# Observation of the SM Higgs boson decaying to a pair of τ leptons with the CMS detector

- Institution: CERN
- Department: LHC Seminar
- Speaker: Jan Steggemann
- Year: 2017
- Language: English
- Source: [CERN](https://videos.cern.ch/record/3007609)
- Licence: [CERN](http://copyright.web.cern.ch)
- Who can watch: Teens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

A search for the standard model Higgs boson decaying into a pair of τ leptons is performed using events recorded in proton-proton collisions by the CMS experiment at the LHC in 2016. The data set corresponds to an integrated luminosity of 35.9 fb−1 at a center-of-mass energy of 13 TeV. The τ leptons decay semi-hadronically, or leptonically to an electron or a muon, and the four decay channels with the largest branching fractions are considered. An excess of events is observed over the expected background prediction with a significance of 4.9 standard deviations for a Higgs boson mass mH = 125 GeV, to be compared to an expected significance of 4.7 standard deviations. The best fit of the product of the observed H → ττ signal cross section and branching fraction for mH = 125 GeV is 1.09+0.27−0.26 times the standard model expectation. The combination with the search for decays of the Higgs boson into pairs of τ leptons performed with data collected by the CMS experiment at the LHC at center-of-mass energies of 7 and 8 TeV leads to an observed significance in excess of 5 standard deviations. .

0:00:00 Slide 1

0:01:32 Slide 2

0:02:38 Slide 3

0:03:58 Slide 4

0:04:23 Slide 5

0:04:44 Slide 6

0:06:37 Slide 7

0:07:54 Slide 8

0:08:55 Slide 9

0:10:16 Slide 10

0:12:33 Slide 11

0:13:47 Slide 12

0:14:29 Slide 13

0:16:14 Slide 14

0:18:13 Slide 15

0:19:14 Slide 16

0:19:59 Slide 17

0:20:42 Slide 18

0:21:54 Slide 19

0:22:09 Slide 20

0:22:39 Slide 21

0:23:31 Slide 22

0:24:39 Slide 23

0:26:10 Slide 24

0:26:54 Slide 25

0:27:38 Slide 26

0:28:09 Slide 27

0:30:19 Slide 28

0:30:29 Slide 29

0:31:25 Slide 30

0:32:09 Slide 31

0:33:10 Slide 32

0:33:46 Slide 33

0:35:30 Slide 34

0:37:10 Slide 35

0:38:14 Slide 36

0:38:46 Slide 37

0:39:00 Slide 38

0:39:05 Slide 39

0:39:15 Slide 40

0:39:24 Slide 41

0:39:42 Slide 42

0:40:08 Slide 43

0:41:09 Slide 44

0:41:35 Slide 45

0:41:42 Slide 46

0:43:01 Slide 47

0:44:00 Slide 48

0:44:59 Slide 49

0:45:52 Slide 50…

## Lectures

1. [Observation of the SM Higgs boson decaying to a pair of τ leptons with the CMS detector](https://invisiblenetwork.ai/learn/cern/3007609/6a84c5b0bb35), 1 h 1 min (CERN's player)