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1 Deep Inelastic Scattering On Nuclear Targets at Beni Zihlmann NIKHEF NIKHEF Jaarvergadering p./4
2 Deep Inelastic Scattering Electron Scattering on H, H, 3 He, 4 N, Ne, 84 Kr NIKHEF Jaarvergadering p./4
3 Deep Inelastic Scattering Electron Scattering on H, H, 3 He, 4 N, Ne, 84 Kr Inclusive Scattering e(e,)x Nucleon structure in Nucleus Nuclear Dependence R A = R D? NIKHEF Jaarvergadering p./4
4 Deep Inelastic Scattering Electron Scattering on H, H, 3 He, 4 N, Ne, 84 Kr Inclusive Scattering e(e,)x Nucleon structure in Nucleus Nuclear Dependence R A = R D? Semi Inclusive Scattering e(e,h)x Nuclear Attenuation Hadron formation time and energy loss Heavy Ion collisions NIKHEF Jaarvergadering p./4
5 Deep Inelastic Scattering Electron Scattering on H, H, 3 He, 4 N, Ne, 84 Kr Inclusive Scattering e(e,)x Nucleon structure in Nucleus Nuclear Dependence R A = R D? Semi Inclusive Scattering e(e,h)x Nuclear Attenuation Hadron formation time and energy loss Heavy Ion collisions Exclusive Scattering e(e,h)r Coherent, Incoherent ρ production positive slope in Transparency NIKHEF Jaarvergadering p./4
6 Inclusive Scattering Cross Section Ratio on the Born level lepton k k θ γ* q=k-k nucleon p p x NIKHEF Jaarvergadering p.3/4
7 Inclusive Scattering lepton Cross Section Ratio on the Born level k k θ γ* q=k-k Q = q = (k k ) x = q P q = Q Mν y = P q P e = E E E = ν E nucleon p p x NIKHEF Jaarvergadering p.3/4
8 Inclusive Scattering lepton Cross Section Ratio on the Born level k nucleon k θ γ* p q=k-k p x Q = q = (k k ) x = q P q = Q Mν y = P q P e = E E E W = (p + q) = ν E > 4 GeV (DIS) NIKHEF Jaarvergadering p.3/4
9 Inclusive Scattering lepton Cross Section Ratio on the Born level k nucleon k θ γ* p q=k-k p x Q = q = (k k ) x = q P q = Q Mν y = P q P e = E E E W = (p + q) = ν E > 4 GeV (DIS) σ A Born σ D Born = F A F D ( + ɛr A )( + R D ) ( + R A )( + ɛr D ) NIKHEF Jaarvergadering p.3/4
10 Inclusive HERMES Results σ A /σ D HERMES, 84 Kr SLAC, 56 Fe NMC, 9 Sn HERMES, 4 N SLAC, C NMC, C Cross section ratio σ Kr σ D, σ N σd and σ He σ D HERMES data agree within errors with NMC HERMES, 3 He SLAC, 4 He NMC, 4 He - - x NIKHEF Jaarvergadering p.4/4
11 Inclusive HERMES Results σ A /σ D HERMES, 84 Kr SLAC, 56 Fe NMC, 9 Sn HERMES, 4 N SLAC, C NMC, C Cross section ratio σ Kr σ D, σ N σd and σ He σ D HERMES data agree within errors with NMC extend to low Q HERMES, 3 He SLAC, 4 He NMC, 4 He - - x NIKHEF Jaarvergadering p.4/4
12 Inclusive HERMES Results σ A /σ D HERMES, 84 Kr SLAC, 56 Fe NMC, 9 Sn HERMES, 4 N SLAC, C NMC, C Cross section ratio σ Kr σ D, σ N σd and σ He σ D HERMES data agree within errors with NMC extend to low Q extract R A /R D HERMES, 3 He SLAC, 4 He NMC, 4 He - - x NIKHEF Jaarvergadering p.4/4
13 Fit cross section ratio R(ɛ) for fixed x Extraction of R A /R D σ N /σ D. <x> =.5 <x> =.75 <x> =.5. <x> =.35 <x> =.45 <x> =.55.. <x> =.7 <x> =.9 <x> =.5 <x> =.75 <x> =.5 <x> = ε parameter Fit: F A F D solid line, R A R D NIKHEF Jaarvergadering p.5/4
14 Fit cross section ratio R(ɛ) for fixed x Extraction of R A /R D σ N /σ D. <x> =.5 <x> =.75 <x> =.5. <x> =.35 <x> =.45 <x> =.55.. <x> =.7 <x> =.9 <x> =.5 <x> =.75 <x> =.5 <x> = ε parameter Fit: F A F D solid line, R A R D Parameterization of R D for each x bin agrees with NMC F A F D NIKHEF Jaarvergadering p.5/4
15 Fit cross section ratio R(ɛ) for fixed x Extraction of R A /R D σ N /σ D. <x> =.5 <x> =.75 <x> =.5. <x> =.35 <x> =.45 <x> =.55.. <x> =.7 <x> =.9 <x> =.5 <x> =.75 <x> =.5 <x> = ε parameter Fit: F A F D solid line, R A R D Parameterization of R D for each x bin agrees with NMC F A F D parameter Fit: fix F A F D dashed line R A R D for each x bin NIKHEF Jaarvergadering p.5/4
16 New HERMES Results for R A /R D R A /R D < x <.3 HERMES(Kr/D) HERMES(N/D) HERMES( 3 He/D) NMC(C/D) NMC( 4 He/D) NMC(Sn/D) NMC(Ca/D) SLAC(Ca/D).3 < x <.6.6 < x <.5.5 < x < Q (GeV ) HERMES finds R A consistent with R D NIKHEF Jaarvergadering p.6/4
17 New HERMES Results for R A /R D R A /R D < x <.3 HERMES(Kr/D) HERMES(N/D) HERMES( 3 He/D) NMC(C/D) NMC( 4 He/D) NMC(Sn/D) NMC(Ca/D) SLAC(Ca/D) The Future holds.3 < x <.6.6 < x <.5.5 < x < Q (GeV ) HERMES finds R A consistent with R D NIKHEF Jaarvergadering p.6/4
18 New HERMES Results for R A /R D R A /R D < x <.3 HERMES(Kr/D) HERMES(N/D) HERMES( 3 He/D) NMC(C/D) NMC( 4 He/D) NMC(Sn/D) NMC(Ca/D) SLAC(Ca/D) The Future holds σ D σ H at 7 GeV (Jan Visser).3 < x <.6.6 < x <.5.5 < x < Q (GeV ) HERMES finds R A consistent with R D NIKHEF Jaarvergadering p.6/4
19 New HERMES Results for R A /R D R A /R D < x <.3.3 < x <.6.6 < x <.5 HERMES(Kr/D) HERMES(N/D) HERMES( 3 He/D) NMC(C/D) NMC( 4 He/D) NMC(Sn/D) NMC(Ca/D) SLAC(Ca/D) The Future holds σ D σ H at 7 GeV (Jan Visser) Data on Kr, N, H, H at GeV extend to lower Q.5 < x < Q (GeV ) HERMES finds R A consistent with R D NIKHEF Jaarvergadering p.6/4
20 New HERMES Results for R A /R D R A /R D < x <.3.3 < x <.6.6 < x <.5 HERMES(Kr/D) HERMES(N/D) HERMES( 3 He/D) NMC(C/D) NMC( 4 He/D) NMC(Sn/D) NMC(Ca/D) SLAC(Ca/D) The Future holds σ D σ H at 7 GeV (Jan Visser) Data on Kr, N, H, H at GeV extend to lower Q.5 < x < Q (GeV ) HERMES finds R A E99-8(Vladas Tvaskis) direct measurement of R A consistent with R D NIKHEF Jaarvergadering p.6/4
21 Semi Inclusive DIS l lepton k k θ γ* q=k-k h nucleon p p x NIKHEF Jaarvergadering p.7/4
22 Semi Inclusive DIS l Q = q = (k k ) lepton k k θ q=k-k γ* h x = q P q = Q Mν y = P q P e = E E E = ν E nucleon p p x NIKHEF Jaarvergadering p.7/4
23 Semi Inclusive DIS l Q = q = (k k ) lepton k k θ q=k-k γ* h x = q P q = Q Mν y = P q P e = E E E ν = E E = ν E nucleon p p x z = E h ν NIKHEF Jaarvergadering p.7/4
24 Semi Inclusive DIS l Q = q = (k k ) lepton k k θ q=k-k γ* h x = q P q = Q Mν y = P q P e = E E E ν = E E = ν E nucleon p p x z = E h ν R h att(ν, z) = d σ SIDIS σ DIS (ν) dνdz A σ DIS (ν) d σ SIDIS dνdz D RICH identify π ± K ± p ± NIKHEF Jaarvergadering p.7/4
25 Attenuation Ratios multiplicity ratio for 84 Kr / D z ν [GeV] Q [GeV ] multiplicity ratio for 84 Kr / D ν [GeV] z Q [GeV ] NIKHEF Jaarvergadering p.8/4
26 Attenuation Ratios multiplicity ratio for 84 Kr / D z ν [GeV] π + and π consistent Q [GeV ] multiplicity ratio for 84 Kr / D ν [GeV] z Q [GeV ] NIKHEF Jaarvergadering p.8/4
27 Attenuation Ratios multiplicity ratio for 84 Kr / D z ν [GeV] π + and π consistent Q [GeV ] multiplicity ratio for 84 Kr / D ν [GeV] z Q [GeV ] K + larger than K NIKHEF Jaarvergadering p.8/4
28 Attenuation Ratios multiplicity ratio for 84 Kr / D z ν [GeV] π + and π consistent K + larger than K Q [GeV ] multiplicity ratio for 84 Kr / D ν [GeV] p + very different p p + > at low z z Q [GeV ] NIKHEF Jaarvergadering p.8/4
29 Models of Attenuation Hadron Formation Time t Nuclear Absorption formed hadron scatters in nuclear medium A /3 τ f NIKHEF Jaarvergadering p.9/4
30 Models of Attenuation Hadron Formation Time t Nuclear Absorption formed hadron scatters in nuclear medium A /3 Gluon Bremsstrahlung (QCD) multiple parton scattering A /3 τ f NIKHEF Jaarvergadering p.9/4
31 Models of Attenuation Hadron Formation Time t Nuclear Absorption formed hadron scatters in nuclear medium A /3 Gluon Bremsstrahlung (QCD) multiple parton scattering A /3 Combined analysis of Nitrogen and Krypton data Thesis Erika Garutti τ f NIKHEF Jaarvergadering p.9/4
32 Models of Attenuation Hadron Formation Time t Nuclear Absorption formed hadron scatters in nuclear medium A /3 Gluon Bremsstrahlung (QCD) multiple parton scattering A /3 Combined analysis of Nitrogen and Krypton data Thesis Erika Garutti τ f NIKHEF Jaarvergadering p.9/4
33 SIDIS at HERMES Prospects Results on Helium and Neon at 7.5 GeV beam energy NIKHEF Jaarvergadering p./4
34 SIDIS at HERMES Prospects Results on Helium and Neon at 7.5 GeV beam energy Analysis on GeV data (low ν range) Paul van der Nat NIKHEF Jaarvergadering p./4
35 SIDIS at HERMES Prospects Results on Helium and Neon at 7.5 GeV beam energy Analysis on GeV data (low ν range) Paul van der Nat New Data on heavier targets explore A dependence NIKHEF Jaarvergadering p./4
36 Exclusive ρ production lcoh rho N N NIKHEF Jaarvergadering p./4
37 Exclusive ρ production lcoh rho N N Hadronic Structure of virtual photon size of virtual q q-pair NIKHEF Jaarvergadering p./4
38 Exclusive ρ production lcoh rho N N Hadronic Structure of virtual photon size of virtual q q-pair VM interaction in nuclear medium Nuclear transparency NIKHEF Jaarvergadering p./4
39 Exclusive ρ production lcoh rho N N Hadronic Structure of virtual photon size of virtual q q-pair VM interaction in nuclear medium Nuclear transparency Coherence length l c = ν Q +M q q NIKHEF Jaarvergadering p./4
40 Coherent and Incoherent Scattering Transparency Ratios dσ dt e bt NIKHEF Jaarvergadering p./4
41 Coherent and Incoherent Scattering Transparency Ratios dσ dt e bt T coh = σ A coh /Aσp NIKHEF Jaarvergadering p./4
42 Coherent and Incoherent Scattering Transparency Ratios dσ dt e bt T coh = σ A coh /Aσp T incoh = σ A incoh /Aσp NIKHEF Jaarvergadering p./4
43 Coherent and Incoherent Scattering Transparency Ratios dσ dt e bt T coh = σ A coh /Aσp T incoh = σ A incoh /Aσp R = σ A coh /σa incoh NIKHEF Jaarvergadering p./4
44 Coherent and Incoherent Scattering Transparency Ratios dσ dt e bt T coh = σ A coh /Aσp T incoh = σ A incoh /Aσp R = σ A coh /σa incoh T (l c, Q ) and R(l c, Q ) Need to fix l c NIKHEF Jaarvergadering p./4
45 Q [GeV] Coherence length effects 4 4 lcoh [fm] NIKHEF Jaarvergadering p.3/4
46 lcoh =.35 fm lcoh =.45 fm lcoh =.55 fm lcoh =.65 fm lcoh =.75 fm lcoh =.85 fm lcoh =.95 fm lcoh =.5 fm lcoh =.5 fm lcoh =.5 fm lcoh =.35 fm lcoh =.45 fm (lcoh,q ) / A σ p Q [GeV] Coherence length effects N σ coh lcoh [fm] Q [GeV ] NIKHEF Jaarvergadering p.3/4
47 lcoh =.35 fm lcoh =.45 fm lcoh =.55 fm lcoh =.65 fm lcoh =.75 fm lcoh =.85 fm lcoh =.95 fm lcoh =.5 fm lcoh =.5 fm lcoh =.5 fm lcoh =.35 fm lcoh =.45 fm (lcoh,q ) / A σ p Q [GeV] Coherence length effects N σ coh lcoh [fm] 4 4 Q [GeV ] Fit T (Q ) at fixed lc with one slope parameter bcoh =.7 ±.4 bincoh =.89 ±.47 combined: b =.74 ±. positive slope! NIKHEF Jaarvergadering p.3/4
48 Conclusions Extend world data in Q (<GeV ) NIKHEF Jaarvergadering p.4/4
49 Conclusions Extend world data in Q (<GeV ) R A consistent with R D NIKHEF Jaarvergadering p.4/4
50 Conclusions Extend world data in Q (<GeV ) R A consistent with R D Flavor dependence of hadron attenuation NIKHEF Jaarvergadering p.4/4
51 Conclusions Extend world data in Q (<GeV ) R A consistent with R D Flavor dependence of hadron attenuation Formation time of mesons and baryons NIKHEF Jaarvergadering p.4/4
52 Conclusions Extend world data in Q (<GeV ) R A consistent with R D Flavor dependence of hadron attenuation Formation time of mesons and baryons Nuclear Transparency and T (l c, Q ) NIKHEF Jaarvergadering p.4/4
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