scholarly journals FINAL STARE INTERACTION ENHANCEMENT EFFECT ON THE NEAR THRESHOLD $p\bar p$ SYSTEM IN $B^\pm\to p\bar p \pi^\pm$ DECAY

2007 ◽  
Vol 22 (29) ◽  
pp. 5401-5411 ◽  
Author(s):  
VINCENZO LAPORTA
Keyword(s):  
Mass Spectrum ◽  
Invariant Mass ◽  
Enhancement Effect ◽  
P System ◽  
B Decays ◽  
Final State ◽  
Final State Interactions ◽  
Low Mass ◽  
Three Body ◽  
Mass Enhancement

We discuss the low-mass enhancement effect in the baryon–antibaryon invariant mass in three-body baryonic B decays using final state interactions in the framework of Regge theory. We show that the rescattering between baryonic pair can reproduce the observed mass spectrum.

scholarly journals EXCLUSIVE BARYONIC B DECAYS CIRCA 2005

2006 ◽  
Vol 21 (21) ◽  
pp. 4209-4232 ◽  
Author(s):  
HAI-YANG CHENG
Keyword(s):  
Invariant Mass ◽  
Rest Frame ◽  
Angular Distributions ◽  
Enhancement Effect ◽  
B Decays ◽  
Final State ◽  
Threshold Enhancement ◽  
Intermediate States ◽  
The Status ◽  
Three Body

The status of exclusive two-body and three-body baryonic B decays is reviewed. The threshold enhancement effect in the dibaryon invariant mass and the angular distributions in the dibaryon rest frame are stressed and explained. Weak radiative baryonic B decays mediated by the electromagnetic penguin process b→sγ are discussed. Puzzles with the correlation observed in [Formula: see text] decay and the unexpectedly large rate observed for [Formula: see text] are examined. The former may indicate that the [Formula: see text] system is produced through some intermediate states, while the latter implies the failure of naive factorization for [Formula: see text] modes and may hint at the importance of final-state rescattering effects.

OBSERVATION OF THE ABC EFFECT IN THE FIRST EXCLUSIVE MEASUREMENTS OF pn → dπ0π0

2007 ◽  
Vol 22 (02n03) ◽  
pp. 617-620 ◽  
Author(s):  
◽  
O. Khakimova ◽  
M. Bashkanov ◽  
T. Skorodko ◽  
C. Bargholtz ◽  
...  
Keyword(s):  
Mass Spectrum ◽  
Invariant Mass ◽  
Bound States ◽  
Fundamental System ◽  
Theoretical Models ◽  
Invariant Mass Spectrum ◽  
High Mass ◽  
Threshold Enhancement ◽  
Low Mass ◽  
Mass Enhancement

The reaction pn → dπ0π0 constitutes the most fundamental system for the study of the ABC effect - a puzzling threshold enhancement in the ππ invariant mass spectrum of the ππ system in double-pionic fusion to nuclear bound states. The first exclusive measurements of this reaction have now been carried out at CELSIUS-WASA. They exhibit a striking low-mass enhancement in the ππ invariant mass spectrum, prove it to be a σ-channel phenomenon and falsify conventional theoretical models, which predict an associated high-mass enhancement not present in the new exclusive data. In the kinematically complete data sample we observe a ΔΔ excitation, where the interaction between the two Δ obviously plays a crucial role for the generation of the ππ low-mass enhancement.

scholarly journals Global CP asymmetries in charmless three-body B decays with final state interactions

2021 ◽  
pp. 136824
Author(s):  
I. Bediaga ◽  
T. Frederico ◽  
P.C. Magalhães ◽  
D. Torres Machado
Keyword(s):  
B Decays ◽  
Final State ◽  
Final State Interactions ◽  
Three Body ◽  
Cp Asymmetries

LOW-MASS ππ ENHANCEMENT IN BARYONIC ππ PRODUCTION: ABC EFFECT REVISED BY EXCLUSIVE MEASUREMENTS

2007 ◽  
Vol 22 (02n03) ◽  
pp. 625-628 ◽  
Author(s):  
◽  
M. Bashkanov ◽  
O. Khakimova ◽  
T. Skorodko ◽  
C. Bargholtz ◽  
...  
Keyword(s):  
Mass Spectrum ◽  
Invariant Mass ◽  
Bound States ◽  
Invariant Mass Spectrum ◽  
High Mass ◽  
Crucial Importance ◽  
Threshold Enhancement ◽  
Model Predictions ◽  
Low Mass ◽  
Mass Enhancement

The ABC effect - a puzzling threshold enhancement in the ππ invariant mass spectrum of double-pionic fusion to nuclear bound states - has been investigated since 40 years by inclusive measurements without providing a conclusive interpretation. First exclusive measurements to this topic have now been carried out at CELSIUS-WASA. They confirm a huge ππ threshold enhancement, prove it to be of scalar-isoscalar nature, i.e., a σ-channel phenomenon and reveal the theoretically predicted high-mass enhancement in inclusive spectra to be of πππ rather than of ππ nature - falsifying thus corresponding model predictions for the ABC effect. From the kinematically complete data samples we infer that the interaction between the two Δ particles created in this process is of crucial importance.

WHAT IS THE NATURE OF THE ABC EFFECT?

2011 ◽  
Vol 26 (03n04) ◽  
pp. 627-629
Author(s):  
◽  
M. BASHKANOV ◽  
H. CLEMENT
Keyword(s):  
Mass Spectrum ◽  
Total Cross Section ◽  
Invariant Mass ◽  
Cross Section ◽  
Pion Production ◽  
Invariant Mass Spectrum ◽  
Fusion Reactions ◽  
Nuclear Fusion Reactions ◽  
Low Mass ◽  
Mass Enhancement

The ABC effect — an intriguing low-mass enhancement in the ππ invariant mass spectrum — is known from inclusive measurements of two-pion production in nuclear fusion reactions. Exclusive measurements have been carried out at CELSIUS/WASA and WASA-at-COSY for the fusion reactions leading to d, 3 He and 4 He . They all reveal this effect to be of isoscalar nature and associated with a narrow Lorentzian-shaped structure in the total cross section. The latter could point to the formation of an isoscalar resonance, which couples to the pn channel as well as to an intermediate ΔΔ state.

CHARMFUL BARYONIC $B\, \to \,{\rm{B\bar B}}'M_{c}$ DECAYS

2009 ◽  
Vol 24 (18n19) ◽  
pp. 3638-3644 ◽  
Author(s):  
YU-KUO HSIAO
Keyword(s):  
Branching Fraction ◽  
B Decays ◽  
Final State ◽  
Three Body

We study the charmful three-body baryonic B decays with D(*) or J/Ψ in the final state. We explain the measured rates of [Formula: see text], [Formula: see text], and [Formula: see text]. In particular, the branching fraction of [Formula: see text] predicted to be of order 2.3 × 10-6 is in accordance with the Belle measurement, [Formula: see text].

scholarly journals RESONANCES AND WEAK INTERACTIONS IN D+→ π+π−π+ DECAYS

2007 ◽  
Vol 16 (09) ◽  
pp. 2876-2879 ◽  
Author(s):  
DIOGO R. BOITO ◽  
BRUNO EL-BENNICH ◽  
BENOÎT LOISEAU ◽  
OLIVIER LEITNER
Keyword(s):  
Weak Interactions ◽  
Decay Amplitude ◽  
D Meson ◽  
Final State ◽  
Meson Decays ◽  
Factorization Approximation ◽  
Weak Part ◽  
Unitary Model ◽  
Final State Interactions ◽  
Three Body

We describe the ππS-wave in D+→ π+π−π+ decays using a unitary model for the ππ Final State Interactions (FSI). The three body decay is treated as a quasi two-body process where, at the weak vertex, the D meson decays into a resonance and a pion. The weak part of the decay amplitude is evaluated using the effective weak Hamiltonian within the factorization approximation.

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