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ENEA-IRIS Open Archive è l’archivio della produzione scientifica dell'ENEA, realizzato con l'obiettivo di raccogliere, catalogare e rendere facilmente accessibili in rete i risultati della ricerca. Gli autori dell’ENEA provvedono a depositare le proprie pubblicazioni (articoli su rivista, presentazioni a congressi, report, ecc.). In particolare, quelle finanziate dalla Commissione Europea nell’ambito del programma H2020 (che prevede il deposito obbligatorio in un Repository), una volta caricate, vengono automaticamente importate dal portale europeo OpenAIRE. È possibile inserire, o importare direttamente dalle banche dati previste, le informazioni descrittive del documento e anche allegare, ove consentito dalla normativa sul diritto d'autore, il testo completo della pubblicazione.
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A measurement of dielectron production in proton-proton (pp) collisions at sqrt[s]=13 TeV, recorded with the ALICE detector at the CERN LHC, is presented in this Letter. The data set was recorded with a reduced magnetic solenoid field. This enables the investigation of a kinematic domain at low dielectron (ee) invariant mass m_{ee} and pair transverse momentum p_{T,ee} that was previously inaccessible at the LHC. The cross section for dielectron production is studied as a function of m_{ee}, p_{T,ee}, and event multiplicity dN_{ch}/dη. The expected dielectron rate from hadron decays, called hadronic cocktail, utilizes a parametrization of the measured η/π^{0} ratio in pp and proton-nucleus collisions, assuming that this ratio shows no strong dependence on collision energy at low transverse momentum. Comparison of the measured dielectron yield to the hadronic cocktail at 0.15<0.6 GeV/c^{2} and for p_{T,ee}<0.4 GeV/c indicates an enhancement of soft dielectrons, reminiscent of the "anomalous" soft-photon and soft-dilepton excess in hadron-hadron collisions reported by several experiments under different experimental conditions. The enhancement factor over the hadronic cocktail amounts to 1.61±0.13(stat)±0.17(syst,data)±0.34(syst,cocktail) in the ALICE acceptance. Acceptance-corrected excess spectra in m_{ee} and p_{T,ee} are extracted and compared with calculations of dielectron production from hadronic bremsstrahlung and thermal radiation within a hadronic many-body approach.
Soft-Dielectron Excess in Proton-Proton Collisions at sqrt[s]=13 TeV
Acharya, S;Adamová, D;Adler, A;Adolfsson, J;Aggarwal, M M;Aglieri Rinella, G;Agnello, M;Agrawal, N;Ahammed, Z;Ahmad, S;Ahn, S U;Akbar, Z;Akindinov, A;Al-Turany, M;Alam, S N;Albuquerque, D S D;Aleksandrov, D;Alessandro, B;Alfanda, H M;Alfaro Molina, R;Ali, B;Ali, Y;Alici, A;Alizadehvandchali, N;Alkin, A;Alme, J;Alt, T;Altenkamper, L;Altsybeev, I;Anaam, M N;Andrei, C;Andreou, D;Andronic, A;Angeletti, M;Anguelov, V;Anson, C;Antičić, T;Antinori, F;Antonioli, P;Apadula, N;Aphecetche, L;Appelshäuser, H;Arcelli, S;Arnaldi, R;Arratia, M;Arsene, I C;Arslandok, M;Augustinus, A;Averbeck, R;Aziz, S;Azmi, M D;Badalà, A;Baek, Y W;Bagnasco, S;Bai, X;Bailhache, R;Bala, R;Balbino, A;Baldisseri, A;Ball, M;Balouza, S;Banerjee, D;Barbera, R;Barioglio, L;Barnaföldi, G G;Barnby, L S;Barret, V;Bartalini, P;Bartels, C;Barth, K;Bartsch, E;Baruffaldi, F;Bastid, N;Basu, S;Batigne, G;Batyunya, B;Bauri, D;Bazo Alba, J L;Bearden, I G;Beattie, C;Bedda, C;Behera, N K;Belikov, I;Bell Hechavarria, A D C;Bellini, 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2021-01-01
Abstract
A measurement of dielectron production in proton-proton (pp) collisions at sqrt[s]=13 TeV, recorded with the ALICE detector at the CERN LHC, is presented in this Letter. The data set was recorded with a reduced magnetic solenoid field. This enables the investigation of a kinematic domain at low dielectron (ee) invariant mass m_{ee} and pair transverse momentum p_{T,ee} that was previously inaccessible at the LHC. The cross section for dielectron production is studied as a function of m_{ee}, p_{T,ee}, and event multiplicity dN_{ch}/dη. The expected dielectron rate from hadron decays, called hadronic cocktail, utilizes a parametrization of the measured η/π^{0} ratio in pp and proton-nucleus collisions, assuming that this ratio shows no strong dependence on collision energy at low transverse momentum. Comparison of the measured dielectron yield to the hadronic cocktail at 0.15<0.6 GeV/c^{2} and for p_{T,ee}<0.4 GeV/c indicates an enhancement of soft dielectrons, reminiscent of the "anomalous" soft-photon and soft-dilepton excess in hadron-hadron collisions reported by several experiments under different experimental conditions. The enhancement factor over the hadronic cocktail amounts to 1.61±0.13(stat)±0.17(syst,data)±0.34(syst,cocktail) in the ALICE acceptance. Acceptance-corrected excess spectra in m_{ee} and p_{T,ee} are extracted and compared with calculations of dielectron production from hadronic bremsstrahlung and thermal radiation within a hadronic many-body approach.
Nuclear Experiment Nuclear Experiment High Energy Physics - Experiment
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.12079/63947
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