The CMS-TOTEM Precision Proton Spectrometer and first physics results.

Mulargia R. per la Collaborazione CMS TOTEM

Comunicazione
I - Fisica nucleare e subnucleare
Aula 32C-3 - Martedì 18 h 09:00 - 13:00
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The CT-PPS (CMS-TOTEM Precision Proton Spectrometer) detector system consists of silicon tracking stations as well as timing detectors to measure both the position and direction of protons and their time-of-flight with high precision. They are located at around 200 m from the interaction point in the very forward region on both sides of the CMS experiment. The CT-PPS is built to study the Central Exclusive Production (CEP) in proton-proton collisions at LHC, including photon-photon production of W and Z boson pairs, high-mass diphoton and dilepton production, high-pT jet production, as well as searches for anomalous couplings and new resonances. The CT-PPS detector has taken data at high luminosity while fully integrated to the CMS data acquisition system. The total data collected correspond to around 55 $fb^{-1}$. In this presentation, the CT-PPS operation, commissioning and performance are discussed. The measurements of dilepton and diphoton production in photon-photon fusion with the CT-PPS are presented. For the first time, exclusive dilepton production at high masses have been observed in the CMS detector while one or two outgoing protons are measured in the CT-PPS using around 10 $fb^{-1}$ of data accumulated in 2016 during high-luminosity LHC operation. These first results show a good understanding, calibration and alignment of the new CT-PPS detectors. Preliminary results concerning the search for high-mass exclusive diphoton production are presented.

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