Observation of $\gamma\gamma\to\tau\tau$ in proton-proton collisions and limits on the anomalous electromagnetic moments of the $\tau$ lepton

The CMS collaboration
CMS-SMP-23-005, 2024.

Abstract (data abstract)
The photon-induced production of a pair of $\tau$ leptons, $\gamma\gamma\to\tau\tau$, is observed for the first time in proton-proton collisions. The observation is based on a data set recorded with the CMS detector at the LHC at a center-of-mass energy of $13~\mathrm{TeV}$ and corresponding to an integrated luminosity of $138~\mathrm{fb}^{-1}$. Events with a small number of tracks close to the di-$\tau$ vertex are selected to isolate photon-induced processes. Limits on the anomalous electromagnetic moments of the $\tau$ lepton originating from potential new physics effects on the $\gamma\tau\tau$ vertex are also set.

  • Figure 3: Number of pileup tracks

    Data from Figure 3, located on page 8.

    10.17182/hepdata.152621.v1/t1

    Normalized distributions of $N_\mathrm{tracks}^\mathrm{PU}$ in windows of 0.1 cm width along the $z$ axis using a sample of $\mu\mu$ events...

  • Figure 4: Number of HS tracks

    Data from Figure 4, located on page 10.

    10.17182/hepdata.152621.v1/t2

    Normalized distributions of of the number of reconstructed tracks ($N_\mathrm{tracks}$) in a 0.1 cm wide window in the $z$ direction,...

  • Figure 5: Rescaling of elasic-elastic contribution

    Data from Figure 5, located on page 11.

    10.17182/hepdata.152621.v1/t3

    Distributions of $m_{\mu\mu}$ in the $\mu\mu$ channel of the $N_\mathrm{tracks}=0$ and 1 categories with acoplanarity $A<0.015$, and for the combined...

  • Figure 7a: Corrections to jet mis-ID

    Data from Figure 7a.

    10.17182/hepdata.152621.v1/t4

    Multiplicative $N_\mathrm{tracks}$-dependent corrections to the $\tau_\mathrm{h}$ MFs, in the $\mathrm{e}\tau_\mathrm{h}$ final state in the high-$m_\mathrm{T}$ CR, for the $h^{\pm} +...

  • Figure 7b: Corrections to the $\tau_\mathrm{h}$ MFs

    Data from Figure 7b.

    10.17182/hepdata.152621.v1/t5

    Multiplicative $N_\mathrm{tracks}$-dependent corrections to the $\tau_\mathrm{h}$ MFs, in the $\mathrm{e}\tau_\mathrm{h}$ final state in the SS CR, for the $h^{\pm} +...

  • Figure 9a: Postfit $m_\mathrm{vis}$ distribution in emu

    Data from Figure 9 (upper left).

    10.17182/hepdata.152621.v1/t6

    Observed and predicted $m_\mathrm{vis}$ distributions in the $\mathrm{e}\mu$ final state for events with $N_\mathrm{tracks} = 0$. The normalization of the...

  • Figure 9b: Postfit $m_\mathrm{vis}$ distribution in etau

    Data from Figure 9 (upper right).

    10.17182/hepdata.152621.v1/t7

    Observed and predicted $m_\mathrm{vis}$ distributions in the $\mathrm{e}\tau_\mathrm{h}$ final state for events with $N_\mathrm{tracks} = 0$. The normalization of the...

  • Figure 9c: Postfit $m_\mathrm{vis}$ distribution in mutau

    Data from Figure 9 (lower left).

    10.17182/hepdata.152621.v1/t8

    Observed and predicted $m_\mathrm{vis}$ distributions in the $\mu\tau_\mathrm{h}$ final state for events with $N_\mathrm{tracks} = 0$. The normalization of the...

  • Figure 9d: Postfit $m_\mathrm{vis}$ distribution in tautau

    Data from Figure 9 (lower right).

    10.17182/hepdata.152621.v1/t9

    Observed and predicted $m_\mathrm{vis}$ distributions in the $\tau_\mathrm{h}\tau_\mathrm{h}$ final state for events with $N_\mathrm{tracks} = 0$. The normalization of the...

  • Figure 10a: Postfit $m_\mathrm{vis}$ distribution in emu

    Data from Figure 10 (upper left).

    10.17182/hepdata.152621.v1/t10

    Observed and predicted $m_\mathrm{vis}$ distributions in the $\mathrm{e}\mu$ final state for events with $N_\mathrm{tracks} = 1$. The normalization of the...

  • Figure 10b: Postfit $m_\mathrm{vis}$ distribution in etau

    Data from Figure 10 (upper right).

    10.17182/hepdata.152621.v1/t11

    Observed and predicted $m_\mathrm{vis}$ distributions in the $\mathrm{e}\tau_\mathrm{h}$ final state for events with $N_\mathrm{tracks} = 1$. The normalization of the...

  • Figure 10c: Postfit $m_\mathrm{vis}$ distribution in mutau

    Data from Figure 10 (lower left).

    10.17182/hepdata.152621.v1/t12

    Observed and predicted $m_\mathrm{vis}$ distributions in the $\mu\tau_\mathrm{h}$ final state for events with $N_\mathrm{tracks} = 1$. The normalization of the...

  • Figure 10d: Postfit $m_\mathrm{vis}$ distribution in tautau

    Data from Figure 10 (lower right).

    10.17182/hepdata.152621.v1/t13

    Observed and predicted $m_\mathrm{vis}$ distributions in the $\tau_\mathrm{h}\tau_\mathrm{h}$ final state for events with $N_\mathrm{tracks} = 1$. The normalization of the...

  • Figure 11: Postfit $N_\mathrm{tracks}$ distribution

    Data from Figure 11.

    10.17182/hepdata.152621.v1/t14

    Observed and predicted $N_\mathrm{tracks}$ distributions for events passing the SR selection but with the relaxed requirement $N_\mathrm{tracks} < 10$ and...

  • Figure 12a: Likelihood profiled in $a_{\tau}$

    Data from Figure 12a.

    10.17182/hepdata.152621.v1/t15

    Expected and observed negative log-likelihood scans as a function of $a_{\tau}$, for the combination of all SRs in all data-taking...

  • Figure 12b: Likelihood profiled in $d_{\tau}$

    Data from Figure 12b.

    10.17182/hepdata.152621.v1/t16

    Expected and observed negative log-likelihood scans as a function of $d_{\tau}$, for the combination of all SRs in all data-taking...

  • Figure 14a: Constraints on real part Wilson coefficients

    Data from Figure 14a.

    10.17182/hepdata.152621.v1/t17

    Expected and observed 95% CL constraints on the real part of the Wilson coefficients $C_{\tau B}$ and $C_{\tau W}$ divided...

  • Figure 14b: Constraints on imaginary part Wilson coefficients

    Data from Figure 14b.

    10.17182/hepdata.152621.v1/t18

    Expected and observed 95% CL constraints on the imaginary part of the Wilson coefficients $C_{\tau B}$ and $C_{\tau W}$ divided...

  • Supplementary Figure 1: Pileup track corrections

    Data from Supplementary Figure 1.

    10.17182/hepdata.152621.v1/t19

    Event weights applied to simulations in the 2016 (pre-VFP) data-taking period as a function of the dilepton vertex position along...

  • Supplementary Figure 2: Pileup track corrections

    Data from Supplementary Figure 2.

    10.17182/hepdata.152621.v1/t20

    Event weights applied to simulations in the 2016 (post-VFP) data-taking period as a function of the dilepton vertex position along...

  • Supplementary Figure 3: Pileup track corrections

    Data from Supplementary Figure 3.

    10.17182/hepdata.152621.v1/t21

    Event weights applied to simulations in the 2017 data-taking period as a function of the dilepton vertex position along the...

  • Supplementary Figure 4: Pileup track corrections

    Data from Supplementary Figure 4.

    10.17182/hepdata.152621.v1/t22

    Event weights applied to simulations in the 2018 data-taking period as a function of the dilepton vertex position along the...

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