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

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Inclusive diffraction off nuclei in the dipole picture. Cyrille Marquet. Theory Unit, CERN. Inclusive diffraction in DIS. Key features of data. diffractive over inclusive ratio. geometric scaling. C.M. and Schoeffel (2006). at fixed  , the scaling variable is. Recent data. - PowerPoint PPT Presentation

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Page 1: Inclusive diffraction off nuclei in the dipole picture

Inclusive diffraction off nuclei in the dipole picture

Cyrille Marquet

Theory Unit, CERN

Page 2: Inclusive diffraction off nuclei in the dipole picture

Inclusive diffraction in DIS

Page 3: Inclusive diffraction off nuclei in the dipole picture

Key features of datadiffractive over inclusive ratio

at fixed , the scaling variable is

C.M. and Schoeffel (2006)geometric scaling

Page 4: Inclusive diffraction off nuclei in the dipole picture

Recent data

Page 5: Inclusive diffraction off nuclei in the dipole picture

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)

Page 6: Inclusive diffraction off nuclei in the dipole picture

Nuclear diffractive structure functions

Kowalski, Lappi, C.M. and Venugopalan (2008)

Page 7: Inclusive diffraction off nuclei in the dipole picture

From protons to nuclei

averaged with the Woods-Saxon distribution

position of the nucleons

• the dipole-nucleus cross-section Kowalski and Teaney (2003)

in diffraction, averaging at the level of the amplitudecorresponds to a final state where the nucleus is intact

averaging at the cross-section levelallows the breakup of the nucleus into nucleons

• the Woods-Saxon averaging

Page 8: Inclusive diffraction off nuclei in the dipole picture

The ratio F2D,A / F2

D,p

quark-antiquark-gluon

quark-antiquark (T)

quark-antiquark (L)

> 1 and ~ const.

> 1 and decreases with β

< 1 and ~ const.

Auas a function of β :

• for each contribution

the quark-antiquark-gluon contribution dominates

• nuclear effects

enhancement at large

the quark-antiquark contribution dominates

the ratio is almost constant and decreases with A

suppression at small

Page 9: Inclusive diffraction off nuclei in the dipole picture

Diffraction and nuclear breakup

the quark-antiquark contributionsfor β values at which they dominate

• as a function of Q2

in this study the breakup of the nucleus into nucleons is allowed

• as a function of A

for a gold nucleus, the diffractive structure functionis 15 % bigger when allowing breakup into nucleons

the proportion of incoherent diffraction decreases with A


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