CERN Accelerating science

TOTEM Papers

First determination of the ρ parameter at √s = 13 TeV – probing the existence of a colourless three-gluon bound state / Antchev, G. ; Aspell, P. ; Atanassov, I. ; Avati, V. ; Baechler, J. ; Barrera, C. B. ; Berardi, V. ; Berretti, M. ; Bossini, E. ; Bottigli, U. et al. /TOTEM
The TOTEM experiment at the LHC has performed the first measurement at √s = 13 TeV of the ρ parameter, the real to imaginary ratio of the nuclear elastic scattering amplitude at t = 0, obtaining the following results: ρ = 0.09 ± 0.01 and ρ = 0.10 ± 0.01, depending on different physics assumptions and mathematical modelling. The unprecedented precision of the ρ measurement, combined with the TOTEM total cross-section measurements in an energy range larger than 10TeV (from 2.76 to 13TeV), has implied the exclusion of all the models classified and published by COMPETE. [...]
CERN-EP-2017-335.- Geneva : CERN, 2017 - 28. Draft (restricted): PDF; Fulltext: PDF;

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First measurement of elastic, inelastic and total cross-section at sqrt(s)= 13 TeV by TOTEM and overview of cross-section data at LHC energies / Antchev, G. (Sofiya, Inst. Nucl. Res.) ; Aspell, P. (CERN) ; Atanassov, I. (Sofiya, Inst. Nucl. Res.) ; Avati, V. (AGH-UST, Cracow ; CERN) ; Baechler, J. (CERN) ; Barrera, C.B. (Kansas U.) ; Berardi, V. (INFN, Bari ; Bari U.) ; Berretti, M. (Helsinki Inst. of Phys.) ; Bossini, E. (INFN, Siena) ; Bottigli, U. (INFN, Siena) et al. /TOTEM
The TOTEM collaboration has measured the proton-proton total cross section at sqrt(s) = 13 TeV with a luminosity-independent method. Using dedicated beta ∗ = 90 m beam optics, the Roman Pots were inserted very close to the beam. [...]
CERN-EP-2017-321; CERN-EP-2017-321-V2; arXiv:1712.06153.- Geneva : CERN, 2017 - 16 p. Draft (restricted): PDF; Fulltext: cross_section_measurement_at_13_TeV_CERN-EP-2017-321-02 - PDF; CERN-EP-2017-321 - PDF; Preprint: PDF; External link: Gizmodo article

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Diamond Detectors for the TOTEM Timing Upgrade / TOTEM Collaboration
This paper describes the design and the performance of the timing detector developed by the TOTEM Collaboration for the Roman Pots (RPs) to measure the Time-Of-Flight (TOF) of the protons produced in central diffractive interactions at the LHC. The measurement of the TOF of the protons allows the determination of the longitudinal position of the proton interaction vertex and its association with one of the vertices reconstructed by the CMS detectors. [...]
arXiv:1701.05227; CERN-EP-2016-317.- Geneva : CERN, 2017-03-09 - 28 p. - Published in : JINST 12 (2017) P03007 Fulltext: PDF; Preprint: PDF;

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Measurement of Elastic pp Scattering at $\sqrt{s}$ = 8 TeV in the Coulomb-Nuclear Interference Region – Determination of the $\rho$ Parameter and the Total Cross-Section / TOTEM collaboration
The TOTEM experiment at the CERN LHC has measured elastic proton-proton scattering at the centre-of-mass energy $\sqrt{s}$ = 8 TeV and four-momentum transfers squared, $|t|$, from $6\times10^{-4}$ GeV$^2$ to 0.2 GeV$^2$. Near the lower end of the $t$-interval the differential cross-section is sensitive to the interference between the hadronic and the electromagnetic scattering amplitudes. [...]
arXiv:1610.00603; CERN-PH-EP-2015-325; TOTEM-2015-002.- Geneva : CERN, 2016 - 31 p. - Published in : Eur. Phys. J. C 76 (2016) 661 Draft (restricted): PDF; Fulltext: PDF; Springer Open Access article: PDF; External link: Preprint

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Evidence for Non-Exponential Elastic Proton-Proton Differential Cross-Section at Low |t| and $\sqrt{s}$ = 8 TeV by TOTEM / Antchev, G. (Sofiya, Inst. Nucl. Res.) ; Aspell, P. (CERN) ; Atanassov, I. (CERN ; Sofiya, Inst. Nucl. Res.) ; Avati, V. (CERN) ; Baechler, J. (Case Western Reserve U. ; CERN) ; Berardi, V. (INFN, Bari) ; Berretti, M. (INFN, Pisa ; INFN, Siena) ; Bossini, E. (CERN) ; Bottigli, U. (INFN, Siena ; U. Siena (main)) ; Bozzo, M. (Genoa U. ; INFN, Genoa) et al.
The TOTEM experiment has made a precise measurement of the elastic proton-proton differential cross-section at the centre-of-mass energy $\sqrt{s}$ = 8TeV based on a high-statistics data sample obtained with the $\beta$* = 90m optics. Both the statistical and systematic uncertainties remain below 1%, except for the t-independent contribution from the overall normalisation. [...]
CERN-PH-EP-2015-083; arXiv:1503.08111; CERN-PH-EP-2015-083.- Geneva : CERN, 2015 - 18 p. - Published in : Nucl. Phys. B 899 (2015) 527-546 Article from SCOAP3: PDF; Draft (restricted): PDF; Elsevier Open Access article: PDF; Fulltext: PDF; Preprint: PDF; External link: Preprint

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Measurement of the forward charged particle pseudorapidity density in pp collisions at √s = 8 TeV using a displaced interaction point / TOTEM Collaboration
The the pseudorapidity density of charged particles dN$_{ch}$/d$\eta$ is measured by the TOTEM experiment in pp collisions at √s = 8 TeV within the range 3.9 < $\eta$ < 4.7 and −6.95 < $\eta$ < −6.9. Data were collected in a low intensity LHC run with collisions occurring at a distance of 11.25 m from the nominal interaction point. [...]
arXiv:1411.4963; CERN-PH-EP-2014-260.- Geneva : CERN, 2015 - 9 p. - Published in : Eur. Phys. J. C 75 (2015) 126 Draft (restricted): PDF; Fulltext: PDF; Preprint: PDF; Springer Open Access article: PDF;

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Measurement of pseudorapidity distributions of charged particles in proton-proton collisions at $\sqrt{s}$ = 8 TeV by the CMS and TOTEM experiments / CMS and TOTEM Collaborations
Pseudorapidity ($\eta$) distributions of charged particles produced in proton-proton collisions at a centre-of-mass energy of 8 TeV are measured in the ranges abs($\eta$) < 2.2 and 5.3 < abs($\eta$) < 6.4 covered by the CMS and TOTEM detectors, respectively. The data correspond to an integrated luminosity of 45 inverse microbarns. [...]
CMS-FSQ-12-026; CERN-PH-EP-TOTEM-2014-002; CERN-PH-EP-2014-063; arXiv:1405.0722; CMS-FSQ-12-026; CERN-PH-EP-TOTEM-2014-002; CERN-PH-EP-2014-063.- Geneva : CERN, 2014-10-29 - 26 p. - Published in : Eur. Phys. J. C 74 (2014) 3053 Article from SCOAP3: PDF; Preprint: PDF; Springer Open Access article: PDF; External link: Fulltext

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LHC Optics Measurement with Proton Tracks Detected by the Roman Pots of the TOTEM Experiment / TOTEM collaboration
Precise knowledge of the beam optics at the LHC is crucial to fulfil the physics goals of the TOTEM experiment, where the kinematics of the scattered protons is reconstructed with the near-beam telescopes -- so-called Roman Pots (RP). Before being detected, the protons' trajectories are influenced by the magnetic fields of the accelerator lattice. [...]
CERN-PH-EP-2014-066; arXiv:1406.0546; CERN-PH-EP-2014-066.- Geneva : CERN, 2014-10-28 - 20 p. - Published in : New J. Phys. 16 (2014) 103041 Draft (restricted): PDF; Fulltext: NJP_16_10_103041 - PDF; CERN-PH-EP-2014-066_3 - PDF; IOP Open Access article: PDF; Preprint: PDF; External link: Preprint

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Performance of the Totem Detectors at the LHC / TOTEM Collaboration
The TOTEM Experiment is designed to measure the total proton-proton cross-section with the luminosity-independent method and to study elastic and diffractive pp scattering at the LHC. To achieve optimum forward coverage for charged particles emitted by the pp collisions in the interaction point IP5, two tracking telescopes, T1 and T2, are installed on each side of the IP in the pseudorapidity region 3.1 $\le |\eta| \le $6.5, and special movable beam-pipe insertions – called Roman Pots (RP) – are placed at distances of ±147m and ±220m from IP5. [...]
arXiv:1310.2908; CERN-PH-EP-2013-173; TOTEM-2013–02.- Geneva : CERN, 2013 - 34 p. - Published in : Int. J. Mod. Phys. A 28 (2013) 1330046 Draft (restricted): PDF; Fulltext: PDF; World Scientific Open Access article: PDF; External link: Preprint

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Double diffractive cross-section measurement in the forward region at LHC / TOTEM Collaboration
The first double diffractive cross-section measurement in the very forward region has been carriedout by the TOTEM experiment at the LHC with center-of-mass energy of √s = 7 TeV. By utilizingthe very forward TOTEM tracking detectors T1 and T2, which extend up to pseudo rapidity |$\eta$|=6.5, a clean sample of double diffractive pp events was extracted. [...]
CERN-PH-EP-2013-170; arXiv:1308.6722; CERN-PH-EP-2013-170.- Geneva : CERN, 2013-12-26 - 6 p. - Published in : Phys. Rev. Lett. 111 (2013) 262001 APS Open Access article: PDF; Draft (restricted): PDF; Fulltext: PDF; Preprint: PDF;

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