The Phokhara and Ekhara event generators

Transcription

1 The Phokhara and Ekhara event generators H. CZYŻ, IF, UŚ, Katowice, Poland International Workshop on e + e Collisions from φ to ψ, 2017 Mainz, June 2017

2 Outline Motivation PHOKHARA and EKHARA in brief Recent developments in PHOKHARA and EKHARA χ c1 and χ c2 production UŚ, Katowice, PHOKHARA and EKHARA MC generators, 2

3 Outline Work in progress: PHOKHARA e + e Pγ(γ) ISR NNLO Work in progress: EKHARA New P γ γ form factors Radiative corrections Concluding remarks UŚ, Katowice, PHOKHARA and EKHARA MC generators, 3

4 The reason we need R(s) a had,lo µ = α2 3π 2 m 2 π ds s K(s) R(s) R(s) = σ(e+ e hadrons) σ point One has to measure : σ(e + e hadrons) UŚ, Katowice, PHOKHARA and EKHARA MC generators, 4

5 THE RADIATIVE RETURN METHOD dσ(e + e hadrons + γ(isr)) = H(Q 2,θ γ ) dσ(e + e hadrons)(s = Q 2 ) measurement of R(s) over the full range of energies, from threshold up to s large luminosities of factories compensate α/π from photon radiation radiative corrections essential (NLO,...) High precision measurement of the hadronic cross-section at meson-factories UŚ, Katowice, PHOKHARA and EKHARA MC generators, 5

6 PHOKHARA MC generator EVA: e + e π + π γ tagged photon (θ γ > θ cut ) ISR at LO + Structure Function FSR: point-like pions e + e 4π + γ [Binner et al.] ISR at LO + Structure Function [Czyż, Kühn,2000] F. Campanario, H.C., J. Gluza, PHOKHARA 9.2: π + π, µ + µ, 4π, NN, 3π, KK,Λ Λ J/ψ,ψ(2S), χ c1,χ c2 ISR at NLO: virtual corrections to one photon events and two photon emission at tree level γ γ 2 γ 2 γ + + A. Grzelińska, M. Gunia, J. H. Kühn, E. Nowak-Kubat, T. Riemann, G. Rodrigo, Sz. Tracz, A. Wapienik, V. Yundin, D. Zhuridov FSR at NLO:π + π, µ + µ,k + K, pp tagged or untagged photons e + e hadrons (muons) ISR at NNLO Modular structure UŚ, Katowice, PHOKHARA and EKHARA MC generators, 6

7 Photon-photon interactions UŚ, Katowice, PHOKHARA and EKHARA MC generators, 7

8 EKHARA MC generator 1.0: e + e π + π e + e background to e + e π + π γ Henryk Czyż, Elżbieta Nowak-Kubat, Phys. Lett. B 634, 493 (2006), EKHARA 2.2: π + π, π 0, η, η, χ ci, χ ci J/ψ( µ + µ )γ 2.1: e + e π 0 e + e Henryk Czyż, Sergiy Ivashyn, Com.Phys.Commun. 182(2011) A. Korchin, O. Shekhovtsova, P. Kisza p 2 q 2 p 1 Q q 1 Modular structure radiative correction to be included soon ekhara/ UŚ, Katowice, PHOKHARA and EKHARA MC generators, 8

9 χ c1 and χ c2 production at e + e colliders. σ (nb) H. Czyż, J. H. Kühn, Sz. Tracz, Phys. Rev. D94 (2016), e + e µ + µ γ: talk by J. H. Kühn ; o < θ γ < 160 o 20 o < θ µ,µ + < 160 o M χc1 = GeV s(gev) ISR background ISR+QED signal ISR+QED signal+z σ (nb) 20 o < θ γ < 160 o 20 o < θ µ,µ + < 160 o M χc2 = GeV s(gev) UŚ, Katowice, PHOKHARA and EKHARA MC generators, ISR background ISR+QED signal

10 χ ci production at e + e colliders. H. Czyż, P. Kisza, Phys.Lett. B771 (2017) 487 e + e e + e χ ci ( J/ψ( µ + µ )γ): P. Kisza: poster session and RadioMonteCarLow satelite meeting e + p 1 e + q 1 µ + q 4 l 1 χ ci q J/ψ l q 3 µ l 2 k 1 γ p 2 e q 2 e UŚ, Katowice, PHOKHARA and EKHARA MC generators, 10

11 BELLE II event rates H. Czyż, P. Kisza, Phys.Lett. B771 (2017) χ c0 χ c1 χ c2 N ev l 2 1 UŚ, Katowice, PHOKHARA and EKHARA MC generators, 11

12 BELLE II event rates H. Czyż, P. Kisza, Phys.Lett. B771 (2017) 487 N ev l 2 1 [GeV 2 ] χ c l2 2[GeV 2 ] UŚ, Katowice, PHOKHARA and EKHARA MC generators, 12

13 Work in progress: e + e Pγ(γ) H. Czyż, P.Kisza, Sz. Tracz, in preparation Sz. Tracz: poster session and RadioMonteCarLow satelite meeting UŚ, Katowice, PHOKHARA and EKHARA MC generators, 13

14 e + e e + e π 0 H. Czyż, P.Kisza, Sz. Tracz, in preparation Sz. Tracz: poster session and RadioMonteCarLow satelite meeting dσ[f ull] dσ[approx] dσ[f ull] π 0 η η E cm = 10.58[GeV ] 2 octets 3 octets Q 2 [GeV 2 ] UŚ, Katowice, PHOKHARA and EKHARA MC generators, 14

15 Phys.Lett. B753 (2016) 629 BESIII new results UŚ, Katowice, PHOKHARA and EKHARA MC generators, 15

16 PENTABOXES For muons only, for pions in progress UŚ, Katowice, PHOKHARA and EKHARA MC generators, 16

17 F. Campanario, (Valencia) The team H.C., J. Gluza, T. Jeliński, Sz. Tracz, D. Zhuridov (Katowice) T. Riemann (DESY, Zeuthen) Status sqed + form factors: two independent codes ready sqed + form factors: going on tests the code(s) partly tested hoping to finish this year UŚ, Katowice, PHOKHARA and EKHARA MC generators, 17

18 The task: PENTABOXES-pions D. Zhuridov: poster session and RadioMonteCarLow satelite meeting + UŚ, Katowice, PHOKHARA and EKHARA MC generators, 18

19 Size of the new corrections JHEP 1402 (2014) 114 UŚ, Katowice, PHOKHARA and EKHARA MC generators, 19

20 Size of the new corrections JHEP 1402 (2014) 114 UŚ, Katowice, PHOKHARA and EKHARA MC generators, 20

21 Size of the pentaboxes JHEP 1402 (2014) 114 UŚ, Katowice, PHOKHARA and EKHARA MC generators, 21

22 Size of the new corrections - pions ISR pentabox ISR pentabox dσ nb [ ] dq 2 GeV pentabox born Q 2 [GeV 2 ] Q 2 [GeV 2 ] UŚ, Katowice, PHOKHARA and EKHARA MC generators, 22

23 ISR NNLO The goal: Accuracy of the radiator function: 0.5% % Time scale: 1.5 years UŚ, Katowice, PHOKHARA and EKHARA MC generators, 23

24 Concluding remarks Slow progress, but hoping to be of help In about 2 years the accuracy of PHOKHARA should be at % This year: radiative corrections in EKHARA UŚ, Katowice, PHOKHARA and EKHARA MC generators, 24