Nuclear attenuation 2 dimensional dependences at HERMES
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1 Nuclear attenuation dimensional dependences at HERMES Inti Lemann University of Glasgow for te HERMES Collaboration DIS, Florence, /4/
2 Experimental Metod Semi-Inclusive DIS (SIDIS) on te Nucleon Access parton fragmentation functions dσ = q dσ f D f Inti Lemann Nucl. Atten. - D, /4/ Florence
3 Experimental Metod Semi-Inclusive DIS (SIDIS) on te Nucleon Access parton fragmentation functions dσ = q dσ f D f ν = E e E e Q = q P P k k q " #! z = E ν Inti Lemann Nucl. Atten. - D, /4/ Florence 3
4 Experimental Metod Semi-Inclusive DIS (SIDIS) on te Nucleon Access parton fragmentation functions dσ = q dσ f D f ν = E e E e Q = q P P k k q " #! Experimentally well studied on te nucleon Probabilistic interpretation z = E ν Inti Lemann Nucl. Atten. - D, /4/ Florence 4
5 Measurements on te Nucleus Initial reaction identical to nucleon DIS Final state influenced by nuclear matter electron adrons Compare several nuclei Information on FSI nucleus Inti Lemann Nucl. Atten. - D, /4/ Florence 5
6 Hadronisation in Matter Evolution in space and time Parton propagation Gluon radiation Partonic rescattering lengt < l c parton pre-adron Pre-adron propagation Quantum numbers of Colourless but off sell adron Hadron formation lc Formation lengt l f uo fm (outside N) lf Inti Lemann Nucl. Atten. - D, /4/ Florence 6
7 Experimental Observable Hadron multiplicity ratio comparing nucleus A wit deuterium D ( N (ν,q,z,p t ) ) R A(ν,Q,z,p t )= N e (ν,q ) ( N (ν,q,z,p t ) N e (ν,q ) Exp. systematics cancel largely Partonic and adronic effects contribute ) A D, Inti Lemann Nucl. Atten. - D, /4/ Florence 7
8 HERMES at HERA, DESY Long. polarized electron/positron beams 7.6 GeV Inti Lemann Nucl. Atten. - D, /4/ Florence 8
9 HERMES Spectrometer Y [m] SPECTROMETER Drift Cambers Hodoscope Presower e + /e - D, He,,, Xe Drift Cambers 7.6 GeV Target Cell - Hodoscope Luminosity Monitor - Prop. Cambers RICH TRD Calorimeter Magnet Magnetic spectrometer wit transv. and long. polarized targets Z [m] Inti Lemann Nucl. Atten. - D, /4/ Florence 9
10 First Publication p t,tesquareofteadronmomentumcomp of te virtual poton. Tus RA can be writt " (GeV) He Xe! +.5 Nucl. Pys. B78 (7)-7 z Multiplicity ratio R A(ν,Q,z,p t )= D dependence A dependence compatible wit A /3 ( N ( N ( N ( N wit N (ν,q,z,p t )tenumberofsemi-inclu and N e (ν,q )tenumberofinclusivedisle definition is te integration over te angle K + plane and te adron production plane (see Experiments at large values of ν [,3] give va imental uncertainty. p Tis is interpreted as a are negligible in tat region. At lower value Q (GeV ) found to be well below unity [,4,5]. Even toug adronization is not yet quantit Inti Lemann Nucl. Atten. - D, /4/ Florence
11 w Results - D Analysis P. < z <.4.4 < z <.7 z >.7 HERMES Xe PRELIMINARY dσ = q dσ f D f dσ = q dσ f D f ν = E e E e Q = q z = E 3.6% Scale unc.! + 5.4% Scale unc. K + 4.5% Scale unc. p D dependences extracted variables: ν = E ν e p t E e over distributions ν avoids integration ν = E e E e Q = q z = E = Σ + L q + G + L disentangles dependence ν dependence in z slices dσ = q dσ dσ = q dσ f D f substructures observed π + and K + similar protons pronounced differences for different z Q = q ν = E e E e Q = q z = " [GeV] Inti Lemann Nucl. Atten. - D, /4/ Florence
12 w Results - D Analysis. P HERMES Xe PRELIMINARY. HERMES Xe PRELIMINARY < z <.4.4 < z <.7 z >.7 3.6% Scale unc.! < z <.4.4 < z <.7 z >.7 3.% Scale unc.! % Scale unc. K % Scale unc. K % Scale unc. p.75.5.% Scale unc. - p " [GeV] π + and π - similar wile K - differ " [GeV] Inti Lemann Nucl. Atten. - D, /4/ Florence
13 w Results - D Analysis dep. in z slices Nuclear broadening Cronin effect Less tan predicted in Nucl.Pys.A74 (4) Disappears for ig z Compatible for negative adrons < z <.4.4 < z <.7 z >.7 HERMES.. Xe PRELIMINARY 3.6% Scale unc.! + 5.4% Scale unc. K + 4.5% Scale unc.. [GeV ] p Inti Lemann Nucl. Atten. - D, /4/ Florence 3
14 w Results - D Analysis z dep. in slices z-dependence increases wit dependence disappears at ig z <.4 GeV.4 < <.7 GeV >.7 GeV HERMES PRELIMINARY Xe 3.6% Scale unc.! + 5.4% Scale unc. K % Scale unc..5.5 p.5 z Inti Lemann Nucl. Atten. - D, /4/ Florence 4
15 Summary Semi-Inclusive Deep Inelastic Scattering (SIDIS) Nucleon: well studied Nucleus: parton propagation + adronisation HERMES Results Strong nuclear effects on multiplicity ratio D correlations (unexpected) Only few igligted ere Positive and negative kaons differ Particular features for protons Nuclear broadening z dependent Paper in preparation All dependencies will be publised Inti Lemann Nucl. Atten. - D, /4/ Florence 5
16 Backup pt in z slices (neg. adrons).5.. < z <.4.4 < z <.7 z >.7 Xe HERMES PRELIMINARY.5 3.% Scale unc.! % Scale unc. K % Scale unc... Inti Lemann Nucl. Atten. - D, /4/ Florence 6. [GeV ] - p
17 Backup z in pt slices (neg. adrons) <.4 GeV.4 < <.7 GeV >.7 GeV HERMES PRELIMINARY Xe 3.% Scale unc.! % Scale unc. K % Scale unc..5.5 Inti Lemann Nucl. Atten. - D, /4/ Florence 7.5 z - p
18 Backup Q in pt slices. HERMES PRELIMINARY Xe. HERMES PRELIMINARY Xe.8.5 <.4 GeV.4 < <.7 GeV >.7 GeV 3.6% Scale unc.! <.4 GeV.4 < <.7 GeV >.7 GeV 3.% Scale unc.! % Scale unc. K % Scale unc. K % Scale unc. p Q [GeV ] Inti Lemann Nucl. Atten. - D, /4/ Florence 8..5.% Scale unc. - p Q [GeV ]
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