Predictions for 
                ${\bar \nu} \nu \gamma$
               production at LEP

Bardin, D. Y.

doi:10.1007/s100520200948

Cited by 18 publications

(13 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(2.9-2.11) in Ref. [18]. We have checked that we reproduce benchmark Table 1 of Born cross sections and forwardbackward asymmetries 2 in this paper.…”

Section: The Methodssupporting

confidence: 72%

“…Before the end of LEP era matrix element of KKMC for neutrino pair production process was upgraded and documented in a fine detail in Ref. [18]. In particular W -exchange diagram for electron neutrino channel was implemented and the electroweak (EW) library DIZET, the same as in ZFITTER [30], was added.…”

Section: Matrix Element Of Kkmcmentioning

confidence: 99%

“…Strictly speaking, as explained in Ref. [18], one-loop corrections to W -exchange contribution for the electron neutrino pair process in KKMC are taken in certain low energy approximation and will have to be improved in the future.…”

Section: Matrix Element Of Kkmcmentioning

confidence: 99%

See 2 more Smart Citations

Precision measurement of the Z boson to electron neutrino coupling at the future circular colliders

Aleksan

Jadach

2019

Physics Letters B

View full text Add to dashboard Cite

At the high luminosity electron-positron circular colliders like FCC-ee in CERN and CEPC in China it will possible to measure very precisely e + e − → Zγ process with subsequent Z decay into particles invisible in the detector, that is into three neutrina of the Standard Model and possibly into other weakly coupled neutral particles. Apart from the measurement of the total invisible width (which is not the main subject of this work) this process may be used as a source of Z coupling to electron neutrino -known very poorly. This is possible due to the presence of the tchannel W exchange in the e + e − → ν eνe γ channel which deforms slightly spectrum of the photon. We are going to show experimental investigation of this effect, for ∼ 10 inverse atobarn accumulated luminosity, which can provide measurement of the Z − ν e coupling with statistical error of order 1%. The estimation of the systematic experimental error will require more work, but most likely it will be of similar size.

show abstract

“…(2.9-2.11) in Ref. [18]. We have checked that we reproduce benchmark Table 1 of Born cross sections and forwardbackward asymmetries 2 in this paper.…”

Section: The Methodssupporting

confidence: 72%

Section: Matrix Element Of Kkmcmentioning

confidence: 99%

See 1 more Smart Citation

Precision measurement of the Z boson to electron neutrino coupling at the future circular colliders

Aleksan

Jadach

2019

Physics Letters B

View full text Add to dashboard Cite

show abstract

“…Let us point to another theoretical constraint restricting naive resummation. It could be observed that even in the case of initial state QED bremsstrahlung for the process e + e − → ν eνe , previously performed step of resummation had to be partially revisited, because of amplitude featuring t -channel W exchange [19]. For the complete second order matrix element of the two hard photon emission the diagrams of charged pseudo-Goldstone boson exchange had to be taken into account [20].…”

Section: Introductionmentioning

confidence: 99%

QED bremsstrahlung in decays of electroweak bosons

2013

View full text Add to dashboard Cite

Isolated lepton momenta, in particular their directions are the most precisely measured quantities in pp collisions at LHC. This offers opportunities for multitude of precision measurements.It is of practical importance to verify if precision measurements with leptons in the final state require all theoretical effects evaluated simultaneously or if QED bremsstrahlung in the final state can be separated without unwanted precision loss.Results for final-state bremsstrahlung in the decays of narrow resonances are obtained from the Feynman rules of QED in an unambiguous way and can be controlled with a very high precision. Also for resonances of non-negligible width, if calculations are appropriately performed, such separation from the remaining electroweak effects can be expected.Our paper is devoted to validation that final-state QED bremsstrahlung can indeed be separated from the rest of QCD and electroweak effects, in the production and decay of Z and W bosons, and to estimation of the resulting systematic error. The quantitative discussion is based on Monte Carlo programs PHOTOS and SANC, as well as on KKMC which is used for benchmark results. We show that for a large class of W and Z boson observables as used at LHC, the theoretical error on photonic bremsstrahlung is 0.1 or 0.2 %, depending on the program options used. An overall theoretical error on the QED final-state radiation, i.e. taking into account missing corrections due to pair emission and interference with initial state radiation is estimated respectively at 0.2 % or 0.3 % again depending on the program option used. a

show abstract

“…This presentation is based mainly on three recent papers [1,2,3]. Standard Model calculations for LEP with YFS exponentiation are implemented in many Monte Carlo event generators: for e + e − → ff + nγ, f = τ, µ, d, u, s, c process: (1a) YFS1 (1987)(1988)(1989)) O(α 1 ) exp ISR [4], (1b) YFS2∈KORALZ (1989-1990) O(α 1 + h.o.LL) exp ISR [5,6], (1c) YFS3∈KORALZ (1990-1998 O(α 1 + h.o.LL) exp ISR+FSR [7,8], (1d) KKMC (1998-02) O(α 2 + h.o.LL) exp ISR+FSR+Interf.…”

mentioning

confidence: 99%