Standard Model; Search for the Higgs Boson; Particle Production; LHC Large Hadron Collider; CMS Detector; Electromagnetic Calorimeter; Muon Detectors; Alignment
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The Institute for Particle Physics (IPP) of ETH Zurich is one of the leading Institutes participating in the Compact Muon Solenoid (CMS) experiment at CERN’s Large Hadron Collider (LHC). CMS is presently in the commissioning phase in view of the planned LHC re-start in autumn 2009. The design concept of the CMS experiment guarantees full exploitation of the physics potential of-fered by the LHC, which will provide proton-proton collisions at unprecedented centre-of-mass energies of 10 - 14 TeV. CMS has thus a unique prospective for important discoveries in Ele-mentary Particle Physics for the next decade. Two of the most distinctive and important detector systems of the CMS experiment are the high precision Electromagnetic Calorimeter (ECAL), consisting of about 76000 Lead-Tungstate crys-tals, and the muon spectrometer. These systems are crucial for a large spectrum of measure-ments and their good performance is essential for the success of the CMS experiment. From the very beginning the IPP had major responsibility of scientific, technical and managerial nature for this ECAL sub-detector. In particular, we carry the project leadership for the development, construc-tion and operation of the Detector Control System (DCS) of ECAL. This project is realized in col-laboration with scientists from the VINCA Institute and the Faculty of Physics of the University of Belgrade (Serbia). Similarly, Hungarian Institutes from Budapest and Debrecen have taken im-portant responsibilities for the alignment system of the muon spectrometer.This proposal for a Joint Research Project (JRP) is intended to strengthen the already existing and very successful collaboration with our colleagues from Serbia, which manifested itself also in the successful execution of a previous SCOPES JRP, Project Number IB7320-111135. At the same time, we would like to extend this JRP to our colleagues from the Hungarian institutes and thus form a strong and competitive cluster of institutes within the large CMS collaboration. This cluster would build on a large expertise on various important aspects of the CMS experiment and have a competitive role in the upcoming data analyses.The requested funds are intended to allow the Eastern European partners to spend a consider-able amount of time at CERN, both to participate in the operation and maintenance of the detec-tor components mentioned above and to actively take part in the physics and analysis discussions of the collaboration. For smaller Institutes such as those from Serbia and Hungary it is difficult to gain visibility in a very large collaboration like CMS (close to 3000 scientists from about 180 Institutes). Therefore it is important for them to have a strong presence at CERN and a close collaboration with larger Institutes such as the IPP of ETH Zurich.The proposed research topics concern (i) the operation and maintenance of the ECAL safety sys-tem, which is part of the ECAL DCS, and the muon alignment system; and (ii) the participation in first CMS data analyses. Regarding the latter, the plan is to concentrate on measurements of charged particle distributions, which are probably the very first analyses and publications of the CMS experiment, as well as on lepton and photon reconstruction and studies of neutral pion background rejection. The latter is relevant for the low-mass Higgs search and for searches of anomalous Triple Gauge Boson couplings. The period of this JRP (October 2009 to September 2012) fits extremely well with the current LHC and CMS schedules.The objectives and expected results of the proposed JRP can thus be summarized as follows:- Allow for prolonged stays of members from the Serbian and Hungarian research teams at CERN in order to carry out the following research activities:•Operation and maintenance of the CMS ECAL safety system and the muon alignment system•Participation in the final commissioning of the CMS detector and the start-up physics run•Setting up and participation in physics analyses of LHC data, which concentrate on the exploitation of the excellent capabilities of the CMS sub-detectors. •Support of the data analysis activities in terms of theoretical contributions, most notably in the jet production sector of strong interactions. - These activities should result in•Highly efficient and safe operation of the CMS ECAL and precise muon track reconstruc-tion thanks to an optimally aligned muon system•An in-depth understanding of the first CMS data•First Physics results from the analyses of the data collected during the initial years of LHC running, at the centre-of-mass energies of 10 and 14 TeV.Based on the positive experience from the past SCOPES JRP, we are convinced that the strong and visible participation of the Eastern European partners in a fore-front international research project such as the CMS experiment will allow them to (a) further strengthen their scientific capabilities, (b) improve the efficiency of their work and participation within large international collaborations, (c) enhance their national as well as international reputation and thus (d) to at-tract students, funding agencies and industries in their home countries, with evident long-term benefits.