The FP420 R&D Project: Higgs and New Physics with Forward Protons at the LHC

By M. Albrow, R. Appleby, M. Arneodo, G. Atoian, I. Azhgirey, R. Barlow, I. Bayshev, W. Beaumont, L. Bonnet, A. Brandt and 87 more. 2008

180 citations recorded by the source corpus.

We present the FP420 R&D project, which has been studying the key aspects of the development and installation of a silicon tracker and fast-timing detectors in the LHC tunnel at 420 m from the interaction points of the ATLAS and CMS experiments. These detectors would measure precisely very forward protons in conjunction with the corresponding central detectors as a means to study Standard Model (SM) physics, and to search for and characterise new physics signals. This report includes a detailed description of the physics case for the detector and, in particular, for the measurement of Central Exclusive Production, pp?p++p, in which the outgoing protons remain intact and the central system may be a single particle such as a SM or MSSM Higgs boson. Other physics topics discussed are ?? and ?p interactions, and diffractive processes. The report includes a detailed study of the trigger strategy, acceptance, reconstruction efficiencies, and expected yields for a particular pp?pHp measurement with Higgs boson decay in the b mode. The document also describes the detector acceptance as given by the LHC beam optics between the interaction points and the FP420 location, the machine backgrounds, the new proposed connection cryostat and the moving (``Hamburg'') beam-pipe at 420 m, and the radio-frequency impact of the design on the LHC. The last part of the document is devoted to a description of the 3D silicon sensors and associated tracking performances, the design of two fast-timing detectors capable of accurate vertex reconstruction for background rejection at high-luminosities, and the detector alignment and calibration strategy.

Subfields: Nuclear and High Energy Physics, Radiation

View Paper: https://www.semanticscholar.org/paper/3644ffc3017d65cf6e0145a7b95687ff312a2004

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Citations in the corpus

Central Exclusive Particle Production at High Energy Hadron Colliders (2010, methodology): “Firstly, precision measurements of the scattered proton momenta, in very forward detectors, offer the possibility of observing the Higgs as a bump in the missing mass distribution [2].”
A Large Hadron Electron Collider at CERN: Report on the Physics and Design Concepts for Machine and Detector (2012, background): “The ATLAS and CMS collaborations have investigated the feasibility of installing detectors along the LHC beam line to measure the energy and momentum of such diffractively scattered protons [941].”
Implications of LHCb measurements and future prospects - eScholarship (2013, background): “More ambitiously, the deployment of semi-conductor detectors very close to the beam, within Roman pots, several hundred meters away from the interaction point, as proposed for other LHC experiments [605] would also be beneficial for LHCb.”
A review of the mass measurement techniques proposed for the Large Hadron Collider (2010, background): “3 For pp → ppX the centre-of-mass four-vector can be fully reconstructed from the outgoing proton momenta if dedicated detectors are installed at very high |η| [8, 9].”