Higgs boson observation and measurements of its properties in the H→ZZ→4ℓ decay mode

Konstantinos Nikolopoulos; A Korytov

doi:10.1142/9789814425452_0005

Higgs boson observation and measurements of its properties in the H→ZZ→4ℓ decay mode

Konstantinos Nikolopoulos, A Korytov

Physics and Astronomy

Research output: Chapter in Book/Report/Conference proceeding › Chapter (peer-reviewed) › peer-review

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Abstract

In their searches for the Standard Model (SM) Higgs boson in the mass range 115-1000 GeV, both ATLAS and CMS Collaborations observed a narrow four-lepton resonance with a mass near 125 GeV with local significances in excess of 5?. In the combination of the ATLAS and CMS H→ZZ→4ℓ measurements, the mass of the observed boson was found to be 125.15 ± 0.37 (stat) ± 0.15 (syst) GeV. The event rates attributed to the signal and the studied differential cross sections were compatible with the SM Higgs boson hypothesis. Kinematic properties of leptons in signal candidate events agreed with those expected for a state with spinparity quantum numbers of the SM Higgs boson (J^P = 0⁺) and strongly disfavoured states with alternative quantum numbers or 0⁺ states with non-SM-like tensor structures of their couplings to Z bosons. The yield and kinematic properties of events in the high four-lepton mass region allowed one to probe off-shell production of the discovered boson and set model-dependent upper limits on its natural width.

Original language	English
Title of host publication	Discovery of the Higgs Boson
Editors	Aleandro Nisati, Vivek Sharma
Publisher	World Scientific
Pages	127-178
ISBN (Electronic)	978-9814425469
ISBN (Print)	978-9814425445 , 978-9814425872
DOIs	https://doi.org/10.1142/9789814425452_0005
Publication status	Published - Oct 2016

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title = "Higgs boson observation and measurements of its properties in the H→ZZ→4ℓ decay mode",

abstract = "In their searches for the Standard Model (SM) Higgs boson in the mass range 115-1000 GeV, both ATLAS and CMS Collaborations observed a narrow four-lepton resonance with a mass near 125 GeV with local significances in excess of 5?. In the combination of the ATLAS and CMS H→ZZ→4ℓ measurements, the mass of the observed boson was found to be 125.15 ± 0.37 (stat) ± 0.15 (syst) GeV. The event rates attributed to the signal and the studied differential cross sections were compatible with the SM Higgs boson hypothesis. Kinematic properties of leptons in signal candidate events agreed with those expected for a state with spinparity quantum numbers of the SM Higgs boson (JP = 0+) and strongly disfavoured states with alternative quantum numbers or 0+ states with non-SM-like tensor structures of their couplings to Z bosons. The yield and kinematic properties of events in the high four-lepton mass region allowed one to probe off-shell production of the discovered boson and set model-dependent upper limits on its natural width.",

author = "Konstantinos Nikolopoulos and A Korytov",

year = "2016",

month = oct,

doi = "10.1142/9789814425452_0005",

language = "English",

isbn = "978-9814425445 ",

pages = "127--178",

editor = "Aleandro Nisati and Vivek Sharma",

booktitle = "Discovery of the Higgs Boson",

publisher = "World Scientific",

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TY - CHAP

T1 - Higgs boson observation and measurements of its properties in the H→ZZ→4ℓ decay mode

AU - Nikolopoulos, Konstantinos

AU - Korytov, A

PY - 2016/10

Y1 - 2016/10

N2 - In their searches for the Standard Model (SM) Higgs boson in the mass range 115-1000 GeV, both ATLAS and CMS Collaborations observed a narrow four-lepton resonance with a mass near 125 GeV with local significances in excess of 5?. In the combination of the ATLAS and CMS H→ZZ→4ℓ measurements, the mass of the observed boson was found to be 125.15 ± 0.37 (stat) ± 0.15 (syst) GeV. The event rates attributed to the signal and the studied differential cross sections were compatible with the SM Higgs boson hypothesis. Kinematic properties of leptons in signal candidate events agreed with those expected for a state with spinparity quantum numbers of the SM Higgs boson (JP = 0+) and strongly disfavoured states with alternative quantum numbers or 0+ states with non-SM-like tensor structures of their couplings to Z bosons. The yield and kinematic properties of events in the high four-lepton mass region allowed one to probe off-shell production of the discovered boson and set model-dependent upper limits on its natural width.

AB - In their searches for the Standard Model (SM) Higgs boson in the mass range 115-1000 GeV, both ATLAS and CMS Collaborations observed a narrow four-lepton resonance with a mass near 125 GeV with local significances in excess of 5?. In the combination of the ATLAS and CMS H→ZZ→4ℓ measurements, the mass of the observed boson was found to be 125.15 ± 0.37 (stat) ± 0.15 (syst) GeV. The event rates attributed to the signal and the studied differential cross sections were compatible with the SM Higgs boson hypothesis. Kinematic properties of leptons in signal candidate events agreed with those expected for a state with spinparity quantum numbers of the SM Higgs boson (JP = 0+) and strongly disfavoured states with alternative quantum numbers or 0+ states with non-SM-like tensor structures of their couplings to Z bosons. The yield and kinematic properties of events in the high four-lepton mass region allowed one to probe off-shell production of the discovered boson and set model-dependent upper limits on its natural width.

U2 - 10.1142/9789814425452_0005

DO - 10.1142/9789814425452_0005

M3 - Chapter (peer-reviewed)

SN - 978-9814425445

SN - 978-9814425872

SP - 127

EP - 178

BT - Discovery of the Higgs Boson

A2 - Nisati, Aleandro

A2 - Sharma, Vivek

PB - World Scientific

ER -

Higgs boson observation and measurements of its properties in the H→ZZ→4ℓ decay mode

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