he first study of the shapes of jets arising from bottom (b) quarks in heavy ion collisions is presented. Jet shapes are studied using charged hadron constituents as a function of their radial distance from the jet axis. Lead-lead (PbPb) collision data at a nucleon-nucleon center-of-mass energy of sNN=5.02TeV were recorded by the CMS detector at the LHC, with an integrated luminosity of 1.69nb−1. Compared to proton-proton collisions, a redistribution of the energy in b jets to larger distances from the jet axis is observed in PbPb collisions. This medium-induced redistribution is found to be substantially larger for b jets than for inclusive jets. in a compositeness scenario. The analysis is performed using a sample of proton-proton collisions at √s = 13 TeV recorded by the CMS experiment at the CERN LHC, corresponding to an integrated luminosity of 138 fb−1. The data are found to be in agreement with the standard model prediction. For the process in which the N is produced in association with a lepton, followed by the decay of the N to a sameflavor lepton and a quark pair, an upper limit at 95% confidence level on the product of the cross section and branching fraction is obtained as a function of the N mass mN and the compositeness scale . For this model the data exclude the existence of Ne (Nμ ) for mN below 6.0 (6.1) TeV, at the limit where mN is equal to . For mN ≈ 1 TeV, values of  less than 20 (23) TeV are excluded. These results represent a considerable improvement in sensitivity, covering a larger parameter space than previous searches in pp collisions at 13 TeV

Tumasyan, A., Adam, W., Andrejkovic, J.W., Bergauer, T., Chatterjee, S., Damanakis, K., et al. (2023). Search for a heavy composite Majorana neutrino in events with dilepton signatures from proton-proton collisions at √s=13 Tev. PHYSICS LETTERS. SECTION B, 843, 1-25 [10.1016/j.physletb.2023.137803].

Search for a heavy composite Majorana neutrino in events with dilepton signatures from proton-proton collisions at √s=13 Tev

Battilana, C;Bonacorsi, D;Borgonovi, L;Castro, A;Cuffiani, M;Diotalevi, T;Fanfani, A;Giommi, L;Guiducci, L;Lunerti, L;Rovelli, T;Siroli, GP;
2023

Abstract

he first study of the shapes of jets arising from bottom (b) quarks in heavy ion collisions is presented. Jet shapes are studied using charged hadron constituents as a function of their radial distance from the jet axis. Lead-lead (PbPb) collision data at a nucleon-nucleon center-of-mass energy of sNN=5.02TeV were recorded by the CMS detector at the LHC, with an integrated luminosity of 1.69nb−1. Compared to proton-proton collisions, a redistribution of the energy in b jets to larger distances from the jet axis is observed in PbPb collisions. This medium-induced redistribution is found to be substantially larger for b jets than for inclusive jets. in a compositeness scenario. The analysis is performed using a sample of proton-proton collisions at √s = 13 TeV recorded by the CMS experiment at the CERN LHC, corresponding to an integrated luminosity of 138 fb−1. The data are found to be in agreement with the standard model prediction. For the process in which the N is produced in association with a lepton, followed by the decay of the N to a sameflavor lepton and a quark pair, an upper limit at 95% confidence level on the product of the cross section and branching fraction is obtained as a function of the N mass mN and the compositeness scale . For this model the data exclude the existence of Ne (Nμ ) for mN below 6.0 (6.1) TeV, at the limit where mN is equal to . For mN ≈ 1 TeV, values of  less than 20 (23) TeV are excluded. These results represent a considerable improvement in sensitivity, covering a larger parameter space than previous searches in pp collisions at 13 TeV
2023
Tumasyan, A., Adam, W., Andrejkovic, J.W., Bergauer, T., Chatterjee, S., Damanakis, K., et al. (2023). Search for a heavy composite Majorana neutrino in events with dilepton signatures from proton-proton collisions at √s=13 Tev. PHYSICS LETTERS. SECTION B, 843, 1-25 [10.1016/j.physletb.2023.137803].
Tumasyan, A; Adam, W; Andrejkovic, JW; Bergauer, T; Chatterjee, S; Damanakis, K; Dragicevic, M; Del Valle, AE; Hussain, PS; Jeitler, M; Krammer, N; Le...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/952957
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