Handling of the generation of primary events in Gauss, the LHCb simulation framework

被引：411

作者：

Belyaev, I. ^{[1
,2
]}

Brambach, T. ^{[3
]}

Brook, N. H. ^{[4
]}

Gauvin, N. ^{[5
]}

Corti, G. ^{[6
]}

Harrison, K. ^{[7
]}

Harrison, P. F. ^{[8
]}

He, J. ^{[9
]}

Jones, C. R. ^{[10
]}

Lieng, M. ^{[7
]}

Manca, G. ^{[3
,11
,12
]}

Miglioranzi, S. ^{[6
]}

Robbe, P. ^{[6
]}

Vagnoni, V. ^{[6
,9
,13
]}

Whitehead, M.

Wishahi, J. ^{[8
]}

机构：

[1] Nikhef Natl Inst Subatom Phys, Amsterdam, Netherlands

[2] ITEP, Moscow, Russia

[3] Tech Univ Dortmund, Fak Phys, Dortmund, Germany

[4] Univ Bristol, HH Wills Phys Lab, Bristol, Avon, England

[5] Ecole Polytech Fed Lausanne, Lausanne, Switzerland

[6] European Org Nucl Res CERN, Geneva, Switzerland

[7] Univ Cambridge, Cavendish Lab, Cambridge, England

[8] Univ Warwick, Dept Phys, Coventry, W Midlands, England

[9] Univ Paris Sud, CNRS, IN2P3, LAL, Orsay, France

[10] Univ Coll Dublin, Sch Phys, Dublin, Ireland

[11] Sez INFN Cagliari, Cagliari, Italy

[12] Univ Cagliari, Cagliari, Italy

[13] Sez INFN Bologna, Bologna, Italy

来源：

INTERNATIONAL CONFERENCE ON COMPUTING IN HIGH ENERGY AND NUCLEAR PHYSICS (CHEP 2010): EVENT PROCESSING | 2011年 / 331卷

关键词：

D O I：

10.1088/1742-6596/331/3/032047

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

The LHCb simulation application, Gauss, consists of two independent phases, the generation of the primary event and the tracking of particles produced in the experimental setup. For the LHCb experimental program it is particularly important to model B meson decays: the EvtGen code developed in CLEO and BABAR has been chosen and customized for non-coherent B production as occuring in pp collisions at the LHC. The initial proton-proton collision is provided by a different generator engine, currently PYTHIA 6 for massive production of signal and generic pp collisions events. Beam gas events, background events originating from proton halo, cosmics and calibration events for different detectors can be generated in addition to pp collisions. Different generator packages as available in the physics community or specifically developed in LHCb are used for the different purposes. Running conditions affecting the generated events such as the size of the luminous region, the number of collisions occuring in a bunch crossing and the number of spill-over events from neighbouring bunches are modeled via dedicated algorithms appropriately configured. The design of the generator phase of Gauss will be described: a modular structure with well defined interfaces specific to the various tasks, e. g. pp collisions, particle decays, selections, etc. has been chosen. Different implementations are available for the various tasks allowing selecting and combining them as most appropriate at run time as in the case of PYTHIA 6 for pp collisions or HIJING for beam gas. The advantages of such structure, allowing for example to adopt transparently new generators packages, will be discussed.

引用

页数：6

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