A measurement of production cross sections of the Higgs boson in proton-proton collisions is presented in the đ»â†’đœâąđœ decay channel. The analysis is performed using 36.1  fb−1 of data recorded by the ATLAS experiment at the Large Hadron Collider at a center-of-mass energy of √𝑠=13  TeV. All combinations of leptonic (𝜏→ℓⁱ𝑣ⁱ ÂŻ 𝑣 with ℓ=𝑒,𝜇) and hadronic (𝜏→hadrons 𝑣) 𝜏 decays are considered. The đ»â†’đœâąđœ signal over the expected background from other Standard Model processes is established with an observed (expected) significance of 4.4 (4.1) standard deviations. Combined with results obtained using data taken at 7 and 8 TeV center-of-mass energies, the observed (expected) significance amounts to 6.4 (5.4) standard deviations and constitutes an observation of đ»â†’đœâąđœ decays. Using the data taken at √𝑠=13  TeV, the total cross section in the đ»â†’đœâąđœ decay channel is measured to be 3.7⁹7+0.60 −0.59 (stat)ⁱ +0.87 −0.74 (syst)  pb, for a Higgs boson of mass 125 GeV assuming the relative contributions of its production modes as predicted by the Standard Model. Total cross sections in the đ»â†’đœâąđœ decay channel are determined separately for vector-boson-fusion production and gluon-gluon-fusion production to be 𝜎VBF đ»â†’đœâąđœ=0.28±0.09 (stat)ⁱ +0.11 −0.09 (syst)  pb and 𝜎𝑔ⁱ𝑔ⁱF đ»â†’đœâąđœ=3.1±1.0 (stat)ⁱ +1.6 −1.3 (syst)  pb, respectively. Similarly, results of a fit are reported in the framework of simplified template cross sections. All measurements are in agreement with Standard Model expectations.

Aaboud M., A.G. (2019). Cross-section measurements of the Higgs boson decaying into a pair of 𝜏-leptons in proton-proton collisions at √𝑠=13  TeV with the ATLAS detector. PHYSICAL REVIEW D, 99(7), 072001-1-072001-39 [10.1103/PhysRevD.99.072001].

Cross-section measurements of the Higgs boson decaying into a pair of 𝜏-leptons in proton-proton collisions at √𝑠=13  TeV with the ATLAS detector

Alberghi G. L.;Bellagamba L.;Bindi M.;Boscherini D.;Cabras G.;Caforio D.;De Castro S.;Di Sipio R.;Fabbri F.;Fabbri L.;Franchini M.;Gabrielli A.;Giacobbe B.;Lasagni Manghi F.;Macchiolo A.;Massa L.;Mengarelli A.;Monzani S.;Polini A.;Rinaldi L.;Romano M.;Sbarra C.;Sbrizzi A.;Semprini-Cesari N.;Sioli M.;Todome K.;Ucchielli G.;Valentinetti S.;Villa M.;Vittori C.;Vivarelli I.;Zoccoli A.;
2019

Abstract

A measurement of production cross sections of the Higgs boson in proton-proton collisions is presented in the đ»â†’đœâąđœ decay channel. The analysis is performed using 36.1  fb−1 of data recorded by the ATLAS experiment at the Large Hadron Collider at a center-of-mass energy of √𝑠=13  TeV. All combinations of leptonic (𝜏→ℓⁱ𝑣ⁱ ÂŻ 𝑣 with ℓ=𝑒,𝜇) and hadronic (𝜏→hadrons 𝑣) 𝜏 decays are considered. The đ»â†’đœâąđœ signal over the expected background from other Standard Model processes is established with an observed (expected) significance of 4.4 (4.1) standard deviations. Combined with results obtained using data taken at 7 and 8 TeV center-of-mass energies, the observed (expected) significance amounts to 6.4 (5.4) standard deviations and constitutes an observation of đ»â†’đœâąđœ decays. Using the data taken at √𝑠=13  TeV, the total cross section in the đ»â†’đœâąđœ decay channel is measured to be 3.7⁹7+0.60 −0.59 (stat)ⁱ +0.87 −0.74 (syst)  pb, for a Higgs boson of mass 125 GeV assuming the relative contributions of its production modes as predicted by the Standard Model. Total cross sections in the đ»â†’đœâąđœ decay channel are determined separately for vector-boson-fusion production and gluon-gluon-fusion production to be 𝜎VBF đ»â†’đœâąđœ=0.28±0.09 (stat)ⁱ +0.11 −0.09 (syst)  pb and 𝜎𝑔ⁱ𝑔ⁱF đ»â†’đœâąđœ=3.1±1.0 (stat)ⁱ +1.6 −1.3 (syst)  pb, respectively. Similarly, results of a fit are reported in the framework of simplified template cross sections. All measurements are in agreement with Standard Model expectations.
2019
Aaboud M., A.G. (2019). Cross-section measurements of the Higgs boson decaying into a pair of ��-leptons in proton-proton collisions at √��=13  TeV with the ATLAS detector. PHYSICAL REVIEW D, 99(7), 072001-1-072001-39 [10.1103/PhysRevD.99.072001].
Aaboud M., Aad G., Abbott B., Abdinov O., Abeloos B., Abhayasinghe D.K., Abidi S.H., Abouzeid O.S., Abraham N.L., Abramowicz H., Abreu H., Abulaiti Y....espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/706063
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