BHWIDE 1.00: O(α) YFS exponentiated Monte Carlo for Bhabha scattering at wide angles for LEP1/SLC and LEP2

Abstract

We present O(α) YFS exponentiated results for wide angle Bhabha scattering at LEP/SLC energies using a new Monte Carlo event generator BHWIDE 1.xx. Our calculations include two options for the pure weak corrections, as presented in Beenakker et al. and in Böhm et al. From comparison with the results of Beenakker et al., Montagna et al. and Cacciari et al., we conclude that the total precision of our BHWIDE results is 0.3%(0.5%) in the LEP1/SLC regime within ±100 MeV (+2.75/−2.5 GeV) of the Z peak. For LEP2, the corresponding precision is currently estimated at 1.5%; the latter could be improved if the data in LEP2 so require. Both precision tags represent clear improvements over what is currently available in the literature. 1 We note that Kleiss and Stirling [8] have introduced analogous methods as well.

Matching perturbative and parton shower corrections to Bhabha process at flavour factories

“…To this end, we first compared the results for the integrated cross section as obtained by the improved version of BABAYAGA with the corresponding predictions of LABSPV [33] and BHWIDE [17], which both rely on different theoretical ingredients. For the sake of comparison, the contribution of vacuum polarization has been switched off, in order to test just the implementation of pure QED corrections.…”

“…[15] (based on Ref. [16]) and the Yennie-Frautschi-Suura tool BHWIDE [17], are also employed by the experimental collaborations. A generally good agreement between theory and data, as well as between the results of the different generators, is observed, thus confirming the precision claims of the respective calculations [10,14,18].…”

Search for Di-Muon Decays of a Light Scalar Higgs Boson in Radiative Upsilon(1S) Decays

“…and generic Υ(2S , 3S ) production, BHWIDE [72] to simulate the Bhabha scattering and KK2F [73] to simulate the decay processes of e + e − → (γ)µ + µ − (radiative di-muon) and…”

Determination of the LEP beam energy using radiative fermion-pair events

“…In this scheme, ISR is modelled with Coherent Exclusive Exponentiation (CEEX) [11] to O(α 2 ) precision. For the e + e − (nγ ) final-state process, BHWIDE [12] (v.1.00) is employed, in which ISR 25 OPAL uses a right-handed coordinate system in which the z axis is along the electron beam direction and the x axis is horizontal. The polar angle θ is measured with respect to the z axis and the azimuthal angle φ with respect to the x axis.…”