SIGNATURES OF SINGLE QUARK LINE WEAK TRANSITIONS

1994 ◽  
Vol 09 (30) ◽  
pp. 2767-2781 ◽  
Author(s):  
R. E. KARLSEN ◽  
M. D. SCADRON
Keyword(s):  
P Wave ◽  
Loop Model ◽  
Quark Loop ◽  
Weak Decays ◽  
Line Scale ◽  
Quark Line ◽  
Weak Transitions

We study the ΔI = 1/2 single quark line transition that occurs in p-wave baryon B → B′π, in radiative Ξ− → Σ−γ, in decuplet Ω− → Ξπ and in kaon K° → ππ weak decays. This leads to five empirical signatures of the single quark line scale. This scale is also predicted from a quark loop model.

NONLEPTONIC WEAK DECAYS $\bar B\to D^*_2P (V)$ IN HQET

1999 ◽  
Vol 14 (26) ◽  
pp. 1775-1782
Author(s):  
RUKMANI MOHANTA ◽  
ANJAN K. GIRI
Keyword(s):  
Decay Rates ◽  
P Wave ◽  
Weak Decays ◽  
Upper Limits

The two-body nonleptonic weak decays [Formula: see text], where [Formula: see text] is a narrow p-wave charm resonance, are investigated using the generalized factorization hypothesis along with the HQET. The estimated decay rates for these processes are below the current experimental upper limits.

B- MESON DECAYS INTO $D^0_1+P^-(V^-)$ IN HQET

1999 ◽  
Vol 14 (03) ◽  
pp. 161-168
Author(s):  
RUKMANI MOHANTA ◽  
ANJAN K. GIRI
Keyword(s):  
B Meson ◽  
Decay Rates ◽  
P Wave ◽  
B Meson Decays ◽  
Meson Decays ◽  
Weak Decays ◽  
Experimental Values

The two-body nonleptonic weak decays [Formula: see text], where [Formula: see text] is a narrow p-wave charm resonance, are investigated using the generalized factorization hypothesis along with the HQET. The estimated decay rates for these processes agree reasonably well with the current experimental values.

Radiative decays of mesons in a quark loop model

1971 ◽  
Vol 1 (1) ◽  
pp. 30-32 ◽  
Author(s):  
A. Esteve ◽  
J. León ◽  
A. Tiemblo
Keyword(s):  
Radiative Decays ◽  
Loop Model ◽  
Quark Loop

NON-LEPTONIC WEAK TRANSITIONS WITH ΔI = 1/2 RULE IN DIQUARK-QUARK MODEL USING THE PAULI-GÜRSEY SYMMETRY

1994 ◽  
Vol 09 (12) ◽  
pp. 1059-1069 ◽  
Author(s):  
K. SUZUKI ◽  
H. TOKI
Keyword(s):  
Quark Model ◽  
Ground State ◽  
Wave Functions ◽  
P Wave ◽  
Standard Process ◽  
Weak Process ◽  
Pion Emission ◽  
Spin Singlet ◽  
Weak Transitions

We study the non-leptonic weak transitions of ground state baryons in diquark-quark model. These weak transitions exhibit the ΔI = 1/2 rule, which is hard to account for in the standard weak process. If the diquark correlations are strong among flavor-antitriplet and spin-singlet pairs, we can make the weak transitions among diquarks followed by pion emission much stronger than the standard process. We estimate all the non-leptonic weak transitions of ground state baryons by assuming the Pauli-Gürsey symmetry together with the SU(6) wave functions. We can account for all the P-wave transition strengths quantitatively and hence the ΔI = 1/2 rule.

Quark loop model of radiative meson decays

1979 ◽  
Vol 2 (1) ◽  
pp. 23-28 ◽  
Author(s):  
Norma M. Chase ◽  
Michael T. Vaughn
Keyword(s):  
Loop Model ◽  
Quark Loop ◽  
Meson Decays ◽  
Radiative Meson Decays

scholarly journals Erratum to: Radiative decays of mesons in a quark-loop model

1971 ◽  
Vol 1 (4) ◽  
pp. 174-174
Author(s):  
A. Esteve ◽  
J. León ◽  
A. Tiemblo
Keyword(s):  
Radiative Decays ◽  
Loop Model ◽  
Quark Loop

Radiative pion decay in a simple quark loop model

1976 ◽  
Vol 54 (2) ◽  
pp. 158-163 ◽  
Author(s):  
L. Resnick ◽  
J. H. Kim
Keyword(s):  
Basic Assumption ◽  
Dimensional Regularization ◽  
Weak Decay ◽  
Coupling Constants ◽  
Pion Decay ◽  
Loop Model ◽  
Quark Loop ◽  
Quark Masses ◽  
The One ◽  
The Masses

The weak decay of pions into leptons and into leptons plus photon is examined in a simple model at the one loop level. A basic assumption made is that there is more than one pair of quarks to which the pion couples and the masses and coupling constants are such that all amplitudes are finite. The amplitudes are defined by means of dimensional regularization and gauge invariance is rigorously maintained throughout. The experimental lifetimes for charged and neutral pion decay give one constraint among the quark masses and the parameter γ, the ratio of structure dependent axial to vector form factor, gives a second. Quark masses can be found to satisfy either condition, but no solution exists for both constraints simultaneously.

scholarly journals CP VIOLATION AND ΔI=1/2 ENHANCEMENT FOR K→ππ, K→ππγ WEAK DECAYS

2004 ◽  
Vol 19 (30) ◽  
pp. 2267-2278 ◽  
Author(s):  
MICHAEL D. SCADRON ◽  
GEORGE RUPP ◽  
EEF VAN BEVEREN
Keyword(s):  
Cp Violation ◽  
Quark Model ◽  
Excellent Agreement ◽  
Constituent Quark ◽  
Branching Ratios ◽  
Constituent Quark Model ◽  
Quark Loop ◽  
Mixing Angle ◽  
Weak Decays ◽  
Rate Asymmetry

Data indicate that ΔI=3/2 transitions account for 4.5–4.7% of both CP conserving and CP violating K→2π decays, as well as CP conserving radiative K→ππγ processes. Observed K→ππγ/ππ branching ratios are shown to scale near α/π or α/2π. The KL–KS mixing angle ϕ and the semileptonic weak-rate asymmetry δ are reviewed, and theory is shown to be consistent with data. Also, K→2π ΔI=1/2 dominance is studied in the context of the chiral constituent quark model, displaying again excellent agreement with data. Finally, indirect and direct kaon CP violation (CPV) are successfully described in the framework of photon-mediated quark-loop graphs. This suggests that kaon CPV can be understood via second-order weak transitions, radiatively corrected.

Sign in / Sign up

Export Citation Format

Share Document