A study of the measurement of the $τ$ lepton anomalous magnetic moment in high energy lead-lead collisions at LHC
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| Format: | Preprint |
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2023
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| _version_ | 1866909077822504960 |
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| author | Verducci, Monica Vignaroli, Natascia Roda, Chiara Cavasinni, Vincenzo |
| author_facet | Verducci, Monica Vignaroli, Natascia Roda, Chiara Cavasinni, Vincenzo |
| contents | The $τ$ lepton anomalous magnetic moment: $a_τ= \frac{g_τ-2}{2}$ was measured, so far, with a precision of only several percents despite its highly sensitivity to physics beyond the Standard Model such as compositeness or Supersymmetry. A new study is presented to improve the sensitivity of the $a_τ$ measurement with photon-photon interactions from ultra-peripheral lead-lead collisions at LHC. The theoretical approach used in this work is based on an effective Lagrangian and on a photon flux implemented in the MadGraph5 Monte Carlo simulation. Using a multivariate analysis to discriminate the signal from the background processes, a sensitivity to the anomalous magnetic moment $\rm{a_τ}$ = 0 $_{+0.011} ^{-0.019}$ is obtained at 95\% CL with a dataset corresponding to an integrated luminosity of 2 nb$^{-1}$ of lead-lead collisions and assuming a conservative 10\% systematic uncertainty. The present results are compared with previous calculations and available measurements. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2307_15160 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | A study of the measurement of the $τ$ lepton anomalous magnetic moment in high energy lead-lead collisions at LHC Verducci, Monica Vignaroli, Natascia Roda, Chiara Cavasinni, Vincenzo High Energy Physics - Phenomenology High Energy Physics - Experiment The $τ$ lepton anomalous magnetic moment: $a_τ= \frac{g_τ-2}{2}$ was measured, so far, with a precision of only several percents despite its highly sensitivity to physics beyond the Standard Model such as compositeness or Supersymmetry. A new study is presented to improve the sensitivity of the $a_τ$ measurement with photon-photon interactions from ultra-peripheral lead-lead collisions at LHC. The theoretical approach used in this work is based on an effective Lagrangian and on a photon flux implemented in the MadGraph5 Monte Carlo simulation. Using a multivariate analysis to discriminate the signal from the background processes, a sensitivity to the anomalous magnetic moment $\rm{a_τ}$ = 0 $_{+0.011} ^{-0.019}$ is obtained at 95\% CL with a dataset corresponding to an integrated luminosity of 2 nb$^{-1}$ of lead-lead collisions and assuming a conservative 10\% systematic uncertainty. The present results are compared with previous calculations and available measurements. |
| title | A study of the measurement of the $τ$ lepton anomalous magnetic moment in high energy lead-lead collisions at LHC |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2307.15160 |