presence of isos…
PSI/UZH Workshop: Impact of on New Physics Searches
A. Crivellin, M. Ghezzi, D. Müller +18
In these mini-proceedings we review the results of the workshop `Impact of on New Physics Searches' that took place at the Paul Scherrer Institute (PSI) on the 18th-…
Exploring New Physics in C_7-C_7'
S. Descotes-Genon, D. Ghosh, J. Matias +1
We discuss the model dependence in the determination of the Wilson coefficient C_7 that governs the radiative electromagnetic decays of B mesons in the Standard Model, by consideri…
Predictions of selected flavour observables within the Standard Model
J. Charles, O. Deschamps, S. Descotes-Genon +10
This letter gathers a selection of Standard Model predictions issued from the metrology of the CKM parameters performed by the CKMfitter group. The selection includes purely lepton…
How far can you go ? Surprises and pitfalls in three-flavour chiral extrapolations
S. Descotes-Genon
The presence of strange sea quark pairs may have a significant impact of the pattern of chiral symmetry breaking : in particular large differences can occur between the chiral limi…
Future Physics Programme of BESIII
M. Ablikim, M. N. Achasov, P. Adlarson +482
There has recently been a dramatic renewal of interest in the subjects of hadron spectroscopy and charm physics. This renaissance has been driven in part by the discovery of a plet…
The Two Higgs Doublet of Type II facing flavour physics data
O. Deschamps, S. Descotes-Genon, S. Monteil +3
We discuss tests of the charged Higgs sector of the Two Higgs Doublet Model (2HDM) of Type II in the light of recent flavour physics data. Particular attention is paid to recent me…
Universality of nonperturbative QCD effects in radiative B-decays
S. Descotes-Genon, C. T. Sachrajda
We demonstrate, by an explicit one-loop calculation, that at leading twist the nonperturbative effects in B -> gamma l nu, B -> gamma gamma and B -> gamma l+ l- radiative decays ar…
Workshop on Precision Measurements of alphas
S. Bethke, A. H. Hoang, S. Kluth +32
These are the proceedings of the "Workshop on Precision Measurements of alphas" held at the Max-Planck-Institute for Physics, Munich, February 9-11, 2011. The workshop explored in…
Extracting CP violation and strong phase in D decays by using quantum correlations in psi(3770)-> D0\bar{D}0 -> (V1V2)(V3V4) and psi(3770)->D0\bar{D}0 -> (V1V2)(K pi)
J. Charles, S. Descotes-Genon, X. -W. Kang +2
The charm quark offers interesting opportunities to cross-check the mechanism of CP violation precisely tested in the strange and beauty sectors. In this paper, we exploit the angu…
Anatomy of a new anomaly in non-leptonic B decays
M. Algueró, A. Crivellin, S. Descotes-Genon +2
We discuss the anatomy of the observable designed as a ratio of the longitudinal components of versus decays. We focus on the particular case of…
Three-particle contributions to the renormalisation of B-meson light-cone distribution amplitudes
S. Descotes-Genon, N. Offen
We study light-cone distribution amplitudes of heavy-light systems, such as a B-meson. By an explicit computation, we determine how two-parton distribution amplitudes mix with thre…
Disentangling weak and strong interactions in Dalitz-plot analyses
J. Charles, S. Descotes-Genon, J. Ocariz +1
Dalitz-plot analyses of decays provide direct access to decay amplitudes, and thereby weak and strong phases can be disentangled by resolving the interference…
New Physics in B-Bbar mixing in the light of recent LHCb data
A. Lenz, U. Nierste, J. Charles +5
We perform model-independent statistical analyses of three scenarios accommodating New Physics (NP) in Delta F=2 flavour-changing neutral current amplitudes. In a scenario in which…
Chiral order and fluctuations in multi-flavour QCD
S. Descotes-Genon, L. Girlanda, J. Stern
Multi-flavour (N_f>=3) Chiral Perturbation Theory (ChPT) may exhibit instabilities due to vacuum fluctuations of sea q-bar q pairs. Keeping the fluctuations small would require a v…
New physics in meson mixing: future sensitivity and limitations
J. Charles, S. Descotes-Genon, Z. Ligeti +4
The mixing of neutral mesons is sensitive to some of the highest scales probed in laboratory experiments. In light of the planned LHCb Upgrade II, a possible upgrade of Belle II, a…
Isospin breaking in the phases of the Ke4 form factors
V. Bernard, S. Descotes-Genon, M. Knecht
Isospin breaking in the Kl4 form factors induced by the difference between charged and neutral pion masses is studied. Starting from suitably subtracted dispersion representations,…
Connecting B_d and B_s decays through QCD factorisation and flavour symmetries
S. Descotes-Genon
We analyse B_{d,s} -> K(*)0 K(*)0 modes within the SM, relating them in a controlled way through SU(3)-flavour symmetry and QCD-improved factorisation. We propose a set of sum rule…