21th Epiphany Conference, Cracow, Poland, 2015/01/09 Csörgő, T. 1 Total, inelastic and elastic cross-sections of high energy pp, pA and eA collisions in.

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Presentation transcript:

21th Epiphany Conference, Cracow, Poland, 2015/01/09 Csörgő, T. 1 Total, inelastic and elastic cross-sections of high energy pp, pA and eA collisions in DIPSY G. Gustafson 1 L. Lönnblad 1, A. Ster 2 and T. Csörgő 2,3 1 University of Lund, Lund, Sweden 2 Wigner Research Center for Physics, Budapest, Hungary 2 Wigner Research Center for Physics, Budapest, Hungary 3 KRF, Gyöngyös, Hungary Introduction Introduction The Lund Dipole Cascade Model DIPSY New: nuclei in DIPSY Monte Carlo cross section results Comparison with Glauber results arXiv: arXiv: arXiv: arXiv: manuscript in preparation

21th Epiphany Conference, Cracow, Poland, 2015/01/09 Csörgő, T. 2 Introduction: Glauber theory++ Introduction: Glauber theory++ Glauber, 1955, 1967, 1970 Glauber and Matthiae, 1970 Bialas, Bleszynski, Czyz, 1976, … Analytically ~ impossible. Nuclear short range correlations? -> Monte-Carlo simulations Optical model, high energy physics Nuclear thickness function Overlap function Configuration space Nuclear geometry (uncorrelated) Elementary n-n interactions

21th Epiphany Conference, Cracow, Poland, 2015/01/09 Csörgő, T. 3 SR correlations, Gribov corrections SR correlations, Gribov corrections Short range nucleon-nucleon correlations (SRC) + Gribov diffractive corrections are important for nA and pA collisions → DIPSY detailed MC study for future accelerators <- Avioli et al, arXiv: Gribov: fluctuations in the size of n decrease total nA cross-sections

21th Epiphany Conference, Cracow, Poland, 2015/01/09 Csörgő, T. 4 DIPSY: Lund Dipole Cascade Model DIPSY: Lund Dipole Cascade Model Based on: Mueller’s dipole cascade Formulation of BFKL evolution in rapidity and trasverse coordinates 2 dipoles interact (in Born approx.) Multiple collisions: in eikonal approx.(unitarity OK) Forward amplitude and cross sections:

21th Epiphany Conference, Cracow, Poland, 2015/01/09 Csörgő, T. 5 DIPSY: a graphical summary DIPSY: a graphical summary Dipole chain (top) Chain split (bottom) Saturation (top) Swing: rearranged color flow (bottom)

21th Epiphany Conference, Cracow, Poland, 2015/01/09 Csörgő, T. 6 Treatement of nuclei in DIPSY Treatement of nuclei in DIPSY GLISSANDRO: (Broniowski et al) corrections for nuclear center Extended Woods-Saxon charge density Currently in DIPSY for He, O, Cu, Au and Pb R(Pb,NC) = 6.4 fm R(Au, NC) = 6.2 fm R(Cu,NC) = 4.2 fm R(O,NC) = 2.5 fm

21th Epiphany Conference, Cracow, Poland, 2015/01/09 Csörgő, T. 7 DIPSY test 1: pp cross sections DIPSY test 1: pp cross sections reproduces total and elastic pp cross-sections from ~ 200 GeV

21th Epiphany Conference, Cracow, Poland, 2015/01/09 Csörgő, T. 8 DIPSY test 2: pPb cross sections DIPSY test 2: pPb cross sections Inelastic cross-sections at 7 TeV DISPY and preliminary data from LHC

21th Epiphany Conference, Cracow, Poland, 2015/01/09 Csörgő, T. 9 DIPSY predictions: pA DIPSY predictions: pA

21th Epiphany Conference, Cracow, Poland, 2015/01/09 Csörgő, T. 10 DIPSY pA/pp ratios DIPSY pA/pp ratios pA total cross section does not scale with A (fluctuations, swing) DIPSY pA total asymptotically scales with A 2/3

21th Epiphany Conference, Cracow, Poland, 2015/01/09 Csörgő, T. 11 DIPSY for a future ep and eA collider DIPSY for a future ep and eA collider  * p DIPSY predictions  * A DIPSY predictions

21th Epiphany Conference, Cracow, Poland, 2015/01/09 Csörgő, T. 12 DIPSY predictions for eA collisions DIPSY predictions for eA collisions eO sigma(tot) approximately scales with A (fluctuations, swing) eAu sigma(tot) reduced as compared to eO: fluctuations, swing important

21th Epiphany Conference, Cracow, Poland, 2015/01/09 Csörgő, T. 13 Swing effects in DIPSY Swing effects in DIPSY

21th Epiphany Conference, Cracow, Poland, 2015/01/09 Csörgő, T. 14 DIPSY predictions vs Glauber MC DIPSY predictions vs Glauber MC DIPSY with dipole fluctuations and swing effects reduce pA cross sections by cca 5 – 15 %. Effect bigger for smaller A.

21th Epiphany Conference, Cracow, Poland, 2015/01/09 Csörgő, T. 15 What have we learned? pA cross sections reduce by 10% due to dipole fluctuations + swing Effect is larger in eA than in pA, decreases with increasing dipole size DIPSY Monte Carlo is available from Lund for future eA collider simulations

21th Epiphany Conference, Cracow, Poland, 2015/01/09 Csörgő, T. 16 Backup slides – Questions? Backup slides – Questions?

21th Epiphany Conference, Cracow, Poland, 2015/01/09 Csörgő, T. 17 Frame dependence? Frame dependence? DIPSY pp cross sections need to be tuned in each frame, after this step the cross section ratios are frame independent.