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

  title={Angular distribution of polarised $\Lambda$b baryons decaying to $\Lambda$ℓ+ℓ−},
  author={Thomas Blake and Michal Kreps},
  journal={Journal of High Energy Physics},
A bstractRare b → sℓ+ℓ− flavour-changing-neutral-current processes provide important tests of the Standard Model of particle physics. Angular observables in exclusive b → sℓ+ℓ− 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 Λb → Λℓ+ℓ− is unique in that the Λb baryon can be produced polarised. In this paper, we derive an expression for the angular distribution of the Λb… 

Angular distribution of the rare decay Λ b → Λ ( → Nπ ) ` + ` −

We provide a determination of the complete angular distribution for the four body rare decay Λb → Λ(→ Nπ)`+`−, with unpolarized Λb baryons and massive leptons, in the operator basis approach which

Angular analysis of Λ⁰b→Λμ⁺μ⁻ and Λ⁰b→J/ψΛ decays with the LHCb detector

In this thesis the angular analysis of Λb → Λμ+μ− and Λb → J/ψΛ decays is presented, using data from pp collisions recorded by the LHCb experiment between 2011 and 2016, corresponding to an

The Λ b → Λ ( → pπ − ) μ + μ − decay in the RS c model

We study the four body decay Λb → Λ(→ pπ)μ+μ− in the Randall-Sundrum model with custodial protection (RSc). By considering the constraints coming from the direct searches of the lightest Kaluza-Klein

The time-dependent angular analysis of Bd → KSℓℓ, a new benchmark for new physics

Abstract We consider the time-dependent analysis of Bd→ KSℓℓ taking into account the time-evolution of the Bd meson and its mixing into $$ {\overline{B}}_d $$ B ¯ d . We discuss the

Measurement of the Lb -> J/psi Lambda angular distribution and the Lb polarisation in pp collisions

This paper presents an analysis of the Λb → J/ψΛ angular distribution and the transverse production polarisation of Λb baryons in proton-proton collisions at centre-of-mass energies of 7, 8 and 13

On the angular distribution of Λb → Λ(→ N π)τ +τ − decay

  • D. Das
  • Physics, Geology
    Journal of High Energy Physics
  • 2018
A bstractWe present a full angular distribution of the four body Λb → Λ(→ N π)ℓ+ℓ− decay where the leptons are massive and the Λb is unpolarized, in an operator basis which includes the Standard

Angular moments of the decay Λb0 → Λμ+μ− at low hadronic recoil

A bstractAn analysis of the angular distribution of the decay Λb0 → Λμ+μ− is presented, using data collected with the LHCb detector between 2011 and 2016 and corresponding to an integrated luminosity

A model-independent analysis of b → s µ + µ − transitions with GAMBIT ’s FlavBit

The search for flavour-changing neutral current effects in B -meson decays is a powerful probe of physics beyond the Standard Model. Deviations from SM behaviour are often quantified by extracting the

The Λb → Λ∗(1520)(→ NK̄)`+`− decay at low-recoil in HQET

In this paper we discuss the Standard Model and new physics sensitivity of the Λb → Λ∗(1520)(→ NK̄)`+`− decay at low-recoil, where `± are massive leptons and NK̄ = {pK−, nK̄0}. We provide a full

Prospects for New Physics searches with Λb→ Λ(1520)`+`− decays

We present the prospects of an angular analysis of the Λb→ Λ(1520)`+`− decay. Using the expected yield in the current dataset collected at the LHCb experiment, as well as the foreseen ones after the



Angular analysis of the decay Λb → Λ(→ Nπ)ℓ+ℓ−

A bstractWe study the differential decay rate for the rare Λb → Λ(→ Nπ)ℓ+ℓ− transition, including a determination of the complete angular distribution, assuming unpolarized Λb baryons. On the basis

Heavy baryons as polarimeters at colliders

A bstractIn new-physics processes that produce b or c jets, a measurement of the initial b or c-quark polarization could provide crucial information about the structure of the new physics. In the

Probing for New Physics in Polarized Λ b decays at the Z

Polarized Λb → Λγ decays at the Z pole are shown to be well suited for probing a large variety of New Physics effects. A new observable is proposed, the angular asymmetry between the Λb spin and

Rare ?b??l+l- decays with polarized ?

We investigate the rare baryonic exclusive decays of Λb → Λll (l = e, μ, τ) with polarized Λ. Under the approximation of the heavy quark effective theory (HQET), in the standard model we derive the

Heavy-to-light baryonic form factors at large recoil

A bstractWe analyze heavy-to-light baryonic form factors at large recoil and derive the scaling behavior of these form factors in the heavy quark limit. It is shown that only one universal form

Baryonic rare decays of Λb→Λl+l-

We present a systematic analysis for the rare baryonic exclusive decays ofb → �l + l − (l = e, �, τ ). We study the differential decay rates and the di-lepton forward-backward, lepton polarization

Rare decays of Λb→Λ+γ and Λb→Λ+l+l− in the light-cone sum rules

The weak decays of Λb→Λ+γ and Λb→Λ+l+l− are investigated in the standard model using the light-cone sum-rule approach. The higher-twist distribution amplitudes of the Λ baryon to the leading