Publications (70)
Elimination of Ambiguities in pi-pi Amplitudes Using Roy's Equations
R. Kaminski, L. Lesniak, B. Loiseau
Roy's equations are used to check if scalar-isoscalar pi-pi amplitudes fitted to the ``up-flat'' and ``down-flat'' phase shift solutions fulfill crossing symmetry below 1 GeV. It i…
Interference between f0(980) and rho(770) resonances in B --> pion-pion-kaon decays
B. El-Bennich, A. Furman, R. Kaminski +2
We study the contribution of the strong interaction between the two pions in S- and P-waves to the weak B --> pion pion kaon decay amplitudes. The interference between these two wa…
pi-pi Scattering and the Meson Resonance Spectrum
W. M. Kloet, B. Loiseau
A pi-pi, Kbar-K, and rho-rho(omega-omega) fully coupled channel model is used to predict the lowest isospin S, P, D, F-wave phase shifts and inelasticities for elastic pi-pi scatte…
The antinucleon-nucleon quasi-bound states: J/psi and atomic evidence
S. Wycech, B. Loiseau
The measurements of J/psi decays into photon, proton and antiproton show a strong enhancement at the proton-antiproton threshold not seen in the decays into neutral pion, proton an…
Determination of the pion-nucleon coupling constant and scattering lengths
T. E. O. Ericson, B. Loiseau, A. W. Thomas
We critically evaluate the isovector GMO sum rule for forward pion-nucleon scattering using the recent precision measurements of negatively charged pion-proton and pion-deuteron sc…
Precision determination of the pi-N scattering lengths and the charged pi-NN coupling constant
T. E. O. Ericson, B. Loiseau, A. W. Thomas
We critically evaluate the isovector GMO sumrule for the charged coupling constant using recent precision data from p and d atoms and with careful attention to…
EA-ERT: a new ensemble approach to convert time-lapse ERT data to soil water content
B. Loiseau, S. D. Carrière, N. K. Martin-StPaul +8
Electrical Resistivity Tomography (ERT) is increasingly used to study subsurface hydrological processes. It shows promising potential for estimating soil water content, a key but c…
Final state interactions in B --> pi pi K and B--> K antiK K decays
L. Lesniak, A. Furman, R. Kaminski +2
Analysis of charged and neutral B meson decays into pi+ pi- K, K+ K- K and K0S K0S K0S is performed using a unitary representation of the pi pi and K anti- K final state interactio…
The Scalar Meson f0(980) in Heavy-Meson Decays
B. El-Bennich, O. Leitner, J. -P. Dedonder +1
A phenomenological analysis of the scalar meson f0(980) is performed that relies on the quasi-two body decays D and Ds -> f0(980)P, with P=pi, K. The two-body branching ratios are…
Pion-Lambda-Sigma Coupling Extracted from Hyperonic Atoms
B. Loiseau, S. Wycech
The latest measurements of the atomic level width in Sigma-hyperonic Pb atom offer the most accurate datum in the region of low-energy Sigma-hyperon physics. Atomic widths are due…
Multichannel Interaction Analysis of Scalar Mesons Below 1800 MeV
R. KamiÅski, L. LeÅniak, B. Loiseau
Properties of scalar--isoscalar mesons in a mass range from pi-pi threshold up to 1800 MeV are analysed using an unitary model with separable interactions in three decay channels:…
A phenomenological determination of the pion-nucleon scattering lengths from pionic hydrogen
T. E. O. Ericson, B. Loiseau, S. Wycech
A model independent expression for the electromagnetic corrections to a phenomenological hadronic pion-nucleon scattering length, extracted from pionic hydrogen, is obtained. In a…
Application of Roy's equations to analysis of pion-pion experimental data
B. Loiseau, R. Kaminski, L. Lesniak
The scalar-isoscalar, scalar-isotensor and vector-isovector pion-pion partial wave amplitudes are analyzed. Preliminary results indicate that only the scalar-isoscalar amplitude fi…
Final state strong interaction constraints on weak D0 -> K0S pi+ pi- decay amplitudes
B. Loiseau, J. -P. Dedonder, A. Furman +2
Weak decay tree and annihilation - t-channel W - exchange amplitudes for the D0 -> K0S pi+ pi- process are calculated using quasi two-body QCD factorization approach and unitarity…
The physical interest in kaonic- and antiprotonic-deuterium atoms
S. Wycech, B. Loiseau
Exotic deuterium and helium are discussed. The S, P and D levels of antiprotonic and kaonic atoms are calculated. Absorptive, subthreshold antiproton-nucleon amplitudes are extract…
Scalar resonances in a unitary -wave model for
D. R. Boito, J. -P. Dedonder, B. El-Bennich +2
We propose a model for decays following experimental results which indicate that the two-pion interaction in the -wave is dominated by the scalar resona…
Long-distance effects and final state interactions in B to pion pion K and B to K anti-K K decays
A. Furman, R. Kaminski, L. Lesniak +1
B decays into pion pion K and K anti-K K, where the pion-pion and anti-K K pairs interact in isospin zero S-wave, are studied in the pion-pion effective mass range from threshold t…
A phenomenological negatively charged pion-proton scattering length from pionic hydrogen
T. E. O. Ericson, B. Loiseau, S. Wycech
We derive a closed, model independent, expression for the electromagnetic correction factor to a phenomenological hadronic scattering length extracted from a hydrogenic atom. It is…
The Pion-Nucleon coupling constant from np charge exchange scattering
B. Loiseau, T. E. O. Ericson, J. Rahm +2
A novel extrapolation method has been used to deduce the charged Pion-Nucleon coupling constant from backward differential scattering cross sections. We applied it to new meas…
Peculiarities in multichannel interaction amplitudes for meson-meson scattering and scalar meson spectroscopy
R. Kaminski, L. Lesniak, B. Loiseau
Interactions in coupled channels pipi, KKbar and an effective 2pi2pi in scalar-isoscalar wave have been analysed. Influence of interchannel couplings on analytical structure of mul…
Scalar meson properties from D-meson decays
B. El-Bennich, O. M. A. Leitner, B. Loiseau +1
Decay amplitudes of D(D_s)->f0(980)X, X=pi, K, are compared to experimental branching ratios with the aim of singling out the poorly known D->f0(980) transition form factor in thes…
Photon or meson formation in decays into
J. -P. Dedonder, B. Loiseau, S. Wycech
The measurements of the decays by the BES Collaboration indicate an enhancement at the threshold which, however, is not present…
Antinucleon-nucleus interaction near threshold from the Paris potential
E. Friedman, A. Gal, B. Loiseau +1
A general algorithm for handling the energy dependence of hadron-nucleon amplitudes in the nuclear medium, consistently with their density dependence, has been recently applied to…
Scalar Mesons and Multichannel Amplitudes
R. Kaminski, L. Lesniak, B. Loiseau
Properties of scalar-isoscalar mesons are analysed using separable interactions in three decay channels: pion-pion, kaon-antikaon and an effective 2pion-2pion. We obtain different…
Dalitz plot studies of D0 --> K0S pi+ pi- decays in a factorization approach
J. -P. Dedonder, R. Kaminski, L. Lesniak +1
The presently available high-statistics data of the D0 --> K0S pi+ pi- processes measured by the Belle and BABAR Collaborations are analyzed within a quasi two-body QCD factorizati…
Mesonic interactions and their contribution to strong phases in flavor physics
B. El-Bennich, A. Furman, R. Kaminski +3
We analyze the contributions of hadronic final-state interactions to the strong phases generated in the B -> Kpipi weak decays. To this end, we develop an alternative approach to t…
K* resonance effects on direct CP violation in B -> pi pi K
O. Leitner, J. -P. Dedonder, B. Loiseau +1
Charged and neutral B decays into two charged pions and a charged or a neutral kaon are analyzed within the QCD factorization scheme where final state interactions before and after…
Scalar resonance effects on the B_s - \bar B_s mixing angle
O. Leitner, J. -P. Dedonder, B. Loiseau +1
The and decays are analyzed within generalized QCD factorization including all leading-order corrections in $\alphas$. We point out that…
Modeling electromagnetic form factors of light and heavy pseudoscalar mesons
B. El-Bennich, J. P. B. C. de Melo, B. Loiseau +2
The electromagnetic form factors of light and heavy pseudoscalar mesons are calculated within two covariant constituent-quark models, a light-front and a dispersion relation approa…
Annihilation range and final-state interaction in the antiproton-proton annihilation into pi-pi+
Bruno El-Bennich, W. M Kloet, B. Loiseau
The large set of accurate data on differential cross section and analyzing power from the CERN LEAR experiment on in the range from 360 to 1550 MeV/c is well…
CP violation and kaon-pion interactions in B --> K pi+ pi- decays
B. El-Bennich, A. Furman, R. Kaminski +3
We study CP violation and the contribution of the strong kaon-pion interactions in the three body B --> K pi+ pi- decays. We extend our recent work on the effect of the two-pion S-…
Extraction of baryonia from the lightest anti-protonic atoms
B. Loiseau, S. Wycech
Anti-protonic hydrogen and helium atoms are analyzed. Level shifts and width are expressed in terms of -nucleon sub-threshold scattering lengths and volumes. Experimental…
Paris nucleon-antinucleon potential constrained by recent antiprotonic-atom data and antineutron-proton total cross sections
B. El-Bennich, M. Lacombe, B. Loiseau +1
We report on an updated Paris nucleon-antinucleon optical potential. The long- and intermediate-range real parts are obtained by G-parity transformation of the Paris nucleon-nucleo…
Analysis of New Results For Scalar-Isoscalar pi-pi Phase Shifts
R. Kaminski, L. Lesniak, B. Loiseau
The scalar -- isoscalar pi-pi phase shifts are analysed using a separable potential model of three coupled channels (pipi, KK and an effective 2pi2pi system). Model parameters are…
Parametrizations of three-body hadronic - and -decay amplitudes in terms of analytic and unitary meson-meson form factors
D. Boito, J. -P. Dedonder, B. El-Bennich +4
We introduce parametrizations of hadronic three-body and weak decay amplitudes that can be readily implemented in experimental analyses and are a sound alternative to the s…
Properties of scalar--isoscalar mesons from multichannel interaction analysis below 1800 MeV
R. Kaminski, L. Lesniak, B. Loiseau
Scalar-isoscalar mesons are studied using an unitary model in three channels: pi-pi, K-anti K and an effective 2pi-2pi. All the solutions, fitted to the pi-pi and K-anti K data, ex…
S-, P- and D-wave final state interactions and CP violation in B+- --> pi+- pi-+ pi+- decays
J. -P. Dedonder, A. Furman, R. Kaminski +2
We study CP violation and the contribution of the strong pion-pion interactions in the three-body B+- --> pi+- pi-+ pi+- decays within a quasi two-body QCD factorization approach.…
How precisely can we determine the pion-nucleon coupling constant from the isovector GMO sum rule?
B. Loiseau, T. E. O. Ericson, A. W. Thomas
The isovector GMO sum rule for zero energy forward pion-nucleon scattering is critically studied to obtain the charged pion-nucleon coupling constant using the precise negatively c…
Amplitude analysis of decays in a quasi-two-body QCD factorization approach
J. -P. Dedonder, R. KamiÅski, L. LeÅniak +2
The decay amplitude is derived within a quasi-two-body QCD factorization framework in terms of kaon form factors and to two-kaon-transition functions…
Pseudoscalar-scalar transition form factors in covariant light front dynamics
O. M. A Leitner, B. El-Bennich, B. Loiseau +1
In an explicitly covariant light-front formalism, we analyze transition form factors between pseudoscalar and scalar mesons. Application is performed in case of the $B \to f_0(980)…
Baryonium, a common ground for atomic and high energy physics
S. Wycech, J. P. Dedonder, B. Loiseau
Indications of the existence of quasi-bound states in the N-Nbar system are presented. Measurements by BES discovered a broad enhancement close to the p-pbar threshold in the S wav…
Resonances and weak interactions in decays
D. R. Boito, B. El-Bennich, B. Loiseau +1
We describe the -wave in decays using a unitary model for the Final State Interactions (FSI). The three body decay is treated as a quasi tw…
B decays into pion-pion-kaon and into kaon-antikaon-kaon: long distance and final-state effects
B. Loiseau, A. Furman, R. Kaminski +1
The interplay of strong and weak decay amplitudes for B -> pion-pion-kaon and B -> kaon-antikaon-kaon, with the pion-pion and kaon-antikaon pairs interacting in isospin-0 S-wave, i…
The reaction antirproton-proton into pi+pi-: relativistic aspects and final-state interaction in the pion wave functions
Bruno El-Bennich, W. M. Kloet, B. Loiseau
We use a distorted wave approximation approach which includes and quark-antiquark annihilation mechanisms to reproduce the data set from LEAR on $\bar p p\to Ï^+Ï…
CP violation and final state interactions in B --> K pi pi decays
L. Lesniak, B. El-Bennich, A. Furman +3
Effects of CP violation and of final state interactions between pairs of pseudoscalar mesons are studied in three-body B+, B-, B0 and antiB0 decays into K pi pi. An alternative app…
Antiproton-Proton Channels in J/psi Decays
B. Loiseau, S. Wycech
The recent measurements by the BES Collaboration of J/psi decays into a photon and a proton-antiproton pair indicate a strong enhancement at the proton-antiproton threshold not obs…
Pion-Kaon interaction effects on CP violation in B -> K pi+ pi- decays
B. Loiseau, B. El-Bennich, A. Furman +3
We apply QCD factorization to the quasi two-body B ->(K pi) pi decays where the (K pi)-pair effective mass is limited to 1.8 GeV. Our strong interaction phases constrained by theor…
Strong and Weak Interactions in B to pi+ pi- K Decays
B. Loiseau, B. El-Bennich, A. Furman +2
To describe the weak three-body B decays into pi+ pi- K, we recently derived amplitudes based on two-body QCD factorization followed by pi+ pi- final state interactions in isoscala…
Parametrizations of three-body hadronic - and -decay amplitudes
B. Loiseau, D. Boito, J. -P. Dedonder +4
A short review of our recent work on amplitude parametrizations of three-body hadronic weak and decays is presented. The final states are here composed of three light meson…
Dalitz plot studies of D0 to K0S pi+ pi- decays
L. Lesniak, R. Kaminski, A. Furman +2
The availaible data on the D0 to K0S pi+ pi- decays are analysed in the framework of the quasi two-body QCD factorization approximation. The annihilation, via W-exchange, amplitude…
Precise strength of th piNN coupling constant
T. E. O. Ericson, B. Loiseau, J. Rahm +3
We report here a preliminary value for the piNN coupling constant deduced from the GMO sumrule for forward piN scattering. As in our previous determination from np backward differe…
CP violation and strong pion-pion interactions in the weak B charged decays into three charged pions
B. Loiseau, J. -P. Dedonder, A. Furman +2
An analysis of charged B decay data in a quasi two-body decay into a charged pion plus a S, P,or D state of two charged pions is performed in the QCD factorization framework. The s…
pi-pi scattering amplitudes constrained by Roy's equations
R. Kaminski, L. Lesniak, B. Loiseau
The scalar-isoscalar, scalar-isotensor and vector-isovector pi-pi amplitudes have been fitted simultaneously to experimental data and to to Roy's equations. Resulting pi-pi phase s…
Electromagnetic corrections to p scattering length from pionic hydrogen
T. E. O. Ericson, B. Loiseau, S. Wycech
We derive a closed, model space independent, expression for the electromagnetic correction factor to the scattering length extracted from a hydrogenic atom with an extende…
How precisely can the difference method determine the pion-nucleon coupling constant?
B. Loiseau, T. E. O. Ericson
The Coulomb-like backward peak of the neutron-proton scattering differential cross section is due to one-pion exchange. Extrapolation to the pion pole of precise data should allow…
Dalitz plot studies of decays in a factorization approach
J. -P. Dedonder, R. KamiÅski, L. LeÅniak +1
The Collaboration data of the process are analyzed within a quasi two-body factorization framework. In earlier studies, assuming tran…
Final state interactions and CP violation in B decays to three pseudoscalars
R. Kaminski, B. El Bennich, A. Furman +3
We study CP violation and final state interactions between pions and kaons in B+, B-, B0 and bar B0 decays into K pi pi. The weak transition amplitudes consist of two terms: the fi…
Roy's equations and the pion-pion experimental data
R. Kaminski, L. Lesniak, B. Loiseau
Roy's equations are used to check if the scalar-isoscalar pion-pion scattering amplitudes fitted to experimental data fulfill crossing symmetry conditions. It is shown that the amp…
Two-Pion Exchange in Proton-Proton Scattering
W. R. Gibbs, B. Loiseau
The contribution of the box and crossed two-pion-exchange diagrams to proton-proton scattering at 90 is calculated in the laboratory momentum range up to 12 GeV/c.…
Systematic effects in the determination of the piNN Coupling from pbar p -> nbar n differential cross section
T. E. O. Ericson, B. Loiseau
We show that the coupling constant extracted model-independently from charge exchange is subject to a systematic correction, and, more importantly, that the strong…
Antiproton-proton resonant like channels in J/Psi decays into photon, proton and antiproton
B. Loiseau, S. Wycech
The BES collaboration has recently observed a strong enhancement close to the proton-antiproton threshold in the J/Psi decays into photon, proton and antiproton. Such a structure c…
Theory overview on amplitude analyses with charm decays
B. Loiseau
This contribution about amplitude analyses in multibody hadronic charm decays deals with some attempts to introduce theoretical constraints. Different effective hadronic formalism…
Form factors in B->f0(980) and D->f0(980) transitions from dispersion relations
B. El-Bennich, O. M. A. Leitner, B. Loiseau +1
Within the dispersion relation approach we give the double spectral representation for space-like and time-like B-> f_0(980) and D-> f_0(980) transition form factors in the full q^…
On the structure of the X(1835) baryonium
J. -P. Dedonder, B. Loiseau, B. El-Bennich +1
The measurement by the BES collaboration of J/psi -> gamma p pbar decays indicates an enhancement at the p-pbar threshold. In another experiment BES finds a peak in the invariant m…
Three channel model of meson-meson scattering and scalar meson spectroscopy
R. Kaminski, L. Lesniak, B. Loiseau
New solutions on the scalar -- isoscalar phase shifts are analysed together with previous results using a separable potential model of three coupled channels ($Ï…
Elimination of ambiguities in pion-pion phase shifts using crossing symmetry
R. Kaminski, L. Lesniak, B. Loiseau
Roy's equations, which incorporate crossing symmetry of the pion-pion scattering amplitudes, are used to resolve the present ambiguity between two solutions for the scalar-isoscala…
Are scalar mesons visible in B+- --> pi+pi-pi+- decays?
L. Lesniak, J. -P. Dedonder, A. Furman +2
Two pion effective mass and helicity angle distributions in the charged B-meson decays into three charged pions are studied. The weak decay amplitudes are calculated in the framewo…
New physics in B_s^0 -> J/ÏÏdecays?
B. El-Bennich, J. P. B. C. de Melo, O. Leitner +2
After a brief review of B_s^0 - \bar B_s^0 oscillations, we discuss the weak decays B_s^0 -> J/ÏÏand B_s^0 -> J/Ïf_0(980) and the ratio R_{f_0/Ï} of their decay rates in the li…
The S-Wave in the 1 to 2 GeV Region from a , and () Coupled Channel Model
W. M. Kloet, B. Loiseau
A simple , , and () fully coupled channel model is proposed to predict the isoscalar S-wave phase shifts and inelasticities for scattering in the…
Towards a unitary Dalitz plot analysis of three-body hadronic B decays
L. Lesniak, B. El-Bennich, A. Furman +3
A unitary model of the final state kaon pion interaction amplitudes in the B --> K pi pi decays is constructed. The weak decay penguin amplitudes, derived in QCD factorization, are…