Simulating photonuclear interactions with MMC

Dmitry Chirkin

UC Berkeley

The ModelsQ2

1 GeV2soft hard

photoproduction DIS

GVDM CKMT ALLM

Bezrukov-Bugaev Butkevich-Mikheyev Abramowicz Levin Levy Maor

1991 19972002BB 1981

BB + Hard 03Bugaev Shlepin

ZEUS 94

Kokoulin 99

Nuclear effects

Dutta Smirnov

All photonuclear cross sections

• As generated by MMC

Standard rockWater

Sources

• ALLM: Dutta, Seckel, et al. 2000

• BB, ZEUS, BB+BS, ALLM: Sokalski et al. 2002

• BM, BB: Butkevich, Mikheyev 2002

• BB, BB+BS, ALLM for taus: Bugaev et al. 2003

• BB, BB+BS for taus: Bugaev, Shlepin 2003

ALLM

• Photon-nucleon cross section

from Dutta Seckel

ALLM

• Muon photonuclear cross section from Dutta Seckel

from Dutta Seckel

Bezrukov-Bugaev

• Comparison of BB1981 and ZEUS95 parameterizations

from Sokalski

BB+Bugaev-Shlepin

Comparison with BB1981, ALLM, and Butkevich-Mikheyev

from Sokalski

from Bugaev Shlepin

Butkevich-Mikheyev

• BM, BB

from Butkevich Mikheyev

from Sokalski

BB+Bugaev-Shlepin (taus)

• BB+BS, ALLM: tau propagation

from Bugaev

from Bugaev Shlepin

Conclusions

• Plots of photonuclear cross section change from one publication to another, some of this can be explained by use of different shadowing functions.

• ALLM 97 parameterization is currently used in AMANDA. Its results are very similar to Butkevich-Mikheyev parameterization.

• Switching to the newer nuclear structure function as described in B-M will bring the ALLM 97 model closer to the new BB+BS parameterization.