The CMS-TOTEM Precision Proton Spectrometer allows extending the LHC physics program by measuring protons in the very forward regions of CMS. Tracking and timing detectors have been installed along the beam pipe at ∼ 210 m from the CMS interaction point on both sides of the LHC tunnel. The tracking system consists of a station of silicon strip detectors and one of silicon pixel detectors on each side. The latter is composed of six planes of 3D silicon pixel sensors bumpbonded to the PSI46dig ROC developed for the CMS Phase I Pixel Tracker upgrade. A track resolution of ∼ 10 µm is obtained. The future goal is to replace the present strip stations with pixel ones in order to ensure better multi-track reconstruction. Each timing station is made of three planes of diamond detectors and one plane equipped with an Ultra-Fast Silicon Detector (UFSD). A timing resolution of a few tens of picoseconds can be achieved with the present detector; a large R&D effort is ongoing to reach the 10 ps target resolution. This contribution describes the hardware characteristics and the present status of the CT-PPS project. The operational experience during the 2017 data taking is also presented.
Proton tagged photon-photon and gluon-gluon interactions represent a unique way to study the Standard Model, and to search for new physics beyond the Standard Model, in proton-proton collisions at the LHC. The CT-PPS project began operating near-beam detectors housed in Roman Pots during 2016, to detect the forward scattered protons in these processes. The 2016 data was used to develop techniques for alignment and beam optics corrections, and applied to an analysis of γγ → + − production. This resulted in the first observation of this process with tagged protons in the mass range m( + − )>110 GeV. Several upgrades of the detectors since 2016 provide enhanced sensitivity for new physics searches and Standard Model measurements.
We describe the discovery of the colorless C-odd gluonic compound, the odderon, by the D0 and TOTEM Collaborations by comparing elastic differential cross sections measured in pp and pp interactions at high energies Contents 1 Introduction: pp and pp elastic data measuredly the D0 and TOTEM Collaborations 1 2 Prediction on pp elastic dσ/d t at 1.96 TeV from TOTEM data 3 3 Comparison between the elastic dσ/d t measurements from D0 and the extrapolated TOTEM data and the odderon discovery 5 4 Conclusion 6 References 7
Diffractive processes are important non-perturbative phenomena of strong interaction, which are studied in various measurements at the LHC. Recent results of the CMS and TOTEM experiments are presented in this paper. First, the measurement of central exclusive and semiexclusive + − production at 5.02 and 13 TeV is discussed. The total and differential cross sections of final states with T ( ) > 0.2 GeV, | ( )| < 2.4 are measured. In the second part of the paper, the measurement of the total and differential cross sections as functions of four-momentum transfer squared and proton fractional momentum loss , in the 0.03 < | | < 1.0 GeV 2 and 0 < < 0.1 kinematic region, with at least two jets with T > 40 GeV and | | < 4.4 is presented. This latter measurement utilized the proton tagging capabilities of the Roman Pot detectors of the TOTEM experiment.
The process pp → pµ + µ − p ( * ) has been observed at the LHC for dimuon masses larger than 110 GeV in pp collisions at √ s = 13 TeV. Here p ( * ) indicates the second proton is undetected, and either remains intact or dissociates into a low-mass state p * . The scattered proton has been measured in the CMS-TOTEM Precision Proton Spectrometer (CT-PPS). The spectrometer operated for the first time in 2016, collecting ∼10fb −1 of data in regular, high-luminosity fills. The procedure for detector alignment, optics corrections, and data analysis including background estimate are described. The present data constitute the first evidence of this process at such masses. They also demonstrate that CT-PPS performs as expected.
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