Light gluino and the running of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>α</mml:mi></mml:mrow><mml:mrow><mml:mi>s</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>

Chiang, Cheng‐Wei; Luo, Zumin; Rosner, Jonathan L.

doi:10.1103/physrevd.67.035008

Cited by 60 publications

(100 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…One involves the exchange processbd →cu, followed by the fragmentation ofcu toD 0 pp. Such processes are expected to be suppressed in other B decays (see, e.g., [31]) and there is no reason to expect them to play a major role here.…”

Section: Fragmentation Mechanismsmentioning

confidence: 99%

Low-mass baryon-antibaryon enhancements inBdecays

Rosner

2003

Phys. Rev. D

Self Cite

View full text Add to dashboard Cite

The nature of low-mass baryon-antibaryon enhancements seen in B decays is explored. Three possibilities include (i) states near threshold as found in a model by Nambu and Jona-Lasinio, (ii) isoscalar states with J P C = 0 ±+ coupled to a pair of gluons, and (iii) low-mass enhancements favored by the fragmentation process. Ways of distinguishing these mechanisms using angular distributions and flavor symmetry are proposed.

show abstract

Section: Fragmentation Mechanismsmentioning

confidence: 99%

Low-mass baryon-antibaryon enhancements inBdecays

Rosner

2003

Phys. Rev. D

Self Cite

View full text Add to dashboard Cite

show abstract

“…The large phase of E is suggestive of nearby resonance effects. The three amplitudes T , C and E in B → Dπ decays can be individually determined from the measurements of Dπ in conjunction with the data of D + s K − and D 0 η [51]. In the factorization approach, the short-distance factorizable amplitudes read…”

Section: B → Dπ Decaysmentioning

confidence: 99%

Final state interactions in hadronicBdecays

2005

View full text Add to dashboard Cite

There exist many experimental indications that final-state interactions (FSIs) may play a prominent role not only in charmful B decays but also in charmless B ones. We examine the final-state rescattering effects on the hadronic B decay rates and their impact on direct CP violation. The color-suppressed neutral modes such as B 0 → D 0 π 0 , π 0 π 0 , ρ 0 π 0 , K 0 π 0 can be substantially enhanced by long-distance rescattering effects. The direct CP -violating partial rate asymmetries in charmless B decays to ππ/πK and ρπ are significantly affected by final-state rescattering and their signs are generally different from that predicted by the short-distance approach. For example, direct CP asymmetry in B 0 → ρ 0 π 0 is increased to around 60% due to final state rescattering effects whereas the short-distance picture gives about 1%. Evidence of direct CP violation in the decay B 0 → K − π + is now established, while the combined BaBar and Belle measurements of B 0 → ρ ± π ∓ imply a 3.6σ direct CP asymmetry in the ρ + π − mode. Our predictions for CP violation agree with experiment in both magnitude and sign, whereas the QCD factorization predictions (especially for ρ + π − ) seem to have some difficulty with the data. Direct CP violation in the decay B − → π − π 0 is very small ( < ∼ 1%) in the Standard Model even after the inclusion of FSIs. Its measurement will provide a nice way to search for New Physics as in the Standard Model QCD penguins cannot contribute (except by isospin violation). Current data on πK modes seem to violate the isospin sum rule relation, suggesting the presence of electroweak penguin contributions. We have also investigated whether a large transverse polarization in B → φK * can arise from the final-state rescattering of D ( * )D ( * ) s into φK * . While the longitudinal polarization fraction can be reduced significantly from short-distance predictions due to such FSI effects, no sizable perpendicular polarization is found owing mainly to the large cancellations occurring in the processes B → D * sD → φK * and B → D sD * → φK * and this can be understood as a consequence of CP and SU(3) [CPS] symmetry. To fully account for the polarization anomaly (especially the perpendicular polarization) observed in B → φK * , FSI from other states or other mechanism, e.g. the penguin-induced annihilation, may have to be invoked. Our conclusion is that the small value of the longitudinal polarization in V V modes cannot be regarded as a clean signal for New Physics.

show abstract

“…Hence, for D → P P, V P, V V decays, only T , C, E and A contribute. The reduced quark-graph amplitudes T, C, E, A have been extracted from Cabibbo-allowed D → P P decays by Rosner [8,57] Hence, the weak annihilation (W -exchange E or W -annihilation A) amplitude has a sizable magnitude comparable to the color-suppressed internal W -emission amplitude C with a large phase relative to the tree amplitude T . As discussed in [5], it receives long-distance contributions from nearby resonance via inelastic final-state interactions from the leading tree or color-suppressed amplitude.…”

Section: Quark Diagram Scheme and Final-state Interactionsmentioning

confidence: 99%

HadronicDdecays involving scalar mesons

Cheng

2003

Phys. Rev. D

View full text Add to dashboard Cite

The nonleptonic weak decays of charmed mesons into a scalar meson and a pseudoscalar meson are studied. The scalar mesons under consideration are σ [or f 0 (600)], κ, f 0 (980), a 0 (980) and K * 0 (1430). A consistent picture provided by the data suggests that the light scalars below or near 1 GeV form an SU(3) flavor nonet and are predominately the q 2q2 states, while the scalar mesons above 1 GeV can be described as a qq nonet. Hence, we designate q 2q2 to σ, κ, a 0 (980), f 0 (980) and qq to K * 0 . Sizable weak annihilation contributions induced from final-state interactions are essential for understanding the data. Except for the Cabibbo doubly suppressed channel D + → f 0 K + , the data of D → σπ, f 0 π, f 0 K, K * 0 π can be accommodated in the generalized factorization approach. However, the predicted rates for D → a 0 π, a 0 K are too small by one to two orders of magnitude when compared with the preliminary measurements. Whether or not one can differentiate between the two-quark and four-quark pictures for the f 0 (980) produced in the hadronic charm decays depends on the isoscalar f 0 −σ mixing angle in the qq model.

show abstract

Light gluino and the running ofαs

Cited by 60 publications

References 36 publications

Low-mass baryon-antibaryon enhancements inBdecays

Low-mass baryon-antibaryon enhancements inBdecays

Final state interactions in hadronicBdecays

HadronicDdecays involving scalar mesons

Contact Info

Product

Resources

About