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Improved reconstruction of highly boosted τ-lepton pairs in the ττ→(μνμντ)(hadrons+ντ) decay channels with the ATLAS detector.

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Title: Improved reconstruction of highly boosted τ-lepton pairs in the ττ→(μνμντ)(hadrons+ντ) decay channels with the ATLAS detector.
Authors: Aad, G.1 (AUTHOR), Aakvaag, E.2 (AUTHOR), Abbott, B.3 (AUTHOR), Abdelhameed, S.4 (AUTHOR), Abeling, K.5 (AUTHOR), Abicht, N.J.6 (AUTHOR), Abidi, S.H.7 (AUTHOR), Aboelela, M.8 (AUTHOR), Aboulhorma, A.9 (AUTHOR), Abramowicz, H.10 (AUTHOR), Abulaiti, Y.11 (AUTHOR), Acharya, B.S.12,13,14 (AUTHOR), Ackermann, A.15 (AUTHOR), Bourdarios, C. Adam16 (AUTHOR), Adamczyk, L.17 (AUTHOR), Addepalli, S. V.18 (AUTHOR), Addison, M. J.19 (AUTHOR), Adelman, J.20 (AUTHOR), Adiguzel, A.21 (AUTHOR), Adye, T.22 (AUTHOR)
Source: European Physical Journal C -- Particles & Fields. Jun2025, Vol. 85 Issue 6, p1-32. 32p.
Subjects: Large Hadron Collider, Hadron decay, Signal reconstruction, Neutrinos, Detectors, Muons
Abstract: This paper presents a new τ -lepton reconstruction and identification procedure at the ATLAS detector at the Large Hadron Collider, which leads to significantly improved performance in the case of physics processes where a highly boosted pair of τ -leptons is produced and one τ -lepton decays into a muon and two neutrinos ( τ μ ), and the other decays into hadrons and one neutrino ( τ had ). By removing the muon information from the signals used for reconstruction and identification of the τ had candidate in the boosted pair, the efficiency is raised to the level expected for an isolated τ had . The new procedure is validated by selecting a sample of highly boosted Z → τ μ τ had candidates from the data sample of 140 fb - 1 of proton–proton collisions at 13 TeV recorded with the ATLAS detector. Good agreement is found between data and simulation predictions in both the Z → τ μ τ had signal region and in a background validation region. The results presented in this paper demonstrate the effectiveness of the τ had reconstruction with muon removal in enhancing the signal sensitivity of the boosted τ μ τ had channel at the ATLAS detector. [ABSTRACT FROM AUTHOR]
Copyright of European Physical Journal C -- Particles & Fields is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Improved reconstruction of highly boosted τ-lepton pairs in the ττ→(μνμντ)(hadrons+ντ) decay channels with the ATLAS detector.
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  Data: <searchLink fieldCode="AR" term="%22Aad%2C+G%2E%22">Aad, G.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Aakvaag%2C+E%2E%22">Aakvaag, E.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Abbott%2C+B%2E%22">Abbott, B.</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Abdelhameed%2C+S%2E%22">Abdelhameed, S.</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Abeling%2C+K%2E%22">Abeling, K.</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Abicht%2C+N%2EJ%2E%22">Abicht, N.J.</searchLink><relatesTo>6</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Abidi%2C+S%2EH%2E%22">Abidi, S.H.</searchLink><relatesTo>7</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Aboelela%2C+M%2E%22">Aboelela, M.</searchLink><relatesTo>8</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Aboulhorma%2C+A%2E%22">Aboulhorma, A.</searchLink><relatesTo>9</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Abramowicz%2C+H%2E%22">Abramowicz, H.</searchLink><relatesTo>10</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Abulaiti%2C+Y%2E%22">Abulaiti, Y.</searchLink><relatesTo>11</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Acharya%2C+B%2ES%2E%22">Acharya, B.S.</searchLink><relatesTo>12,13,14</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ackermann%2C+A%2E%22">Ackermann, A.</searchLink><relatesTo>15</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Bourdarios%2C+C%2E+Adam%22">Bourdarios, C. Adam</searchLink><relatesTo>16</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Adamczyk%2C+L%2E%22">Adamczyk, L.</searchLink><relatesTo>17</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Addepalli%2C+S%2E+V%2E%22">Addepalli, S. V.</searchLink><relatesTo>18</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Addison%2C+M%2E+J%2E%22">Addison, M. J.</searchLink><relatesTo>19</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Adelman%2C+J%2E%22">Adelman, J.</searchLink><relatesTo>20</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Adiguzel%2C+A%2E%22">Adiguzel, A.</searchLink><relatesTo>21</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Adye%2C+T%2E%22">Adye, T.</searchLink><relatesTo>22</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22European+Physical+Journal+C+--+Particles+%26+Fields%22">European Physical Journal C -- Particles & Fields</searchLink>. Jun2025, Vol. 85 Issue 6, p1-32. 32p.
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  Data: This paper presents a new τ -lepton reconstruction and identification procedure at the ATLAS detector at the Large Hadron Collider, which leads to significantly improved performance in the case of physics processes where a highly boosted pair of τ -leptons is produced and one τ -lepton decays into a muon and two neutrinos ( τ μ ), and the other decays into hadrons and one neutrino ( τ had ). By removing the muon information from the signals used for reconstruction and identification of the τ had candidate in the boosted pair, the efficiency is raised to the level expected for an isolated τ had . The new procedure is validated by selecting a sample of highly boosted Z → τ μ τ had candidates from the data sample of 140 fb - 1 of proton–proton collisions at 13 TeV recorded with the ATLAS detector. Good agreement is found between data and simulation predictions in both the Z → τ μ τ had signal region and in a background validation region. The results presented in this paper demonstrate the effectiveness of the τ had reconstruction with muon removal in enhancing the signal sensitivity of the boosted τ μ τ had channel at the ATLAS detector. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of European Physical Journal C -- Particles & Fields is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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