UPDATE ON STATUS OF DVCS ANALYSIS FROM E1-6 DATA
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1 UPDATE ON STATUS OF ANALYSIS FROM E-6 DATA A. Movsisyan, H. Avakian, S. Pisano INFN-Ferrara Collaboration meeting 5..6
2 Introdution & Motivation e e p p Measurement of Cross Setion, via detetion of final state proton p and lepton e. Large statistis & broad kinemati overage => large overage of Φ aeptane. e6 Distribution if alulated photons photons in the fiduial volume sin(θsin(φ sin(θsin(φ E-6 experiment: olleted in -. Beam energy GeV 5m long liquid hydrogen target Average beam polarization 7% sin(θos(φ sin(θsin(φ Aram Movsisyan, DPWG meeting 5..6
3 Analysis Steps and Strategy sin(φ sin(θ sin(θ os(φ ep & ep sample is divided in subsamples spatial distributions of alulated photons ep & ep ep.5 ep sin(φ sin(θ sin(θ sin(φ ep. separate analysis of ep, ep, ep samples.. ep - to estimate exlusive pion ontribution.. ep - to validate the analysis proedure. 4. ep - ross-hek of MC normalization sin(φ.4. sin(φ.4. sin(θ.. sin(θ sin(θ sin(φ sin(θ os(φ Aram Movsisyan, DPWG meeting 5..6
4 Event Seletion & Quality harged partile momentum orretion based on m (energy loss orretions P gen. /P re p(a+b/p+/p +d/p χ / ndf 944 / 5 p.469 ±.45 p.6 ±.4 p.7 ±.76 p.9967 ±.8e 5 P Gen. /P Re < θ < < θ <6 Proton Zvertex 6 < θ < < θ <4 4 < θ <8 8 < θ < < θ <6 6 < θ <4 4 < θ <44 44 < θ <48 48 < θ <5 5 < θ <56 56 < θ < P proton Re. z-vertex orretion and uts 5 4 Lepton z vtx. before orretion Setor Setor Setor Setor 4 Setor 5 Setor Lepton z after orretion vtx. χ / ndf.7e+5 / 4 p 4.66e+5 ± 9.559e+ 5 p.6575 ±.6 p.48 ±. p 6.8e+4 ± 4.98e+ 4 p4 94 ± 9.7 p5.758e+4 ±.67e P Re. - z prot. [m] z lep lepton z vtx. [m] 5 5 lepton z lep. z - [m] z prot. [m] vtx z lep. [m] Aram Movsisyan, DPWG meeting
5 Event Seletion & Quality fiduial volume uts before the ut after the ut EC CC DC eletron DQ uts E inner >.6 E total >.4 E alo. /P σ σ 4 E lao E total >E inner E/P < P 4 5 P Aram Movsisyan, DPWG meeting
6 Exlusive pion ontribution (ep sample - MC 6 4 χ /ndf = ratio Bakground ontribution estimated from MC: N, (x, Q, t, = N N MC N MC, ( (x, Q, t, Normalization fator obtained from exlusive pion analysis: M x (epx [GeV ] - MC - MC - MC χ /ndf = ratio χ /ndf = ratio 5 5 χ /ndf = ratio φ [rad.] x Bj Q [GeV ] Aram Movsisyan, DPWG meeting
7 ep sample 5 4 ep - sample Measured photon Energy Calulated photon Energy E ep sample W > 4[GeV ] t<.5 [GeV ].8 <M x(epx <.8 [GeV ] photon f iduial volume uts Photons are deteted but not used in the event seletion Low energy photons originating from bakground proesses are not desribed by exlusive pion prodution alulated E E deteted Aram Movsisyan, DPWG meeting
8 Calulated photon spatial distribution ep sample.5 position of alulated photons sin(φ.4. sin(θ.. 5 no requierment. 4 alulated photon is in the fid. volume.. sin(φ sin(θ sin(θ os(φ position of alulated photon sin(θ os(φ E large spatial separation between deteted and alulated photons is attributed to the bakground proesses Aram Movsisyan, DPWG meeting
9 - MC (ep sample 8 6 Exl. π - MC [ep - sample] Exl. π - MC [ep - sample] χ / ndf.9 / 94 p ±.8 p.664 ±.4 p.4 ±.49 p 98.7 ±.5 p ± 9.9 p5 77 ± E M X (epx [GeV ] - MC [ep - sample] - MC [ep - sample] 9 8 Exl. π 8 7 Exl. π E alulated P lep. Suffiiently good desription of the measured yield by the simulation of two independent proesses. Aram Movsisyan, DPWG meeting
10 ep sample ep sample W > 4[GeV ] t<.5 [GeV ].8 <M x(epx <.8 [GeV ] alulated >.9 minimum ut on opening angle of alulated photons is equivalent to minimum ut on lepton propagator (imposed in simulation sin(φ sin(θ Distribution of alulated photons sin(θ os(φ M x <.8 & -t<.5 & N >.5 & P lep >.8 pe [deg.] alulated θ θ al. θ al. θ al. θ al. θ al. θ al. >.4 >.5 >.6 >.7 >.8 > P lepton propagator 4 φ [rad.] Aram Movsisyan, DPWG meeting 5..6
11 - MC (ep sample 4 8 Exl. π - MC [ep - sample] χ / ndf 66. / 94 p.e+4 ± 5.e+ p.96 ±.55 p.46 ±. p 99 ± 55. p4 5 ± 9.9 p5.98e+5 ±.e MC [ep - sample] Exl. π M X (epx [GeV ] MC [ep - sample] Exl. π Exl. π - MC [ep - sample] -t [GeV ] P lep E alulated Normalization of proess is obtained from the analysis of ep sample Good desription of data by MC simulations Aram Movsisyan, DPWG meeting 5..6
12 - MC (ep sample - MC [ep - sample] - MC [ep - sample] Exl. π Exl. π W [GeV ] - MC [ep - sample] θ alulated - MC [ep - sample] [deg.] 5 Exl. π 5 Exl. π θ [deg.] prot θ [deg.] lep. At small angles of emitted photons exlusive pion ontribution is suppressed Aram Movsisyan, DPWG meeting 5..6
13 Conlusion & Outlook a. Suffiiently good desription of data by MC simulation allows to measure via detetion of only eletron and proton. b. Further improvement of -MC omparison an be obtained onsidering additional proesses (like Δ+ prodution and radiative orretions.. Analysis proedure implemented separately on ep and ep samples is self-onsistent. a. Chek for possible ontribution from Δ+ prodution. b. Further fine tuning of seletion proedure.. Estimation of systemati unertainties for the measurement of ross setions. Thank you! Aram Movsisyan, DPWG meeting 5..6
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