Exclusive rare decays of heavy baryons to light baryons:<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>Λ</mml:mi></mml:mrow><mml:mrow><mml:mi>b</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mo>→</mml:mo><mml:mi>Λ</mml:mi><mml:mi>γ</mml:mi></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>Λ</mml:mi></mml:mrow><mml:mrow><mml:mi>b</mml:mi></mml:mrow></mml:msub></mml:mrow

Huang, Chao-Shang; Yan, Hua-Gang

doi:10.1103/physrevd.59.114022

Cited by 78 publications

(14 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The decay rate and lepton side angular distribution has also been studied in the SM and in several extensions of the SM (NP models) in Refs. [3][4][5][6][7][8][9][10][11][12]. If the Λ b is produced polarised, a much larger number of observables are measurable.…”

Section: Introductionmentioning

confidence: 99%

Angular distribution of polarised Λb baryons decaying to Λℓ+ℓ−

Blake¹,

Kreps²

2017

J. High Energ. Phys.

View full text Add to dashboard Cite

Rare b → s + − flavour-changing-neutral-current processes provide important tests of the Standard Model of particle physics. Angular observables in exclusive b → s + − processes can be particularly powerful as they allow hadronic uncertainties to be controlled. Amongst the exclusive processes that have been studied by experiments, the decay Λ b → Λ + − is unique in that the Λ b baryon can be produced polarised. In this paper, we derive an expression for the angular distribution of the Λ b → Λ + − decay for the case where the Λ b baryon is produced polarised. This extends the number of angular observables in this decay from 10 to 34. Standard Model expectations for the new observables are provided and the sensitivity of the observables is explored under a variety of new physics models. At low-hadronic recoil, four of the new observables have a new short distance dependence that is absent in the unpolarised case. The remaining observables depend on the same short distance contributions as the unpolarised observables, but with different dependence on hadronic form-factors. These relations provide possibilities for novel tests of the SM that could be carried out with the data that will become available at the LHC or a future e + e − collider.

show abstract

Section: Introductionmentioning

confidence: 99%

Angular distribution of polarised Λb baryons decaying to Λℓ+ℓ−

Blake¹,

Kreps²

2017

J. High Energ. Phys.

View full text Add to dashboard Cite

show abstract

“…The glueball spectrum has attracted much attention more than three decades [1], and it has been widely investigated by using various non-perturbative methods. For example, from first principles calculation by using lattice QCD [2][3][4][5][6], by using flux tube model [7] as well as by using QCD sum rules [8][9][10]. For more information, please refer to review papers [11].…”

Section: Introductionmentioning

confidence: 99%

Two-gluon and trigluon glueballs from dynamical holography QCD

Chen

Huang

2016

Chinese Phys. C

View full text Add to dashboard Cite

We study the scalar, vector and tensor two-gluon and trigluon glueball spectra in the framework of 5-dimension dynamical holographic QCD model, where the metric structure is deformed self-consistently by the dilaton field. For comparison, the glueball spectra are also calculated in the hard-wall and soft-wall holographic QCD models. In order to distinguish glueballs with even and odd parities, we introduce the positive and negative coupling between the dilaton field and glueballs, and for higher spin glueballs, we introduce a deformed 5-dimension mass. With this set-up, there is only one free parameter from the quadratic dilaton profile in the dynamical holographic QCD model, which is fixed by the scalar glueball spectra. It is found that the two-gluon glueball spectra produced in the dynamical holographic QCD model are in good agreement with lattice data. Among six trigluon glueballs, the produced masses for 1 ±− and 2 −− are in good agreement with lattice data, and the produced masses for 0 −− , 0 +− and 2 +− are around 1.5 GeV lighter than lattice results. This result might indicate that the three trigluon glueballs of 0 −− , 0 +− and 2 +− are dominated by three-gluon condensate contribution.

show abstract

“…Other studies in the SM and in the context of NP have been reported in Refs. [26][27][28][29][30][31][32][33]. The b → μ + μ − angular distributions for polarized b were recently worked out in [34].…”

Section: Introductionmentioning

confidence: 99%

Model independent new physics analysis in $$\Lambda _b\rightarrow \Lambda \mu ^+\mu ^-$$ Λ b → Λ μ + μ - decay

Das

2018

Eur. Phys. J. C

View full text Add to dashboard Cite

We study the rare b → μ + μ − decay in the Standard Model and beyond. Beyond the Standard Model we include new vector and axial-vector operators, scalar and pseudo-scalar operators, and tensor operators in the effective Hamiltonian. Working in the helicity basis and using appropriate parametrization of the b → hadronic matrix elements, we give expressions of hadronic and leptonic helicity amplitudes and derive expression of double differential branching ratio with respect to dilepton invariant mass squared and cosine of lepton angle. Appropriately integrating the differential branching ratio over the lepton angle, we obtain the longitudinal polarization fraction and the leptonic forward-backward asymmetry and sequentially study the observables in the presence of the new couplings. To analyze the implications of the new vector and axial-vector couplings, we follow the current global fits to b → sμ + μ − data. While the impacts of scalar couplings can be significant, exclusiveB → X s μ + μ − data imply stringent constraints on the tensor couplings and hence the effects on b → μ + μ − are negligible.

show abstract

Exclusive rare decays of heavy baryons to light baryons:Λb→ΛγandΛb

Cited by 78 publications

References 28 publications

Angular distribution of polarised Λb baryons decaying to Λℓ+ℓ−

Angular distribution of polarised Λb baryons decaying to Λℓ+ℓ−

Two-gluon and trigluon glueballs from dynamical holography QCD

Model independent new physics analysis in $$\Lambda _b\rightarrow \Lambda \mu ^+\mu ^-$$ Λ b → Λ μ + μ - decay

Contact Info

Product

Resources

About