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Status of the TOTEM experiment at LHC.

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Title: Status of the TOTEM experiment at LHC.
Authors: Baechler, J.1 joachim.baechler@cern.ch, Antchev, G.2, Aspell, P.1, Atanassov, I.1,2, Avati, V.1, Berardi, V.3,4, Berretti, M.5, Bossini, E.5, Bozzo, M.6,7, Brogi, P.5, Brücken, E.8,9, Buzzo, A.7, Cafagna, F.4, Calicchio, M.3,4, Catanesi, M.G.4, Covault, C.10, Csörgő, T.11, Deile, M.1, Eggert, K.10, Eremin, V.12
Source: Nuclear Instruments & Methods in Physics Research Section A. Aug2013, Vol. 718, p21-25. 5p.
Subjects: Nuclear physics experiments, Large Hadron Collider, Proton-proton interactions, Nuclear cross sections, Luminosity, Elasticity
Abstract: The TOTEM experiment is dedicated to the measurement of the total proton–proton cross-section with the luminosity-independent method and the study of elastic and diffractive scattering processes. Two tracking telescopes, T1 and T2, integrated in the CMS detector, cover the pseudo-rapidity region between 3.1 and 6.5 on both sides of the interaction point IP5. The Roman Pot (RP) stations are located at distances of ±147m and ±220m with respect to the interaction point to measure the very forward scattered protons at very small angles. During the LHC technical stop in winter 2010/2011, the TOTEM experiment was completed with the installation of the T1 telescope and the RP stations at ±147m. In 2011, the LHC machine provided special optics with the large ß⁎=90m, allowing TOTEM to measure the elastic scattering differential cross-section, down to the four-momentum transfer squared |t|=2×10−2 GeV2. Using the optical theorem and extrapolation of the differential cross-section to t=0 (optical point), the total p–p cross-section at the LHC energy of could be computed for the first time. Furthermore we measured with standard LHC beam optics and the energy of the forward charged particle pseudorapidity density dn/dη in the range of 5.3<|η|<6.4. The status of the experiment, the performance of the detectors with emphasis on the RPs are described and the first physics results are presented. [ABSTRACT FROM AUTHOR]
Copyright of Nuclear Instruments & Methods in Physics Research Section A is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Status of the TOTEM experiment at LHC.
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  Data: The TOTEM experiment is dedicated to the measurement of the total proton–proton cross-section with the luminosity-independent method and the study of elastic and diffractive scattering processes. Two tracking telescopes, T1 and T2, integrated in the CMS detector, cover the pseudo-rapidity region between 3.1 and 6.5 on both sides of the interaction point IP5. The Roman Pot (RP) stations are located at distances of &#177;147m and &#177;220m with respect to the interaction point to measure the very forward scattered protons at very small angles. During the LHC technical stop in winter 2010/2011, the TOTEM experiment was completed with the installation of the T1 telescope and the RP stations at &#177;147m. In 2011, the LHC machine provided special optics with the large &#223;⁎=90m, allowing TOTEM to measure the elastic scattering differential cross-section, down to the four-momentum transfer squared |t|=2&#215;10−2 GeV2. Using the optical theorem and extrapolation of the differential cross-section to t=0 (optical point), the total p–p cross-section at the LHC energy of could be computed for the first time. Furthermore we measured with standard LHC beam optics and the energy of the forward charged particle pseudorapidity density dn/dη in the range of 5.3&lt;|η|&lt;6.4. The status of the experiment, the performance of the detectors with emphasis on the RPs are described and the first physics results are presented. [ABSTRACT FROM AUTHOR]
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  Data: &lt;i&gt;Copyright of Nuclear Instruments &amp; Methods in Physics Research Section A is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder&#39;s express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.&lt;/i&gt; (Copyright applies to all Abstracts.)
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