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Information × Registration Number 0212U006526, 0110U003397 , R & D reports Title Development and support of JINR LIT and NSC KIPT Grid infrastructures for distributed CERN-CMS experimental data analysis during first years of the Large Hadron Collider operation. popup.stage_title Head Levchuk Leonid Guennadievich, Кандидат фізико-математичних наук Registration Date 26-04-2012 Organization National Science Center "Kharkiv Institute of Physics and Technology popup.description2 Within the 2 first years of work of the Large Hadron Collider (LHC) is confirmed the status of the computer system (CS) of NSC KIPT as one of the stable and reliable T2-centers of grid-infrastructure of experiment of CMS. It is extracted at limited computing and disk resources of a complex and insufficiently wide channel of its external communication in the conditions of quickly growing flow of experimental information. Result began to associate the decision of the management of grid-infrastructure of CMS the T2_UA_KIPT with one of research divisions experiment to experiment (group of the analysis given "Electroweak") and to arrange on CS NSC KIPT a part of data from the LHC for their further analysis participants of experiment of CMS. It allowed, since the middle of 2010, to consider to the T2_UA_KIPT center robot as the main component of implementation of obligations of Ukraine from service of experiment of CMS. Without stopping a complex its modernization with approach of hardware parameters to requirements of grid-infrastructure of CMS was carried out. According to growing requirements of CMS to quality of data exchange there were successfully continued works on certification of communication channels of the T2_UA_KIPT center with other centers of grid-infrastructure of experiment. Rerouting of long-distance external communication of the T2_UA_KIPT complex allowed successful to finish certification of all the 8th channels of receipt of information on CS NSC KIPT from T1-center CMS. Necessary channels of data exchange between T2_UA_KIPT and other CMS T2-centers were also certificated. Besides, certification of additional "return" data links from T2_UA_KIPT on T1-sayts of experiment is successfully executed. Experience of processing of experimental information from the LHC which collects in experiment of CMS is gained and is distributed on its grid-infrastructure. For the very first samples of the data received in December, 2009 at energy of proton collisions of 900 GEV, events with formation of K0S-мезонов are allocated. The constructed distributions of the birth of the charged peonies on a cross-section impulse and pseudo-speed are in a satisfactory consent with the calculations executed by the Monte-Carlo method on a basis a quark - proton model (PYTHIA generator). Also complete sample of the data received for all 2010, from which allocated and analysed events with the birth of single Z0-bosons and their disintegrations on muonic pairs is processed. For the analysis of data, and also for computer modeling the program CMSSW complex which provides, on the one hand, reconstruction of events, and with another - effective methods of access to information on the renewed objects (electrons, muons, hadron streams, other) was used. Calculations were carried out remotely, in structures LHC-grid (WLCG), using a CRAB package developed in experiment of CMS for a universalization of procedure of the appeal to data and simplification of access to the computing WLCG resources. Product Description popup.authors Бунецький Олег Олегович Горбенко Євген Степанович Зуб Станіслав Сергійович Косінов Валерій Іванович Левчук Леонід Геннадійович Лук'яненко Сергій Тимофійович Попов Віктор Пилипович Приставка Олександр Сергійович Сорокін Павло Володимирович Сорока Дмитро В'ячеславович Тижненко Микола Олександрович popup.nrat_date 2020-04-02 Close