Reexamining the photon polarization in 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>B</mml:mi><mml:mo stretchy="false">→</mml:mo><mml:mi>K</mml:mi><mml:mi>π</mml:mi><mml:mi>π</mml:mi><mml:mi>γ</mml:mi></mml:math>

Gronau, Michael; Pirjol, Dan

doi:10.1103/physrevd.96.013002

Cited by 12 publications

(17 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This reduces the impact of interference effects and suggests a single-resonance analysis in terms of theK 1 (1270). As stressed in the more recent Bphysics literature [13,14,22,23], insufficient understanding of the hadronic structure of theK 1 -decay prohibits a precision extraction of the photon polarization. While this can be overcome [14,23], here, we merely need to check whether the wrong-chirality amplitudes satisfy A R ∼ A L or not in a SM-like decay.…”

Section: Decay Anatomiesmentioning

confidence: 99%

“…The proportionality factor between the integrated updown asymmetry (A2) and λ γ has been estimated for thē K 1 (1270) →K 0 π + π − to be within −13% to +24%, and forK 1 (1270) → K − π + π 0 to be around −(7 − 10)% [14]. Measurement of a near maximal asymmetry would imply a small r 0 (K 1 ).…”

Section: Decay Anatomiesmentioning

confidence: 99%

“…Here, J is defined by the decay amplitude A(R → P 1 P 2 P 3 ) = μ J μ with the polarization vector of R. Formulas for J including contributions from resonances with different spin and parity, e.g., the K (1400)-family and their interference effects can be extracted from [4,[12][13][14]. Decay chains involving a kaon resonance are collected in Table 2.…”

Section: Appendix A: Up-down Asymmetrymentioning

confidence: 99%

“…The differential distribution of D → Rγ → P 1 P 2 P 3 γ decays via a J P = 1 + resonance R can be written as [4,[12][13][14] d ds 13 ds 23 …”

Section: Appendix A: Up-down Asymmetrymentioning

confidence: 99%

“…We work out the phenomenology, and provide predictions in models beyond the SM (BSM). We further suggest to study an up-down asymmetry in D →K 1 (→K ππ)γ along the lines the one known to B-decays [4,[12][13][14], as a consistency check of the SM prediction for the photon polarization. An analogous asymmetry allows to test the SM with D s → K + 1 (→ K ππ)γ decays.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

The photon polarization in radiative D decays, phenomenologically

Boer

Hiller

2018

Eur. Phys. J. C

View full text Add to dashboard Cite

We work out the phenomenology of untagged time-dependent analysis with radiative D 0 -decays into CP eigenstates, which allows to probe the photon polarization by means of the charm mesons' finite width difference. We show that D 0 → φγ or D 0 →K 0 * γ decays, which are SM-dominated, or SM-like, respectively, together with Uspin allow to obtain chirality-predictions for radiative decay amplitudes. The order of magnitude of wrong-chirality contributions in the SM can be cross-checked with an up-down asymmetry in D 0 →K 0 1 (→K ππ)γ . We explore the sensitivity to new physics in | c| = | u| = 1 dipole couplings in the decays D 0 → ρ 0 γ . We point out the possibility to test the SM with D s → K + 1 (→ K ππ)γ decays.

show abstract

Section: Decay Anatomiesmentioning

confidence: 99%

Section: Decay Anatomiesmentioning

confidence: 99%

Section: Appendix A: Up-down Asymmetrymentioning

confidence: 99%

“…The differential distribution of D → Rγ → P 1 P 2 P 3 γ decays via a J P = 1 + resonance R can be written as [4,[12][13][14] d ds 13 ds 23 …”

Section: Appendix A: Up-down Asymmetrymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The photon polarization in radiative D decays, phenomenologically

Boer

Hiller

2018

Eur. Phys. J. C

View full text Add to dashboard Cite

show abstract

On the impact of meson mixing on Bs → ϕee angular observables at low q2

Descotes-Genon

Plakias

Sumensari

2023

J. High Energ. Phys.

View full text Add to dashboard Cite

Decays based on the b → sγ transition are expected to yield left-handed photons in the Standard Model, but could be particularly sensitive to New Physics contributions modifying the short-distance Wilson coefficients $$ \mathcal{C} $$ C 7 and $$ \mathcal{C} $$ C 7′ defined in the low-energy Effective Field Theory. These coefficients can be determined by combining observables of several modes, among which Bs → ϕee at low q2, in a kinematic range where the photon-pole is dominant. We investigate the impact of Bs − $$ \overline{B} $$ B ¯ s mixing on the angular observables available for this mode, which induces a time-dependent modulation governed by interference terms between mixing and decay that are sensitive to the moduli and phases of $$ \mathcal{C} $$ C 7 and $$ \mathcal{C} $$ C 7′. These interference terms can be extracted through a time-dependent analysis but they also affect time-integrated observables. In particular, we show that the asymmetries $$ {A}_T^{(2)} $$ A T 2 and $$ {A}_T^{\left(\operatorname{Im}\right); CP} $$ A T Im ; CP receive terms of potentially similar size from mixing-independent and mixing-induced terms, and we discuss how the constraints coming from the angular analysis of Bs→ ϕee at low q2 should be interpreted in the presence of mixing.

show abstract

Parity doubling as a tool for right-handed current searches

Gratrex

Zwicky

2018

J. High Energ. Phys.

View full text Add to dashboard Cite

The V-A structure of the weak interactions leads to definite amplitude hierarchies in exclusive heavy-to-light decays mediated by b → (d, s)γ and b → (d, s) ¯ . However, the extraction of right-handed currents beyond the Standard Model is contaminated by V-A long-distance contributions leaking into right-handed amplitudes. We propose that these quantum-number changing long-distance contributions can be controlled by considering the almost parity-degenerate vector meson final states by exploiting the opposite relative sign of left-versus right-handed amplitudes. For example, measuring the time-dependent rates of a pair of vector V (J P = 1 − ) and axial A(1 + ) mesons in B → (V, A)γ, up to an order of magnitude is gained on the theory uncertainty prediction, controlled by long-distance ratios to the righthanded amplitude. This renders these decays clean probes to null tests, from the theory side. referred to as short-distance (SD) contributions hereafter, obey exact algebraic relations, leading to accidental control in the SD part. However, sizeable tree-level four-quark operators with charm and up quarks, H eff ∼d L γ µ UŪ L γ µ b (U = u, c), induce genuine long-distance (LD) effects, which are more difficult to control. It was argued, based on studying the inclusivē B → X s γ decay, that such contaminations could be rather significant [12], whereas actual computations show smaller effects in exclusive channels [13][14][15][16][17].In this article, we show that these LD effects can be controlled by a symmetry that in turn also explains the smallness found in the concrete computation [13] quoted just above. The symmetry in question is the chiral restoration limit. The crucial point is that decays of opposite parity, such asB → ρ(1 −− )γ versusB → a 1 (1 ++ )γ, are opposite in sign in the righthanded amplitude between the exact SD and LD contributions (originating from the sizeable V-A part). 1 While decays of axial mesons have received some attention as complementary probes for RHC (e.g. [21-23]), we advocate that the combination of the two decay channels allows for a cleaner extraction of the relevant observables controlled by ratios of vector to axial LD amplitudes. In light-cone approaches, this necessitates axial vector meson distribution amplitudes (DAs) [24], whose symmetry relations with vector meson DAs can be studied rather systematically [25]. For a simplified discussion of the main ideas of this paper we refer the reader to [26].The paper is organised as follows. In section 2 it is shown, using the path integral, that the fraction of LD-over SD-RHC flips sign for parity doublers. In section 3, the parity doublers are listed (section 3.1), followed by a discussion of the sources of correction to the symmetry limit in section 3.2. Applications to the time-dependent rates ofB → (V, A)γ, a detailed breakdown ofB s → φ(f 1 )γ, and remarks on B → (V, A) ¯ are presented in sections 4.1, 4.2 and 4.3 respectively. The paper ends with conclusions in section 5, including comments on the experimental feasibility of...

show abstract

Reexamining the photon polarization in B→Kππγ

Cited by 12 publications

References 54 publications

The photon polarization in radiative D decays, phenomenologically

The photon polarization in radiative D decays, phenomenologically

On the impact of meson mixing on Bs → ϕee angular observables at low q2

Parity doubling as a tool for right-handed current searches

Contact Info

Product

Resources

About