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Studies of CP-Violation in Charmless Three-Body b-Hadron Decays pp 37–60Cite as

The LHCb Detector

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Abstract

The LHCb detector, located at Point 8 on the Large Hadron Collider, is a forward-arm spectrometer designed primarily for the investigation of b- and c-hadron decays, which, when produced in the \(pp \rightarrow b\bar{b}X(c\bar{c}X)\) process, are predominantly distributed in the high pseudorapidity forward region. High-precision tracking close to the interaction point results in exceptional identification of b- and c-hadron decay vertices, and a ring-imaging Cherenkov detector allows excellent separation of different types of charged particles, enabling measurements of suppressed fully-hadronic final states. Nevertheless, the general purpose configuration of the sub-detectors and trigger system allows for a wide variety of physics measurements to be performed.

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Notes

  1. 1.

    The ‘Detector with Lepton, Photon, and Hadron Identification’ (DELPHI) experiment on the Large Electron Positron collider previously inhabited the cavern at Point 8.

  2. 2.

    The aerogel has been removed for Run 2 operations as it did not improve low-momentum performance as much as predicted. Its removal results in fewer uninformative Cherenkov photons, speeding up reconstruction, and a larger \(\mathrm{C}_4 \mathrm{F}_{10}\) volume.

  3. 3.

    A \(5\%\) by volume addition of \(\mathrm {CO}_2\) to quench scintillation was introduced during Run 1 operations [15].

  4. 4.

    There are also candidates that are ‘trigger on both’, where neither the presence of the candidate decay nor the rest of the event is sufficient individually to fire a trigger. Such candidates are rejected however, as the trigger efficiency is not measurable.

  5. 5.

    Fill 5045 in June 2016 was the longest on record so far at over 37 h.

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Authors and Affiliations

  1. Department of Physics, University of Warwick, Coventry, UK

    Daniel O’Hanlon

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  1. Daniel O’Hanlon
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O’Hanlon, D. (2018). The LHCb Detector. In: Studies of CP-Violation in Charmless Three-Body b-Hadron Decays. Springer Theses. Springer, Cham. https://doi.org/10.1007/978-3-030-02206-8_4

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