Search for new resonances decaying to pairs of merged diphotons in proton-proton collisions at $\sqrt{s}$ = 13 TeV

The CMS collaboration
CMS-EXO-22-022, 2024.

Abstract
A search is presented for an extended Higgs sector with two new particles, X and $\phi$, in the process X $\to$$\phi\phi$$\to$$(\gamma\gamma)(\gamma\gamma)$. Novel neural networks classify events with diphotons that are merged and determine the diphoton masses. The search uses LHC proton-proton collision data at $\sqrt{s}$ = 13 TeV collected with the CMS detector, corresponding to an integrated luminosity of 138 fb$^{-1}$. No evidence of such resonances is seen. Upper limits are set on the production cross section versus the resonance masses, representing the most sensitive search in this channel.

  • Differential Dicluster mass spectrum $0.44 < \alpha < 0.49$%

    Data from Figure 2

    10.17182/hepdata.146677.v1/t1

    Observed differential $m_{\Gamma\Gamma}$ mass spectrum for $0.44 < \alpha < 0.49$%, where $\alpha = m_\phi/m_X$. The cross-section is calculated by...

  • Differential Dicluster mass spectrum $0.3 < \alpha < 0.35$%

    Data from Supplemental Figure 11

    10.17182/hepdata.146677.v1/t2

    Observed differential $m_{\Gamma\Gamma}$ mass spectrum for 0.3$ < \alpha < $0.35%, where $\alpha = m_\phi/m_X$. The cross-section is calculated by...

  • Differential Dicluster mass spectrum $0.35 < \alpha < 0.4$%

    Data from Supplemental Figure 12

    10.17182/hepdata.146677.v1/t3

    Observed differential $m_{\Gamma\Gamma}$ mass spectrum for 0.35$ < \alpha < $0.4%, where $\alpha = m_\phi/m_X$. The cross-section is calculated by...

  • Differential Dicluster mass spectrum $0.4 < \alpha < 0.44$%

    Data from Supplemental Figure 13

    10.17182/hepdata.146677.v1/t4

    Observed differential $m_{\Gamma\Gamma}$ mass spectrum for 0.4$ < \alpha < $0.44%, where $\alpha = m_\phi/m_X$. The cross-section is calculated by...

  • Differential Dicluster mass spectrum $0.49 < \alpha < 0.55$%

    Data from Supplemental Figure 14

    10.17182/hepdata.146677.v1/t5

    Observed differential $m_{\Gamma\Gamma}$ mass spectrum for 0.49$ < \alpha < $0.55%, where $\alpha = m_\phi/m_X$. The cross-section is calculated by...

  • Differential Dicluster mass spectrum $0.55 < \alpha < 0.6$%

    Data from Supplemental Figure 15

    10.17182/hepdata.146677.v1/t6

    Observed differential $m_{\Gamma\Gamma}$ mass spectrum for 0.55$ < \alpha < $0.6%, where $\alpha = m_\phi/m_X$. The cross-section is calculated by...

  • Differential Dicluster mass spectrum $0.6 < \alpha < 0.7$%

    Data from Supplemental Figure 16

    10.17182/hepdata.146677.v1/t7

    Observed differential $m_{\Gamma\Gamma}$ mass spectrum for 0.6$ < \alpha < $0.7%, where $\alpha = m_\phi/m_X$. The cross-section is calculated by...

  • Differential Dicluster mass spectrum $0.7 < \alpha < 0.81$%

    Data from Supplemental Figure 17

    10.17182/hepdata.146677.v1/t8

    Observed differential $m_{\Gamma\Gamma}$ mass spectrum for 0.7$ < \alpha < $0.81%, where $\alpha = m_\phi/m_X$. The cross-section is calculated by...

  • Differential Dicluster mass spectrum $0.81 < \alpha < 3.0$%

    Data from Supplemental Figure 18

    10.17182/hepdata.146677.v1/t9

    Observed differential $m_{\Gamma\Gamma}$ mass spectrum for 0.81$ < \alpha < $3.0%, where $\alpha = m_\phi/m_X$. The cross-section is calculated by...

  • CL Limits

    Data from Figure 3 of paper and Supplemental Figure 20

    10.17182/hepdata.146677.v1/t10

    Two dimensional plot where the Z-axis is the observed (paper Fig. 3) or expected (Supp. Fig. 20) 95% CL upper...

  • CL Limits Exclusions (theory one ninth)

    Data from Figure 3, Exclusion Curves for $m_X N / f = 1/9$

    10.17182/hepdata.146677.v1/t11

    Expected exclusion limits for $m_X N / f = 1/9$ for signal cross sections for for the production of $X...

  • CL Limits Exclusions (theory one)

    Data from Figure 3, Exclusion Curves for $m_X N / f = 1$

    10.17182/hepdata.146677.v1/t12

    Expected exclusion limits for $m_X N / f = 1$ for signal cross sections for for the production of $X...

  • Cross Section Limits for $\alpha = 0.005$

    Data from Supplementary Figure 19

    10.17182/hepdata.146677.v1/t13

    The observed 95% CL upper limits on the product of the cross section, and branching fraction for the production of...

  • Cross Section Limits for $\alpha = 0.006$

    Data from Supplementary Figure 19

    10.17182/hepdata.146677.v1/t14

    The observed 95% CL upper limits on the product of the cross section, and branching fraction for the production of...

  • Cross Section Limits for $\alpha = 0.007$

    Data from Supplementary Figure 19

    10.17182/hepdata.146677.v1/t15

    The observed 95% CL upper limits on the product of the cross section, and branching fraction for the production of...

  • Cross Section Limits for $\alpha = 0.008$

    Data from Supplementary Figure 19

    10.17182/hepdata.146677.v1/t16

    The observed 95% CL upper limits on the product of the cross section, and branching fraction for the production of...

  • Cross Section Limits for $\alpha = 0.009$

    Data from Supplementary Figure 19

    10.17182/hepdata.146677.v1/t17

    The observed 95% CL upper limits on the product of the cross section, and branching fraction for the production of...

  • Cross Section Limits for $\alpha = 0.01$

    Data from Supplementary Figure 19

    10.17182/hepdata.146677.v1/t18

    The observed 95% CL upper limits on the product of the cross section, and branching fraction for the production of...

  • Cross Section Limits for $\alpha = 0.011$

    Data from Supplementary Figure 19

    10.17182/hepdata.146677.v1/t19

    The observed 95% CL upper limits on the product of the cross section, and branching fraction for the production of...

  • Cross Section Limits for $\alpha = 0.012$

    Data from Supplementary Figure 19

    10.17182/hepdata.146677.v1/t20

    The observed 95% CL upper limits on the product of the cross section, and branching fraction for the production of...

  • Cross Section Limits for $\alpha = 0.013$

    Data from Supplementary Figure 19

    10.17182/hepdata.146677.v1/t21

    The observed 95% CL upper limits on the product of the cross section, and branching fraction for the production of...

  • Cross Section Limits for $\alpha = 0.014$

    Data from Supplementary Figure 19

    10.17182/hepdata.146677.v1/t22

    The observed 95% CL upper limits on the product of the cross section, and branching fraction for the production of...

  • Cross Section Limits for $\alpha = 0.015$

    Data from Supplementary Figure 19

    10.17182/hepdata.146677.v1/t23

    The observed 95% CL upper limits on the product of the cross section, and branching fraction for the production of...

  • Cross Section Limits for $\alpha = 0.016$

    Data from Supplementary Figure 19

    10.17182/hepdata.146677.v1/t24

    The observed 95% CL upper limits on the product of the cross section, and branching fraction for the production of...

  • Cross Section Limits for $\alpha = 0.017$

    Data from Supplementary Figure 19

    10.17182/hepdata.146677.v1/t25

    The observed 95% CL upper limits on the product of the cross section, and branching fraction for the production of...

  • Cross Section Limits for $\alpha = 0.018$

    Data from Supplementary Figure 19

    10.17182/hepdata.146677.v1/t26

    The observed 95% CL upper limits on the product of the cross section, and branching fraction for the production of...

  • Cross Section Limits for $\alpha = 0.019$

    Data from Supplementary Figure 19

    10.17182/hepdata.146677.v1/t27

    The observed 95% CL upper limits on the product of the cross section, and branching fraction for the production of...

  • Cross Section Limits for $\alpha = 0.02$

    Data from Supplementary Figure 19

    10.17182/hepdata.146677.v1/t28

    The observed 95% CL upper limits on the product of the cross section, and branching fraction for the production of...

  • Cross Section Limits for $\alpha = 0.021$

    Data from Supplementary Figure 19

    10.17182/hepdata.146677.v1/t29

    The observed 95% CL upper limits on the product of the cross section, and branching fraction for the production of...

  • Cross Section Limits for $\alpha = 0.022$

    Data from Supplementary Figure 19

    10.17182/hepdata.146677.v1/t30

    The observed 95% CL upper limits on the product of the cross section, and branching fraction for the production of...

  • Cross Section Limits for $\alpha = 0.023$

    Data from Supplementary Figure 19

    10.17182/hepdata.146677.v1/t31

    The observed 95% CL upper limits on the product of the cross section, and branching fraction for the production of...

  • Cross Section Limits for $\alpha = 0.024$

    Data from Supplementary Figure 19

    10.17182/hepdata.146677.v1/t32

    The observed 95% CL upper limits on the product of the cross section, and branching fraction for the production of...

  • Cross Section Limits for $\alpha = 0.025$

    Data from Supplementary Figure 19

    10.17182/hepdata.146677.v1/t33

    The observed 95% CL upper limits on the product of the cross section, and branching fraction for the production of...

  • Signal Efficiencies

    Data from Supplementary Figure 9

    10.17182/hepdata.146677.v1/t34

    Signal fractional efficiencies

  • Local Significances

    Data from Supplementary Figure 21

    10.17182/hepdata.146677.v1/t35

    Local significance in units of standard deviations in the $(m_\phi/m_X) − m_X$ plane.

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