Recent results on DVCS from Hall A at JLab
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1 Recent results on DVCS from Hall A at JLab Carlos Muñoz Camacho IPN-Orsay, CNRS/IN2P3 (France) Spatial and Momentum Tomography of Hadrons and Nuclei INT-17-3 Sep 5, 2017 Carlos Muñoz Camacho (IPN-Orsay) New DVCS results from Hall A INT / 23
2 Outline Introduction 1 Very brief experimental introduction to DVCS 2 Recent DVCS results from Hall A at JLab DVCS: beam energy dependence of the cross section (arxiv: ) π O : off the neutron flavor separation (arxiv: ) J. Roche s talk on Thursday 3 Outlook Jefferson Lab at 12 GeV: Hall A C programs Carlos Muñoz Camacho (IPN-Orsay) New DVCS results from Hall A INT / 23
3 Introduction Motivation Deeply Virtual Compton Scattering (DVCS): γ p γ p High Q 2 Perturbative QCD Non-perturbative GPDs Handbag diagram Bjorken limit: Q 2 = q 2 ν } x B = Q2 2Mν fixed GPDs accesible through DVCS only at Q 2 Actual value of Q 2 must be tested and established by experiment Carlos Muñoz Camacho (IPN-Orsay) New DVCS results from Hall A INT / 23
4 Introduction Experiment DVCS experimentally: interference with Bethe-Heitler At leading twist: d 5 σ d 5 σ = 2 Im (T BH T DVCS ) d 5 σ +d 5 σ = BH Re (T BH T DVCS ) + DVCS 2 +1 T DVCS = +1 1 H(x, ξ, t) P dx 1 x ξ }{{} Access in helicity-independent cross section H(x, ξ, t) dx x ξ + iɛ + = iπ H(x = ξ, ξ, t) +... }{{} Access in helicity-dependent cross-section Carlos Muñoz Camacho (IPN-Orsay) New DVCS results from Hall A INT / 23
5 Leading twist GPDs Introduction Experiment 8 GPDs related to the different combination of quark/nucleon helicities 4 chiral-even GPDs: conserve the helicity of the quark Access through DVCS (and DVMP) Carlos Muñoz Camacho (IPN-Orsay) New DVCS results from Hall A INT / 23
6 Leading twist GPDs Introduction Experiment 8 GPDs related to the different combination of quark/nucleon helicities 4 chiral-odd GPDs: flip helicity of the quark transversity GPDs Experimental access more complicated (π 0 electroproduction?) Ahmad, Goldstein, Liuti (2009) Goloskokov, Kroll (2011) Carlos Muñoz Camacho (IPN-Orsay) New DVCS results from Hall A INT / 23
7 Experiment Kinematic settings: testing Q 2 dependance Kin Q 2 x B θ e θ γ P e (GeV 2 ) (deg.) (deg.) (GeV) P = 75.3% L dt = fb 1 (3.26 Coulombs) Carlos Muñoz Camacho (IPN-Orsay) New DVCS results from Hall A INT / 23
8 Experiment E experimental setup High Resolution Spectrometer 100-channel scintillator array PbF2 electromagnetic calorimeter Carlos Mun oz Camacho (IPN-Orsay) New DVCS results from Hall A INT / 23
9 Experiment Data analysis: exclusivity and background subtraction ep eγx missing mass squared Pion center of mass Laboratory frame Direction of the boost Direction of the boost θ Symmetric decay Asymmetric decay Only e & γ detected + M 2 X -cut 2-3% uncertainty on exclusivity Carlos Muñoz Camacho (IPN-Orsay) New DVCS results from Hall A INT / 23
10 Results E DVCS cross sections: azimuthal analysis Q 2 = 2.36 GeV 2, x B = 0.37, t = 0.32 GeV 2 d 4 σ = T 2 BH + T BHRe(T DVCS ) + T 2 DVCS Re(T DVCS ) c I 0 + c I 1 cos φ + c I 2 cos 2φ TDVCS 2 cdvcs 0 + c DVCS 1 cos φ 4 σ = d4 σ d 4 σ = Im(T DVCS ) 2 Im(T DVCS ) s I 1 sin φ + s I 2 sin 2φ M. Defurne et al. Phys. Rev. C 92, (2015) Carlos Muñoz Camacho (IPN-Orsay) New DVCS results from Hall A INT / 23
11 Results E DVCS cross sections: Q 2 dependance No Q 2 -dependance within limited range leading twist dominance Phys. Rev. C92 (2015) Carlos Muñoz Camacho (IPN-Orsay) New DVCS results from Hall A INT / 23
12 Results E DVCS cross sections: higher twist corrections KM10a: global fit to HERA x-sec & HERMES + CLAS spin asymmetries Kumericki and Mueller (2010) Carlos Muñoz Camacho (IPN-Orsay) New DVCS results from Hall A INT / 23
13 Results E DVCS cross sections: higher twist corrections KM10a: global fit to HERA x-sec & HERMES + CLAS spin asymmetries Kumericki and Mueller (2010) Target-mass corrections (TMC): O(M 2 /Q 2 ) and O(t/Q 2 ) Braun, Manashov, Mueller and Pirnay (2014) Carlos Muñoz Camacho (IPN-Orsay) New DVCS results from Hall A INT / 23
14 Results E DVCS process: leading twist ambiguity DVCS defines a preferred axis: light-cone axis At finite Q 2 and non-zero t, there is an ambiguity: 1 Belitsky et al. ( BKM, ): light-cone axis in plane (q,p) 2 Braun et al. ( BMP, 2014): light-cone axis in plane (q,q ) easier to account for kin. corrections O(M 2 /Q 2 ), O(t/Q 2 ) F ++ = F ++ + χ 2 [F ++ + F + ] χ 0 F 0+ F + = F + + χ 2 [F ++ + F + ] χ 0 F 0+ F 0+ = (1 + χ)f 0+ + χ 0 [F ++ + F + ] F + = 0 F 0+ = 0 F ++ = (1 + χ 2 )F ++ F + = χ 2 F ++ F 0+ = χ 0 F ++ (eg. χ 0 = 0.25, χ = 0.06 for Q 2 = 2 GeV 2, x B = 0.36, t = 0.24 GeV 2 ) Carlos Muñoz Camacho (IPN-Orsay) New DVCS results from Hall A INT / 23
15 Results E Rosenbluth-like separation of the DVCS cross section σ(ep epγ) = BH 2 + I(BH DVCS) + DVCS 2 }{{}}{{}}{{} Known to 1% Linear combination of GPDs Bilinear combination of GPDs I 1/y 3 = (k/ν) 3, T DVCS 2 1/y 2 = (k/ν) 2 BKM-2010 at leading twist 7 independent GPD terms: { Re, Im [ C I, C I,V, C I,A] (F) }, and C DVCS (F, F ). ϕ-dependence provides 5 independent observables: 1, cos ϕ, sin ϕ, cos(2ϕ), sin(2ϕ) The measurement of the cross section at two or more beam energies for exactly the same Q 2, x B, t kinematics, provides the additional information in order to extract all leading twist observables independently. Carlos Muñoz Camacho (IPN-Orsay) New DVCS results from Hall A INT / 23
16 Results E E07-007: DVCS beam-energy dependence Cross section measured at 2 beam energies and constant Q 2, x B, t E = 4.5 GeV E = 5.6 GeV Leading-twist and LO simultaneous fit of both beam energies (dashed line) does not reproduce the data Light-cone axis in the (q,q ) plane (Braun et al.): H ++, H ++, E ++, Ẽ++ Carlos Muñoz Camacho (IPN-Orsay) New DVCS results from Hall A INT / 23
17 Results E Beyond Leading Order (LO) and Leading Twist (LT) Two fit-scenarios: Light-cone axis in the (q,q0 ) plane (Braun et al.) LO/LT + HT e ++, H0+, H e 0+ H++, H LO/LT + NLO e ++, H +, H e + H++, H Carlos Mun oz Camacho (IPN-Orsay) New DVCS results from Hall A INT / 23
18 Results E E07-007: DVCS beam-energy dependence Cross section measured at 2 beam energies and constant Q 2, x B, t 4 nb/gev σ 4 d σ Fit LT/LO Fit HT KM nb/gev Φ (deg) Φ (deg) Leading-twist and LO simultaneous fit of both beam energies (dashed line) does not reproduce the data Including either NLO or higher-twist effects (dark solid line) satisfactorily reproduce the angular dependence Carlos Muñoz Camacho (IPN-Orsay) New DVCS results from Hall A INT / 23
19 4 4 Results E DVCS 2 and I (DVCS BH) separation DVCS 2 and I (DVCS BH) separated in NLO and higher-twist scenarios nb/gev 0.04 nb/gev DVCS 2 & I significantly different in each scenario DVCS ++/-+ Interference ++/-+ 2 DVCS ++/0+ Interference ++/ Sizeable DVCS 2 contribution in the higher-twist scenario in the helicity-dependent cross section Φ (deg) Φ (deg) arxiv: Carlos Muñoz Camacho (IPN-Orsay) New DVCS results from Hall A INT / 23
20 12 GeV Hall A E : JLab Hall A at 11 GeV JLab12 with 3, 4, 5 pass beam (6.6, 8.8, 11.0 GeV beam energy) DVCS measurements in Hall A/JLab ) 2 (GeV 2 Q W <4 GeV Unphysical with E 11 GeV beam E beam = 6.6 GeV E beam = 8.8 GeV E beam = 11.0 GeV E beam = 5.75 GeV xbj 88 days 250k events/setting Carlos Muñoz Camacho (IPN-Orsay) New DVCS results from Hall A INT / 23
21 12 GeV 1 st Hall A experiment after the Upgrade ( ) DVCS Cumulated Statistics - Status Hall A Identification of DVCS events: online ep eγx missing mass squared Could not go back and complete kin48_[234] because of beam energy 50% change ofover the the required summer. beamtime completed Data analysis underway Carlos Muñoz Camacho (IPN-Orsay) New DVCS results from Hall A INT / 23
22 12 GeV E : DVCS in Hall C Hall C HMS (p < 7.3GeV): scattered electron PbWO 4 calorimeter: γ/π 0 detection Sweeping magnet Carlos Muñoz Camacho (IPN-Orsay) New DVCS results from Hall A INT / 23
23 12 GeV Hall C 11 (and 8.8 and 6.6) GeV program in Halls A & C - Approved high precision DVCS & π 0 programs in Halls A & C Hall A 50% of data already collected ( ): analysis underway... Inaccessible with E b <11 GeV Resonance region W < 2 GeV Hall C program could start : Neutral Particle Spectrometer (NPS) under construction Carlos Muñoz Camacho (IPN-Orsay) New DVCS results from Hall A INT / 23
24 Summary Conclusion Recent high precision DVCS cross sections from Hall A at JLab Need of higher twist and/or NLO contributions to fully describe the data (eg. in global GPD fits) First separation of DVCS 2 and BH-DVCS interference in the ep eγp cross section Approved program of experiments in Hall A and C to continue these high precision DVCS measurements at 12 GeV Carlos Muñoz Camacho (IPN-Orsay) New DVCS results from Hall A INT / 23
25 Back-up Carlos Muñoz Camacho (IPN-Orsay) New DVCS results from Hall A INT / 1
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