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This work is concerned with the introduction and development of a technique to optimally position a Mobile Sensor (MS) in a location with adequate side lobe Radio Frequency (RF) signal power. The proposed method involves the generation of a database (DB) of side lobe power distribution for different azimuth angles of the downlink transmitted signal. The generated DB is subsequently used to train and test a Machine Learning (ML) multiclass classifier, as well as two distinct Convolution Neural Networks (CNN), to identify the desired MS location. Simulation experiments are performed which indicate a maximum accuracy of 99.25%, 96.56% and 96.10% for 8 different receiver locations.more » « less
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Free, publicly-accessible full text available January 1, 2026
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The first observation of the concurrent production of two mesons in proton-nucleus collisions is presented. The analysis is based on a proton-lead ( ) data sample recorded at a nucleon-nucleon center-of-mass energy of 8.16 TeV by the CMS experiment at the CERN LHC and corresponding to an integrated luminosity of . The two mesons are reconstructed in their decay channels with transverse momenta and rapidity . Events where one of the mesons is reconstructed in the dielectron channel are also considered in the search. The process is observed with a significance of 5.3 standard deviations. The measured inclusive fiducial cross section, using the four-muon channel alone, is . A fit of the data to the expected rapidity separation for pairs of mesons produced in single (SPS) and double (DPS) parton scatterings yields and , respectively. This latter result can be transformed into a lower bound on the effective DPS cross section, closely related to the squared average interparton transverse separation in the collision, of at 95% confidence level. © 2024 CERN, for the CMS Collaboration2024CERNmore » « lessFree, publicly-accessible full text available November 1, 2025
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A<sc>bstract</sc> A search for the central exclusive production of top quark-antiquark pairs ($$ \textrm{t}\overline{\textrm{t}} $$ ) is performed for the first time using proton-tagged events in proton-proton collisions at the LHC at a centre-of-mass energy of 13 TeV. The data correspond to an integrated luminosity of 29.4 fb−1. The$$ \textrm{t}\overline{\textrm{t}} $$ decay products are reconstructed using the central CMS detector, while forward protons are measured in the CMS-TOTEM precision proton spectrometer. An observed (expected) upper bound on the production cross section of 0.59 (1.14) pb is set at 95% confidence level, for collisions of protons with fractional momentum losses between 2 and 20%.more » « lessFree, publicly-accessible full text available June 1, 2025