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Inclusive Diffraction in the Dipole Picture: Key Features and Nuclear Effects

Explore the theory of inclusive diffraction off nuclei in the dipole picture by Cyrille Marquet. Understand the contributions of different final states to the diffractive structure function, covering quark-antiquark-gluon at small β, quark-antiquark (T) at intermediate β, and quark-antiquark (L) at large β. Discover the nuclear diffractive structure functions and how the Woods-Saxon averaging affects diffraction at the amplitude and cross-section levels. Analyze the ratio F2D,A/F2D,p for various contributions in diffractive processes, and study the effects of nuclear breakup on diffraction at different β values and nuclear sizes. Unravel the dominance of quark-antiquark contributions and nuclear effects on diffractive structure functions.

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Inclusive Diffraction in the Dipole Picture: Key Features and Nuclear Effects

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  1. Inclusive diffraction off nuclei in the dipole picture Cyrille Marquet Theory Unit, CERN

  2. Inclusive diffraction in DIS

  3. Key features of data diffractive over inclusive ratio geometric scaling C.M. and Schoeffel (2006) at fixed , the scaling variable is

  4. Recent data

  5. Diffraction in the dipole picture contributions of the different final statesto the diffractive structure function: at small  : quark-antiquark-gluon at intermediate  : quark-antiquark (T) at large  : quark-antiquark (L)

  6. Nuclear diffractive structure functions Kowalski, Lappi, C.M. and Venugopalan (2008)

  7. From protons to nuclei • the dipole-nucleus cross-section Kowalski and Teaney (2003)  averaged with the Woods-Saxon distribution position of the nucleons • the Woods-Saxon averaging in diffraction, averaging at the level of the amplitude corresponds to a final state where the nucleus is intact averaging at the cross-section level allows the breakup of the nucleus into nucleons

  8. The ratio F2D,A / F2 D,p • for each contribution Au as a function of β: quark-antiquark-gluon < 1 and ~ const. quark-antiquark (T) > 1 and ~ const. quark-antiquark (L) > 1 and decreases with β • nuclear effects enhancement at large the quark-antiquark contribution dominates the ratio is almost constant and decreases with A suppression at small the quark-antiquark-gluon contribution dominates

  9. Diffraction and nuclear breakup in this study the breakup of the nucleus into nucleons is allowed • as a function of Q2 the quark-antiquark contributions for β values at which they dominate • as a function of A for a gold nucleus, the diffractive structure function is 15 % bigger when allowing breakup into nucleons the proportion of incoherent diffraction decreases with A

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