Photon pair production at flavour factories with per mille accuracy

Balossini, G.; Bignamini, C.; Calame, C. M. Carloni; Montagna, G.; Nicrosini, O.; Piccinini, F.

doi:10.1016/j.physletb.2008.04.007

Cited by 76 publications

(72 citation statements)

References 20 publications

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“…Concerning the latter correction, the non-perturbative hadronic contribution to the running of α is included in BabaYaga@NLO both in the lowest-order and one-loop diagrams through the HADR5N routine [16], that returns a data driven error, thus affecting the accuracy of the theoretical calculation. Analogous results about the size of radiative corrections have been obtained recently [17] for the process e + e − → γγ, also of interest for precision luminosity studies at flavour factories. As a whole, these results indicate that both exact O(α) and higher-order corrections (including vacuum polarization) are necessary for 0.1% theoretical precision.…”

Section: Numerical Resultssupporting

confidence: 75%

Mini–review on Monte Carlo programs for Bhabha scattering

Balossini

Bignamini

Calame

et al. 2008

Nuclear Physics B - Proceedings Supplements

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We review the status of Monte Carlo generators presently used for simulations of the large-angle Bhabha process at electron-positron colliders of moderately high energy (flavour factories), operating at centre-of-mass energies between about 1 GeV and 10 GeV. It is shown how the theoretical accuracy reached by present Bhabha programs for physics at flavour factories is at the level of 0.1% and, therefore, comparable with that reached about a decade ago for luminosity monitoring through small-angle Bhabha scattering at LEP.

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Section: Numerical Resultssupporting

confidence: 75%

Mini–review on Monte Carlo programs for Bhabha scattering

Balossini

Bignamini

Calame

et al. 2008

Nuclear Physics B - Proceedings Supplements

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“…The calculation has been done using and adapting (to U boson couplings) the algorithm ALPHA [31], which is an efficient tool to compute tree level matrix elements involving many Feynman diagrams. We implemented it in the Monte Carlo generator BabaYaga@NLO [32,33,34,35,36], a standard tool for luminosity measurement at flavor factories [30], to simulate distributions of experimental interest and account for realistic event selection criteria. In the U boson propagator we include the total dark photon width using the formulae of Ref.…”

Section: Theoretical Frameworkmentioning

confidence: 99%

Radiative events as a probe of dark forces at GeV-scale e + e − colliders

Barzè

Balossini²,

Bignamini

et al. 2011

Eur. Phys. J. C

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Abstract. High-luminosity e + e − colliders at the GeV scale (flavor factories) have been recently recognized to be an ideal environment to search for a light weakly coupled vector boson U (dark photon) emerging in several new physics models. At flavor factories a particularly clean channel is the production of the U boson in association with a photon, followed by the decay of the U boson into lepton pairs. Beyond the approximations addressed in previous works, we perform an exact lowest order calculation of the signal and background processes of this channel. We also include the effect of initial and final state QED corrections neglected so far, to show how they affect the distributions of experimental interest. We present new results for the expected statistical significance to a dark photon signal at KLOE/KLOE-2 and future super-B factories. The calculation is implemented in a new release of the event generator BabaYaga@NLO, which is available for full event simulations and data analysis.PACS. 12.60.Cn Extensions of electroweak gauge sector -14.70.Pw Other gauge bosons -13.66.De Lepton production in e − e + interactions -13.40.Ks Electromagnetic corrections to strong-and weak-interaction processes IntroductionIn recent years, striking astrophysical observations have failed to find an interpretation in terms of standard astrophysical or particle physics sources. Among these observations, there are the 511 KeV gamma-ray signal from the galactic center observed by the INTEGRAL satellite [7,8]. These evidences can be comprehensively interpreted by well motivated extensions of the Standard Model (SM) that predict the existence of a WIMP Dark Matter (DM) particle belonging to a secluded gauge sector under which the SM particles are uncharged [9,10,11,12,13,14]. In particular, an abelian gauge symmetry, with an associated U boson ("dark photon"), can communicate with the SM through a kinetic mixing term of the form [9,10,15]where ǫ is a kinetic mixing parameter. Annihilation of DM into the U boson, which decays into charged leptons and is light enough to kinematically forbid a decay that produces antiprotons, can explain the electron and/or positron excesses, and the absence of a similar effect in the PAMELA antiproton observations. Independently of connections with DM physics, general theoretical arguments [12,16] suggest that the kinetic mixing parameter ǫ must be naturally of the order of 10 −4 − 10 −2 , if the mixing occurs through loop effects. On the other hand the phenomenological condition M U below the GeV scale, driven by the astrophysical observations described above, requires that ǫ is in the same range in order to avoid contradiction with the available data, in particular with the constraints imposed by the precision measurements of the anomalous magnetic moment of the leptons and of the electromagnetic coupling constant [17].From a phenomenological perspective, the motivations just discussed are, perhaps, the most compelling towards postulating the existence of a new gauge boson U . It is however wort...

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“…(5) has been also applied to the e + e − → γγ process and a phenomenological study at flavour factories has been presented in Ref. [3]. As an example, in table (2) the impact of different classes of radiative corrections for typical event selection criteria at flavour factories is shown, in analogy with table (1) for Bhabha scattering.…”

Section: The Event Generator Babayaga and Babayaga@nlomentioning

confidence: 99%

Radiative corrections ine⁺e⁻collisions with the BabaYaga event generator

Calame

Carlo²

2017

EPJ Web Conf.

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Abstract. The Monte Carlo event generator BabaYaga has been developed in the last decade for high precision simulation of QED processes (e + e − → e + e − , e + e − → μ + μ − and e + e − → γγ) at flavour factories, mainly for luminometry purposes, with an estimated theoretical accuracy at the 0.1% level or better. The relevant QED radiative corrections are included by means of a QED Parton Shower matched with exact next-to-leading order corrections to reach the required accuracy. The main theoretical framework is overviewed and the status of the generator is summarized.

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Photon pair production at flavour factories with per mille accuracy

Cited by 76 publications

References 20 publications

Mini–review on Monte Carlo programs for Bhabha scattering

Mini–review on Monte Carlo programs for Bhabha scattering

Radiative events as a probe of dark forces at GeV-scale e + e − colliders

Radiative corrections ine⁺e⁻collisions with the BabaYaga event generator

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Photon pair production at flavour factories with per mille accuracy

Cited by 76 publications

References 20 publications

Mini–review on Monte Carlo programs for Bhabha scattering

Mini–review on Monte Carlo programs for Bhabha scattering

Radiative events as a probe of dark forces at GeV-scale e + e − colliders

Radiative corrections ine+e−collisions with the BabaYaga event generator

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Product

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Radiative corrections ine⁺e⁻collisions with the BabaYaga event generator