Measurement of the Higgs boson width and evidence of its off-shell contributions to ZZ production

The CMS collaboration
Nature Phys. 18 (2022) 1329-1334, 2022.

Abstract
Since the discovery of the Higgs boson in 2012, detailed studies of its properties have been ongoing. Besides its mass, its width - related to its lifetime - is an important parameter. One way to determine this quantity is by measuring its off-shell production, where the Higgs boson mass is far away from its nominal value, and relating it to its on-shell production, where the mass is close to the nominal value. Here, we report evidence for such off-shell contributions to the production cross section of two Z bosons with data from the CMS experiment at the CERN Large Hadron Collider. We constrain the total rate of the off-shell Higgs boson contribution beyond the Z boson pair production threshold, relative to its standard model expectation, to the interval [0.0061, 2.0] at 95% confidence level. The scenario with no off-shell contribution is excluded at a $p$-value of 0.0003 (3.6 standard deviations). We measure the width of the Higgs boson as $\Gamma_{\mathrm{H}}$ = 3.2 $_{-1.7}^{+2.4}$ MeV, in agreement with the standard model expectation of 4.1 MeV. In addition, we set constraints on anomalous Higgs boson couplings to W and Z boson pairs.

  • GGsm vs -2dNLL (SM-like (f_{ai}=0) observed)

    Table from CMS-HIG-21-013

    10.17182/hepdata.127288.v1/t1

    GGsm vs -2dNLL (SM-like (f_{ai}=0) observed)

  • GGsm vs -2dNLL (f_{a2} (u) observed)

    Table from CMS-HIG-21-013

    10.17182/hepdata.127288.v1/t2

    GGsm vs -2dNLL (f_{a2} (u) observed)

  • GGsm vs -2dNLL (f_{a3} (u) observed)

    Table from CMS-HIG-21-013

    10.17182/hepdata.127288.v1/t3

    GGsm vs -2dNLL (f_{a3} (u) observed)

  • GGsm vs -2dNLL (f_{#Lambda1} (u) observed)

    Table from CMS-HIG-21-013

    10.17182/hepdata.127288.v1/t4

    GGsm vs -2dNLL (f_{#Lambda1} (u) observed)

  • GGsm vs -2dNLL (SM-like (f_{ai}=0) expected)

    Table from CMS-HIG-21-013

    10.17182/hepdata.127288.v1/t5

    GGsm vs -2dNLL (SM-like (f_{ai}=0) expected)

  • GGsm vs -2dNLL (f_{a2} (u) expected)

    Table from CMS-HIG-21-013

    10.17182/hepdata.127288.v1/t6

    GGsm vs -2dNLL (f_{a2} (u) expected)

  • GGsm vs -2dNLL (f_{a3} (u) expected)

    Table from CMS-HIG-21-013

    10.17182/hepdata.127288.v1/t7

    GGsm vs -2dNLL (f_{a3} (u) expected)

  • GGsm vs -2dNLL (f_{#Lambda1} (u) expected)

    Table from CMS-HIG-21-013

    10.17182/hepdata.127288.v1/t8

    GGsm vs -2dNLL (f_{#Lambda1} (u) expected)

  • GGsm vs -2dNLL (2l2#nu off-shell + 4l on-shell observed)

    Table from CMS-HIG-21-013

    10.17182/hepdata.127288.v1/t9

    GGsm vs -2dNLL (2l2#nu off-shell + 4l on-shell observed)

  • GGsm vs -2dNLL (4l off-shell + 4l on-shell observed)

    Table from CMS-HIG-21-013

    10.17182/hepdata.127288.v1/t10

    GGsm vs -2dNLL (4l off-shell + 4l on-shell observed)

  • GGsm vs -2dNLL (2l2#nu off-shell + 4l on-shell expected)

    Table from CMS-HIG-21-013

    10.17182/hepdata.127288.v1/t11

    GGsm vs -2dNLL (2l2#nu off-shell + 4l on-shell expected)

  • GGsm vs -2dNLL (4l off-shell + 4l on-shell expected)

    Table from CMS-HIG-21-013

    10.17182/hepdata.127288.v1/t12

    GGsm vs -2dNLL (4l off-shell + 4l on-shell expected)

  • r_offshell vs -2dNLL (R_{V,F}^{off-shell}=1 observed)

    Table from CMS-HIG-21-013

    10.17182/hepdata.127288.v1/t13

    r_offshell vs -2dNLL (R_{V,F}^{off-shell}=1 observed)

  • r_offshell vs -2dNLL (R_{V,F}^{off-shell} (u) observed)

    Table from CMS-HIG-21-013

    10.17182/hepdata.127288.v1/t14

    r_offshell vs -2dNLL (R_{V,F}^{off-shell} (u) observed)

  • r_offshell vs -2dNLL (R_{V,F}^{off-shell}=1 (2l2#nu) observed)

    Table from CMS-HIG-21-013

    10.17182/hepdata.127288.v1/t15

    r_offshell vs -2dNLL (R_{V,F}^{off-shell}=1 (2l2#nu) observed)

  • r_offshell vs -2dNLL (R_{V,F}^{off-shell} (u, 2l2#nu) observed)

    Table from CMS-HIG-21-013

    10.17182/hepdata.127288.v1/t16

    r_offshell vs -2dNLL (R_{V,F}^{off-shell} (u, 2l2#nu) observed)

  • r_offshell vs -2dNLL (R_{V,F}^{off-shell}=1 expected)

    Table from CMS-HIG-21-013

    10.17182/hepdata.127288.v1/t17

    r_offshell vs -2dNLL (R_{V,F}^{off-shell}=1 expected)

  • r_offshell vs -2dNLL (R_{V,F}^{off-shell} (u) expected)

    Table from CMS-HIG-21-013

    10.17182/hepdata.127288.v1/t18

    r_offshell vs -2dNLL (R_{V,F}^{off-shell} (u) expected)

  • r_offshell vs -2dNLL (R_{V,F}^{off-shell}=1 (2l2#nu) expected)

    Table from CMS-HIG-21-013

    10.17182/hepdata.127288.v1/t19

    r_offshell vs -2dNLL (R_{V,F}^{off-shell}=1 (2l2#nu) expected)

  • r_offshell vs -2dNLL (R_{V,F}^{off-shell} (u, 2l2#nu) expected)

    Table from CMS-HIG-21-013

    10.17182/hepdata.127288.v1/t20

    r_offshell vs -2dNLL (R_{V,F}^{off-shell} (u, 2l2#nu) expected)

  • rf_offshell vs -2dNLL (2l2#nu+4l observed)

    Table from CMS-HIG-21-013

    10.17182/hepdata.127288.v1/t21

    rf_offshell vs -2dNLL (2l2#nu+4l observed)

  • rf_offshell vs -2dNLL (Only 2l2#nu observed)

    Table from CMS-HIG-21-013

    10.17182/hepdata.127288.v1/t22

    rf_offshell vs -2dNLL (Only 2l2#nu observed)

  • rf_offshell vs -2dNLL (2l2#nu+4l expected)

    Table from CMS-HIG-21-013

    10.17182/hepdata.127288.v1/t23

    rf_offshell vs -2dNLL (2l2#nu+4l expected)

  • rf_offshell vs -2dNLL (Only 2l2#nu expected)

    Table from CMS-HIG-21-013

    10.17182/hepdata.127288.v1/t24

    rf_offshell vs -2dNLL (Only 2l2#nu expected)

  • rv_offshell vs -2dNLL (2l2#nu+4l observed)

    Table from CMS-HIG-21-013

    10.17182/hepdata.127288.v1/t25

    rv_offshell vs -2dNLL (2l2#nu+4l observed)

  • rv_offshell vs -2dNLL (Only 2l2#nu observed)

    Table from CMS-HIG-21-013

    10.17182/hepdata.127288.v1/t26

    rv_offshell vs -2dNLL (Only 2l2#nu observed)

  • rv_offshell vs -2dNLL (2l2#nu+4l expected)

    Table from CMS-HIG-21-013

    10.17182/hepdata.127288.v1/t27

    rv_offshell vs -2dNLL (2l2#nu+4l expected)

  • rv_offshell vs -2dNLL (Only 2l2#nu expected)

    Table from CMS-HIG-21-013

    10.17182/hepdata.127288.v1/t28

    rv_offshell vs -2dNLL (Only 2l2#nu expected)

  • rf_offshell vs rv_offshell observed

    Table from CMS-HIG-21-013

    10.17182/hepdata.127288.v1/t29

    rf_offshell vs rv_offshell observed

  • fa2 vs -2dNLL (#Gamma_{H}=4.1 MeV observed)

    Table from CMS-HIG-21-013

    10.17182/hepdata.127288.v1/t30

    fa2 vs -2dNLL (#Gamma_{H}=4.1 MeV observed)

  • fa2 vs -2dNLL (#Gamma_{H} (u) observed)

    Table from CMS-HIG-21-013

    10.17182/hepdata.127288.v1/t31

    fa2 vs -2dNLL (#Gamma_{H} (u) observed)

  • fa2 vs -2dNLL (On-shell 4l observed)

    Table from CMS-HIG-21-013

    10.17182/hepdata.127288.v1/t32

    fa2 vs -2dNLL (On-shell 4l observed)

  • fa2 vs -2dNLL (#Gamma_{H}=4.1 MeV expected)

    Table from CMS-HIG-21-013

    10.17182/hepdata.127288.v1/t33

    fa2 vs -2dNLL (#Gamma_{H}=4.1 MeV expected)

  • fa2 vs -2dNLL (#Gamma_{H} (u) expected)

    Table from CMS-HIG-21-013

    10.17182/hepdata.127288.v1/t34

    fa2 vs -2dNLL (#Gamma_{H} (u) expected)

  • fa2 vs -2dNLL (On-shell 4l expected)

    Table from CMS-HIG-21-013

    10.17182/hepdata.127288.v1/t35

    fa2 vs -2dNLL (On-shell 4l expected)

  • fa3 vs -2dNLL (#Gamma_{H}=4.1 MeV observed)

    Table from CMS-HIG-21-013

    10.17182/hepdata.127288.v1/t36

    fa3 vs -2dNLL (#Gamma_{H}=4.1 MeV observed)

  • fa3 vs -2dNLL (#Gamma_{H} (u) observed)

    Table from CMS-HIG-21-013

    10.17182/hepdata.127288.v1/t37

    fa3 vs -2dNLL (#Gamma_{H} (u) observed)

  • fa3 vs -2dNLL (On-shell 4l observed)

    Table from CMS-HIG-21-013

    10.17182/hepdata.127288.v1/t38

    fa3 vs -2dNLL (On-shell 4l observed)

  • fa3 vs -2dNLL (#Gamma_{H}=4.1 MeV expected)

    Table from CMS-HIG-21-013

    10.17182/hepdata.127288.v1/t39

    fa3 vs -2dNLL (#Gamma_{H}=4.1 MeV expected)

  • fa3 vs -2dNLL (#Gamma_{H} (u) expected)

    Table from CMS-HIG-21-013

    10.17182/hepdata.127288.v1/t40

    fa3 vs -2dNLL (#Gamma_{H} (u) expected)

  • fa3 vs -2dNLL (On-shell 4l expected)

    Table from CMS-HIG-21-013

    10.17182/hepdata.127288.v1/t41

    fa3 vs -2dNLL (On-shell 4l expected)

  • fL1 vs -2dNLL (#Gamma_{H}=4.1 MeV observed)

    Table from CMS-HIG-21-013

    10.17182/hepdata.127288.v1/t42

    fL1 vs -2dNLL (#Gamma_{H}=4.1 MeV observed)

  • fL1 vs -2dNLL (#Gamma_{H} (u) observed)

    Table from CMS-HIG-21-013

    10.17182/hepdata.127288.v1/t43

    fL1 vs -2dNLL (#Gamma_{H} (u) observed)

  • fL1 vs -2dNLL (On-shell 4l observed)

    Table from CMS-HIG-21-013

    10.17182/hepdata.127288.v1/t44

    fL1 vs -2dNLL (On-shell 4l observed)

  • fL1 vs -2dNLL (#Gamma_{H}=4.1 MeV expected)

    Table from CMS-HIG-21-013

    10.17182/hepdata.127288.v1/t45

    fL1 vs -2dNLL (#Gamma_{H}=4.1 MeV expected)

  • fL1 vs -2dNLL (#Gamma_{H} (u) expected)

    Table from CMS-HIG-21-013

    10.17182/hepdata.127288.v1/t46

    fL1 vs -2dNLL (#Gamma_{H} (u) expected)

  • fL1 vs -2dNLL (On-shell 4l expected)

    Table from CMS-HIG-21-013

    10.17182/hepdata.127288.v1/t47

    fL1 vs -2dNLL (On-shell 4l expected)

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