Physics:LHCf experiment

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Large Hadron Collider
(LHC)
LHC.svg
LHC experiments
ATLASA Toroidal LHC Apparatus
CMSCompact Muon Solenoid
LHCbLHC-beauty
ALICEA Large Ion Collider Experiment
TOTEMTotal Cross Section, Elastic Scattering and Diffraction Dissociation
LHCfLHC-forward
MoEDALMonopole and Exotics Detector At the LHC
FASERForwArd Search ExpeRiment
LHC preaccelerators
p and PbLinear accelerators for protons (Linac 2) and Lead (Linac 3)
(not marked)Proton Synchrotron Booster
PSProton Synchrotron
SPSSuper Proton Synchrotron

The LHCf (Large Hadron Collider forward) is a special-purpose Large Hadron Collider experiment for astroparticle (cosmic ray) physics, and one of nine detectors in the LHC accelerator at CERN. LHCf is designed to study the particles generated in the forward region of collisions, those almost directly in line with the colliding proton beams.[1]

The LHCf experiment in the LHC tunnel

Purpose

The LHCf is intended to measure the energy and numbers of neutral pions (π0) produced by the collider. This will hopefully help explain the origin of ultra-high-energy cosmic rays (UHECRs).[2][3] Detecting UHECRs is performed through observations of secondary particle showers produced when a UHECR interacts with the atmosphere. The LHCf experiment is designed to measure the very-forward region, where most of the energy flow of secondary particles is contained.[3]

The results produced by the LHCf experiment complement other high-energy cosmic ray measurements from the Pierre Auger Observatory in Argentina, and the Telescope Array Project in Utah.[4][5]

Experimental setup

The LHCf setup consists of two independent detectors on either side of the LHC, both 140 m from the ATLAS interaction point.[6][7] The detectors are referred to as Arm 1 and Arm 2 and are installed inside target neutral absorbers (TAN), which protect cryo-magnets from neutral particle debris from the interaction region.[8][9][10]

The two detectors have a common structure of two independent calorimeter towers, for photon and neutron measurements. The towers are made from tungsten absorber layers and scintillator layers, with a difference in the size of transverse sections for the two arms.[11] The calorimeter towers are used to measure incoming particle energy and to identify families of particles. Each detector has a tracking system: the Arm 1 system consists of four double-layers os scintillating fibres; Arm 2 consists of microstrip silicon layers.[12] The energy resolution for the detectors is over 3% for photons above 100 GeV and around 40% for neutrons.[13][3] The position resolution for Arm 1 and Arm 2 is 200 μm and 40 μm for photons respectively, and is around 1 mm for neutrons for both the detectors.[13][14][3]

Results

The first phase of data using the LHCf detectors was recorded in 2009-2013, as part of the LHC's Run 1.[15] The LHCf results at 7 TeV centre-of-mass energy showed good agreement with theoretical models for forward photon and neutral pion production. However, the results did not agree for the forward neutron production.[16][17]

LHCf was able to measure how the number of forward photons and neutrons varies with energy at new high energies. The results of the experiment agree with some theoretical models but disagree with other.[18][19][20]

The current focus of the LHCf is to look out for neutral kaons and neutral eta mesons, particles that include a strange quark. The theoretical models describing this interaction predict secondary muons, but the predicted numbers disagree with experimental data. The LHCf experiment hopes to resolve the "muon puzzle".[21][22]

External links

References

  1. ↑ "LHCf" (in en). 2023-07-21. https://home.cern/science/experiments/lhcf. 
  2. ↑ LHCf Collaboration; Adriani, O.; Berti, E.; Bonechi, L.; Bongi, M.; D’Alessandro, R.; Del Prete, M.; Haguenauer, M. et al. (2016-08-22). "Measurements of longitudinal and transverse momentum distributions for neutral pions in the forward-rapidity region with the LHCf detector". Physical Review D 94 (3): 032007. doi:10.1103/PhysRevD.94.032007. Bibcode: 2016PhRvD..94c2007A. https://link.aps.org/doi/10.1103/PhysRevD.94.032007. 
  3. ↑ 3.0 3.1 3.2 3.3 Tiberio, Alessio; Adriani, O.; Berti, E.; Betti, P.; Bonechi, L.; Bongi, M.; D'Alessandro, R.; Haguenauer, M. et al. (2023-07-25). "The LHCF experiment at the Large Hadron Collider: Status and prospects" (in en). Proceedings of 38th International Cosmic Ray Conference. pp. 444. doi:10.22323/1.444.0444. 
  4. ↑ Noda, K; Adriani, O; Bonechi, L; Bongi, M et al. (Sep 2011). "The LHCf experiment". VI European Summer School on Experimental Nuclear Astrophysics. https://pos.sissa.it/148/066/pdf. 
  5. ↑ "What is LHCf?". 2015-03-03. http://www.uslhc.us/What_is_the_LHC/Experiments/LHCf. 
  6. ↑ "LHCf: a tiny new experiment joins the LHC" (in en-GB). 2006-11-01. https://cerncourier.com/a/lhcf-a-tiny-new-experiment-joins-the-lhc/. 
  7. ↑ Adriani, Oscar (9 Sep 2005). "The LHCf experiment at LHC". http://www.particle.cz/conferences/c2cr2005/talks/Adriani.pdf. 
  8. ↑ Collaboration, The LHCf; Adriani, O; Bonechi, L; Bongi, M; Castellini, G; D'Alessandro, R; Faus, D A; Fukui, K et al. (2008-08-14). "The LHCf detector at the CERN Large Hadron Collider". Journal of Instrumentation 3 (8): S08006. doi:10.1088/1748-0221/3/08/S08006. ISSN 1748-0221. Bibcode: 2008JInst...3S8006L. 
  9. ↑ Piparo, Giuseppe (2023-07-25). "Measurement of the very forward π0 and η meson productions in p-p collisions at √s=13 TeV with the LHCF detector" (in en). Proceedings of 38th International Cosmic Ray Conference. pp. 447. doi:10.22323/1.444.0447. 
  10. ↑ Adriani, O.; Bonechi, L.; Bongi, M.; Castellini, G.; D'alessandro, R.; Haguenauer, M.; Iso, T.; Itow, Y. et al. (2013-10-10). "LHCf DETECTOR PERFORMANCE DURING THE 2009–2010 LHC RUN". International Journal of Modern Physics A 28 (25): 1330036. doi:10.1142/S0217751X13300366. ISSN 0217-751X. Bibcode: 2013IJMPA..2830036A. https://www.worldscientific.com/doi/abs/10.1142/S0217751X13300366. 
  11. ↑ Makino, Y.; Tiberio, A.; Adriani, O.; Berti, E.; Bonechi, L.; Bongi, M.; Caccia, Z.; D'Alessandro, R. et al. (2017-03-21). "Performance study for the photon measurements of the upgraded LHCf calorimeters with Gd 2 SiO 5 (GSO) scintillators". Journal of Instrumentation 12 (3): P03023. doi:10.1088/1748-0221/12/03/P03023. ISSN 1748-0221. Bibcode: 2017JInst..12P3023M. https://iopscience.iop.org/article/10.1088/1748-0221/12/03/P03023. 
  12. ↑ Bonechi, Lorenzo (2008-03-01). "LHCf: a LHC Detector for Astroparticle Physics" (in en). Nuclear Physics B - Proceedings Supplements. Proceedings of the Hadron Collider Physics Symposium 2007 177-178: 263–264. doi:10.1016/j.nuclphysbps.2007.11.122. ISSN 0920-5632. Bibcode: 2008NuPhS.177..263B. https://www.sciencedirect.com/science/article/pii/S0920563207009516. 
  13. ↑ 13.0 13.1 Makino, Y.; Tiberio, A.; Adriani, O.; Berti, E.; Bonechi, L.; Bongi, M.; Caccia, Z.; D'Alessandro, R. et al. (2017-03-21). "Performance study for the photon measurements of the upgraded LHCf calorimeters with Gd 2 SiO 5 (GSO) scintillators". Journal of Instrumentation 12 (3): P03023. doi:10.1088/1748-0221/12/03/P03023. ISSN 1748-0221. Bibcode: 2017JInst..12P3023M. https://iopscience.iop.org/article/10.1088/1748-0221/12/03/P03023. 
  14. ↑ Adriani, O; Bonechi, L; Bongi, M; Castellini, G; Ciaranfi, R; D'Alessandro, R; Grandi, M; Papini, P et al. (2010-01-26). "The construction and testing of the silicon position sensitive modules for the LHCf experiment at CERN". Journal of Instrumentation 5 (1): P01012. doi:10.1088/1748-0221/5/01/P01012. ISSN 1748-0221. Bibcode: 2010JInst...5.1012A. https://iopscience.iop.org/article/10.1088/1748-0221/5/01/P01012. 
  15. ↑ "LHC report: Run 1 - the final flurry" (in en). 2023-07-21. https://home.cern/news/news/accelerators/lhc-report-run-1-final-flurry. 
  16. ↑ "Smaller LHC collaborations to analyse collisions at 13 TeV" (in en). 2023-07-21. https://home.cern/news/news/accelerators/smaller-lhc-collaborations-analyse-collisions-13-tev. 
  17. ↑ Adriani, O.; Berti, E.; Bonechi, L.; Bongi, M.; Castellini, G.; D'Alessandro, R.; Del Prete, M.; Haguenauer, M. et al. (Nov 2015). "Measurement of very forward neutron energy spectra for 7 TeV proton--proton collisions at the Large Hadron Collider". Physics Letters B 750: 360–366. doi:10.1016/j.physletb.2015.09.041. Bibcode: 2015PhLB..750..360A. 
  18. ↑ "LHCf gears up to probe birth of cosmic-ray showers" (in en). 2023-07-21. https://home.cern/news/news/experiments/lhcf-gears-probe-birth-cosmic-ray-showers. 
  19. ↑ Adriani, O.; Berti, E.; Bonechi, L.; Bongi, M.; D'Alessandro, R.; Haguenauer, M.; Itow, Y.; Iwata, T. et al. (2018-05-10). "Measurement of forward photon production cross-section in proton–proton collisions at √s = 13TeV with the LHCf detector" (in en). Physics Letters B 780: 233–239. doi:10.1016/j.physletb.2017.12.050. ISSN 0370-2693. 
  20. ↑ Adriani, O.; Berti, E.; Bonechi, L.; Bongi, M.; D’Alessandro, R.; Detti, S.; Haguenauer, M.; Itow, Y. et al. (2018-11-12). "Measurement of inclusive forward neutron production cross section in proton-proton collisions at √s = 13 TeV with the LHCf Arm2 detector" (in en). Journal of High Energy Physics 2018 (11): 73. doi:10.1007/JHEP11(2018)073. ISSN 1029-8479. 
  21. ↑ "LHCf continues to investigate cosmic rays" (in en). 2023-07-21. https://home.cern/news/news/experiments/lhcf-continues-investigate-cosmic-rays. 
  22. ↑ Albrecht, Johannes; Cazon, Lorenzo; Dembinski, Hans; Fedynitch, Anatoli; Kampert, Karl-Heinz; Pierog, Tanguy; Rhode, Wolfgang; Soldin, Dennis et al. (2022-03-09). "The Muon Puzzle in cosmic-ray induced air showers and its connection to the Large Hadron Collider" (in en). Astrophysics and Space Science 367 (3): 27. doi:10.1007/s10509-022-04054-5. ISSN 1572-946X. Bibcode: 2022Ap&SS.367...27A. https://doi.org/10.1007/s10509-022-04054-5. 

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