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LHC detectors : commissioning and early physics
/ Buchmüller, O L (CERN)
After a machine-commissioning phase in summer 2008, the Large Hadron Collider (LHC), 27 km long, at CERN (Geneva/Switzerland) will begin colliding protons at a center-of-mass energy of 14 TeV, becoming the world's highest energy particle collider. The main goals of the LHC are the search for the Higgs boson, the last particle remaining undiscovered of the standard model of particle physics, and the search for physics 'beyond the standard model'. [...]
2008
- Published in : J. Phys.: Conf. Ser. 110 (2008) 012015
In : International Europhysics Conference on High Energy Physics, Manchester, UK, 19 - 25 Jul 2007, pp.012015
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2.
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3.
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Predictions for Supersymmetric Particle Masses using Indirect Experimental and Cosmological Constraints
/ Buchmüller, O L (CERN) ; Cavanaugh, R (Fermilab, Batavia, IL, USA ; Univ. Illinois, Chicago, IL, USA) ; de Roeck, A (CERN ; Antwerp Univ., Wilrijk, Belgium) ; Ellis, Jonathan Richard (CERN) ; Flächer, H (CERN) ; Heinemeyer, S (Inst. Física de Cantabria (CSIC-UC), Santander, Spain) ; Isidori, G (INFN, LNF, Frascati, Italy ; Scuola Norm. Sup., Pisa, Italy) ; Olive, K A (School Phys. Astron., Univ. Minnesota, Minneapolis, MN, USA) ; Paradisi, P (Tech. Univ. München, Garching, Germany) ; Ronga, F J (ETH Zürich, Switzerland) et al.
In view of the imminent start of the LHC experimental programme, we use the available indirect experimental and cosmological information to estimate the likely range of parameters of the constrained minimal supersymmetric extension of the Standard Model (CMSSM), using a Markov-chain Monte Carlo (MCMC) technique to sample the parameter space. The 95% confidence-level area in the (m_0, m_1/2) plane of the CMSSM lies largely within the region that could be explored with 1/fb of integrated luminosity at 14 TeV, and much of the 68% confidence-level area lies within the region that could be explored with 50/pb of integrated luminosity at 10 TeV. [...]
arXiv:0808.4128; CERN-PH-TH-2008-181.-
Geneva : CERN, 2008 - 19 p.
- Published in : JHEP 09 (2008) 117
SISSA/IOP Open Access article: PDF; External link: Fulltext
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4.
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The CMS tracker operation and performance at the Magnet Test and Cosmic Challenge
/ Adam, W ; Bergauer, T ; Dragicevic, M ; Friedl, M ; Frühwirth, R ; Hänsel, S ; Hrubec, Josef ; Krammer, M ; Pernicka, M ; Waltenberger, W et al.
During summer 2006 a fraction of the CMS silicon strip tracker was operated in a comprehensive slice test called the Magnet Test and Cosmic Challenge (MTCC). At the MTCC, cosmic rays detected in the muon chambers were used to trigger the readout of all CMS sub-detectors in the general data acquisition system and in the presence of the 4 T magnetic field produced by the CMS superconducting solenoid. [...]
2008
- Published in : JINST 3 (2008) P07006
SISSA/IOP Open Access article: jinst8_07_p07006_1 - PDF; jinst8_07_p07006 - PDF;
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5.
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Introduction to the CMS contribution
/ Arce, P (CIEMAT, Madrid, Spain) ; Buchmüller, O L (CERN) ; Schilling, F P (CIEMAT, Madrid, Spain) ; Vila, I (Insituto de Fisica de Cantabria (CSIC-UC), Santander, Spain) ; Weber, M (I. Physikalisches Institut B, Aachen, Germany)
/CMS Collaboration
CERN, 2007 - 2 p.
Published version from CERN: PDF;
In : 1st LHC Detector Alignment Workshop, CERN, Geneva, Switzerland, 4 - 6 Sep 2006, pp.173-174 (CERN-2007-004)
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6.
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Impact of CMS Silicon Tracker Misalignment on Track and Vertex Reconstruction
/ De Filippis, N (Bari U. ; Bari Polytechnic ; INFN, Bari) ; Barbone, L (Bari U. ; Bari Polytechnic ; INFN, Bari) ; Buchmüller, O L (CERN) ; Schilling, F P (CERN) ; Speer, T (Zurich U.) ; Vanlaer, P (Brussels U., IIHE)
/CMS Collaboration
The alignment uncertainties of the CMS Tracker detector, made of a huge amount of independent silicon sensors with an excellent position resolution, affect the performances of the track reconstruction, the track parameters measurement and the vertex reconstruction. In order to study the impact of the mis-alignment of the CMS tracking devices on the previous procedures, realistic estimates for the expected displacements of the tracking systems are supplied in two different scenarios, the first supposed to reproduce the mis-alignment conditions during the first data taking while the second one related to long term data taking condition. [...]
CMS-CR-2006-023.-
Geneva : CERN, 2006 - 6 p.
Fulltext: PDF;
In : 1st Workshop on Tracking in High Multiplicity Environments, Zurich, Switzerland, 3 - 7 Oct 2005
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7.
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Simulation of Misalignment Scenarios for CMS Tracking Devices
/ Belotelov, Ivan ; Buchmüller, O L ; González-Caballero, I ; Heister, Arno ; Lampen, Tapio ; Martínez, P ; Martínez-Rivero, C ; Matorras, Francisco ; Thomas, Maarten ; Valuev, Vyacheslav
This document describes the simulation of the misalignment scenarios for the CMS tracking devices in the framework of the CMS reconstruction package ORCA. We provide first estimates of the expected alignment uncertainties at different stages of the CMS operation, which can be used to study the impact of misalignment on the tracking performance. [...]
CMS-NOTE-2006-008.-
Geneva : CERN, 2006 - 12 p.
Fulltext: PDF;
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8.
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Impact of CMS Silicon Tracker Misalignment on Track and Vertex Reconstruction
/ Vanlaer, Pascal (IIHE, Univ. Libre de Bruxelles, Bruxelles, Belgium) ; Barbone, Lucia (INFN Bari) ; De Filippis, Nicola (INFN Bari) ; Speer, Thomas (Univ. Zurich) ; Buchmüller, O L (CERN) ; Schilling, Frank-Peter (CERN)
/CMS Collaboration
The impact of misalignment on the performance of the CMS silicon tracking devices Pixel and silicon Strip tracker is studied. Misalignment scenarios are used which are expected to resemble the tracker configuration at the LHC start-up as well as after a full track based alignment. [...]
CMS-NOTE-2006-029.-
Geneva : CERN, 2006 - 13 p.
- Published in : Nucl. Instrum. Methods Phys. Res., A 566 (2006) 45-49
Fulltext: PDF;
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9.
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Alignment of the Cosmic Rack with the Hits and Impact Points Algorithm
/ Lampen, Tapio ; Karimäki, Veikko ; Saarinen, S ; Buchmüller, O L
We present first results of a track based alignment procedure applied to test beam data recorded with Cosmic Rack, a test setup which mimicks the outer barrel of the CMS Tracker.The Hits and Impact Points alignment method is used within the CMS reconstruction software framework to align this telescope-like device. These results were compared to results obtained with manual alignment and to results obtained with the Millepede algorithm.This study demonstrates that the software implementation of the recently developed alignment tools works properly and also represents the first track based alignment results in CMS using real data..
CMS-NOTE-2006-006.-
Geneva : CERN, 2006 - 8 p.
Fulltext: PDF;
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10.
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Fitting of Event Topologies with External Kinematic Constraints in CMS
/ D'Hondt, Jorgen ; Lowette, Steven ; Buchmüller, O L ; Cucciarelli, Susanna ; Schilling, Frank-Peter ; Spiropulu, Maria ; Paktinat-Mehdiabadi, S ; Benedetti, Daniele ; Pape, Luc
The resolution of the measured objects in the final state of proton collisions at the Large Hadron Collider can be improved by forcing well-defined kinematic hypotheses on the event. The kinematic constraints proposed by the hypotheses can be applied by means of Lagrange multipliers in a general event-by-event least square fitting technique. [...]
CMS-NOTE-2006-023.-
Geneva : CERN, 2006 - 19 p.
Fulltext: PDF;
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