Discovery potential of the Standard Model Higgs in CMS at the LHC

This thesis presents the discovery potential of the Standard Model Higgs boson in the CMS experiment at the LHC. Detailed studies have been carried out to evaluate the detector performance in the difficult $\rm H\to\gamma\gamma$ channel. The electromagnetic crystal calorimeter is of main importance in this channel and it has been designed according stringent performance requirements. Test beam data of lead tungstate crystals have been analysed and it is shown that the performance of the crystals can meet the requirements. The Higgs decay into two photons has been studied with full detector simulation and the Higgs mass has been reconstructed. A potential danger for the photon measurement are the photon conversions in the detector material in front of the electromagnetic calorimeter. Different methods to recover these converted photons are developed and it is shown that, including the recovered conversions does not degrade the Higgs mass resolution. To complete the full Standard Model Higgs discovery range, studies of the other decay channels are reviewed and updated taking into account the next to leading order corrections to the cross-sections. A new study for the $\rm H\to ZZ\to2$l2$\nu$ channel shows that it can give an important contribution above m\sb{\rm H} = 400 GeV. An estimate of the integrated luminosity needed for an observable Higgs signal is derived. It is shown that a fast discovery (integrated luminosity less than 10 fb\sp{-1}) can be expected if the Higgs mass is in the range of 130-550 GeV. The most difficult regions are the low mass range (m\sb{\rm H}600 GeV). With 100 fb\sp{-1} of integrated luminosity the full mass range can be covered

Reinterpretation of LHC results for new physics : status and recommendations after run 2

We report on the status of efforts to improve the reinterpretation of searches and measurements at the LHC in terms of models for new physics, in the context of the LHC Reinterpretation Forum. We detail current experimental offerings in direct searches for new particles, measurements, technical implementations and Open Data, and provide a set of recommendations for further improving the presentation of LHC results in order to better enable reinterpretation in the future. We also provide a brief description of existing software reinterpretation frameworks and recent global analyses of new physics that make use of the current data.Peer reviewe

Using CMS Open Data in research – challenges and directions

The CMS experiment at CERN has released research-quality data from particle collisions at the LHC since 2014. Almost all data from the first LHC run in 2010–2012 with the corresponding simulated samples are now in the public domain, and several scientific studies have been performed using these data. This paper summarizes the available data and tools, reviews the challenges in using them in research, and discusses measures to improve their usability.Peer reviewe

Open data provenance and reproducibility : a case study from publishing CMS open data

In this paper we present the latest CMS open data release published on the CERN Oopen Data portal. Samples of collision and simulated datasets were released together with detailed information about the data provenance. The associated data production chains cover the necessary computing environments, the configuration files and the computational procedures used in each data production step. We describe data curation techniques used to obtain and publish the data provenance information and we study the possibility of reproducing parts of the released data using the publicly available information. The present work demonstrates the usefulness of releasing selected samples of raw and primary data in order to fully ensure the completeness of information about the data production chain for the attention of general data scientists and other non-specialists interested in using particle physics data for education or research purposes.In this paper we present the latest CMS open data release published on the CERN Oopen Data portal. Samples of collision and simulated datasets were released together with detailed information about the data provenance. The associated data production chains cover the necessary computing environments, the configuration files and the computational procedures used in each data production step. We describe data curation techniques used to obtain and publish the data provenance information and we study the possibility of reproducing parts of the released data using the publicly available information. The present work demonstrates the usefulness of releasing selected samples of raw and primary data in order to fully ensure the completeness of information about the data production chain for the attention of general data scientists and other non-specialists interested in using particle physics data for education or research purposes.Peer reviewe

CMS The Computing Project : Technical Design Report

Peer reviewe

Performance of CMS Muon Reconstruction in Cosmic-Ray Events

Peer reviewe

Measurement of W-gamma and Z-gamma production in pp collisions at sqrt(s) = 7 TeV

Peer reviewe

Reinterpretation of LHC Results for New Physics: Status and recommendations after Run 2

We report on the status of efforts to improve the reinterpretation of searches and measurements at the LHC in terms of models for new physics, in the context of the LHC Reinterpretation Forum. We detail current experimental offerings in direct searches for new particles, measurements, technical implementations and Open Data, and provide a set of recommendations for further improving the presentation of LHC results in order to better enable reinterpretation in the future. We also provide a brief description of existing software reinterpretation frameworks and recent global analyses of new physics that make use of the current data

Implementing long-term data preservation and open access in CMS

Implementation of the CMS policy on long-term data preservation, re-use and open access has started. Current practices in providing data additional to published papers and distributing simplified data-samples for outreach are promoted and consolidated. The first measures have been taken for analysis and data preservation for the internal use of the collaboration and for open access to part of the data. Two complementary approaches are followed. First, a virtual machine environment, which will pack all ingredients needed to compile and run a software release with which the legacy data was reconstructed. Second, a validation framework, maintaining the capability not only to read the old raw data, but also to reprocess them with an updated release or to another format to guarantee long-term reusability of the legacy data

RD50 Status Report 2008 - Radiation hard semiconductor devices for very high luminosity colliders

The objective of the CERN RD50 Collaboration is the development of radiation hard semiconductor detectors for very high luminosity colliders, particularly to face the requirements of a possible upgrade scenario of the LHC.This document reports the status of research and main results obtained after the sixth year of activity of the collaboration