TOTEM experiment

Last updated
Large Hadron Collider
(LHC)
LHC.svg
Plan of the LHC experiments and the preaccelerators.
LHC experiments
ATLAS A Toroidal LHC Apparatus
CMS Compact Muon Solenoid
LHCb LHC-beauty
ALICE A Large Ion Collider Experiment
TOTEM Total Cross Section, Elastic Scattering and Diffraction Dissociation
LHCf LHC-forward
MoEDAL Monopole and Exotics Detector At the LHC
FASER ForwArd Search ExpeRiment
SND Scattering and Neutrino Detector
LHC preaccelerators
p and Pb Linear accelerators for protons (Linac 4) and lead (Linac 3)
(not marked) Proton Synchrotron Booster
PS Proton Synchrotron
SPS Super Proton Synchrotron

The TOTEM experiment (TOTal Elastic and diffractive cross section Measurement) is one of the nine detector experiments at CERN's Large Hadron Collider. The other eight are: ATLAS, ALICE, CMS, LHCb, LHCf, MoEDAL, FASER and SND@LHC. It shares an interaction point with CMS. The detector aims at measurement of total cross section, elastic scattering, and diffraction processes. The primary instrument of the detector is referred to as a Roman pot. In December 2020, the D0 and TOTEM Collaborations made public the odderon discovery based on a purely data driven approach in a CERN and Fermilab approved preprint that was later published in Physical Review Letters. [1] In this experimental observation, the TOTEM proton-proton data in the region of the diffractive minimum and maximum was extrapolated from 13, 8, 7 and 2.76 TeV to 1.96 TeV and compared this to D0 data at 1.96 TeV in the same t-range giving an odderon significance of 3.4 σ. When combined with TOTEM experimental data at 13 TeV at small scattering angles providing an odderon significance of 3.4 - 4.6 σ, the combination resulted in an odderon significance of at least 5.2 σ. [2]

Contents

TOTEM tunnel.jpg
TOTEM experiment in the LHC tunnel
TOTEM.jpg
The roman pot of TOTEM experiment.

See also

References

  1. Abazov, V. M.; et al. (4 August 2021). "Odderon Exchange from Elastic Scattering Differences between pp and ppbar Data at 1.96 TeV and from pp Forward Scattering Measurements". Physical Review Letters. 127 (6): 062003. arXiv: 2012.03981 . Bibcode:2021PhRvL.127f2003A. doi:10.1103/PhysRevLett.127.062003. PMID   34420329. S2CID   227737845.
  2. "Odderon discovered". CERN Courier. 2021-03-09. Retrieved 2022-02-11.

Further reading

46°18′35″N6°04′35″E / 46.30972°N 6.07639°E / 46.30972; 6.07639