Tt̄ spin correlation at the LHC

C. Schwanenberger

doi:10.1393/ncc/i2012-11230-9

Tt̄ spin correlation at the LHC

C. Schwanenberger

Research output: Contribution to journal › Article › peer-review

Abstract

The ATLAS collaboration has performed a study of spin correlation in tt̄ production from proton-proton collisions at the Large Hadron Collier (LHC) at a centre-of-mass energy of 7 TeV using 0.70 fb-1 of data. Candidate events are selected in the dilepton topology with large missing transverse energy and at least two jets. The difference in azimuthal angle between the two charged leptons is compared to the expected distributions in the Standard Model, and to the case where the top quarks are produced with uncorrelated spin. Using the helicity basis as the quantisation axis, the strength of the spin correlation between the top and antitop quark is measured to be Ahelicity = 0.34+0.15-0.11, which is in agreement with the NLO Standard Model prediction. © CERN on behalf of the ATLAS Collaboration under CC BY-NC 3.0.

Original language	English
Pages (from-to)	115-118
Number of pages	3
Journal	Nuovo Cimento della Societa Italiana di Fisica C
Volume	35
Issue number	3
DOIs	https://doi.org/10.1393/ncc/i2012-11230-9
Publication status	Published - May 2012

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title = "T{\=t} spin correlation at the LHC",

abstract = "The ATLAS collaboration has performed a study of spin correlation in t{\=t} production from proton-proton collisions at the Large Hadron Collier (LHC) at a centre-of-mass energy of 7 TeV using 0.70 fb-1 of data. Candidate events are selected in the dilepton topology with large missing transverse energy and at least two jets. The difference in azimuthal angle between the two charged leptons is compared to the expected distributions in the Standard Model, and to the case where the top quarks are produced with uncorrelated spin. Using the helicity basis as the quantisation axis, the strength of the spin correlation between the top and antitop quark is measured to be Ahelicity = 0.34+0.15-0.11, which is in agreement with the NLO Standard Model prediction. {\textcopyright} CERN on behalf of the ATLAS Collaboration under CC BY-NC 3.0.",

author = "C. Schwanenberger",

year = "2012",

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doi = "10.1393/ncc/i2012-11230-9",

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journal = "Nuovo Cimento della Societa Italiana di Fisica C",

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publisher = "Societ{\`a} Italiana di Fisica",

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T1 - Tt̄ spin correlation at the LHC

AU - Schwanenberger, C.

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N2 - The ATLAS collaboration has performed a study of spin correlation in tt̄ production from proton-proton collisions at the Large Hadron Collier (LHC) at a centre-of-mass energy of 7 TeV using 0.70 fb-1 of data. Candidate events are selected in the dilepton topology with large missing transverse energy and at least two jets. The difference in azimuthal angle between the two charged leptons is compared to the expected distributions in the Standard Model, and to the case where the top quarks are produced with uncorrelated spin. Using the helicity basis as the quantisation axis, the strength of the spin correlation between the top and antitop quark is measured to be Ahelicity = 0.34+0.15-0.11, which is in agreement with the NLO Standard Model prediction. © CERN on behalf of the ATLAS Collaboration under CC BY-NC 3.0.

AB - The ATLAS collaboration has performed a study of spin correlation in tt̄ production from proton-proton collisions at the Large Hadron Collier (LHC) at a centre-of-mass energy of 7 TeV using 0.70 fb-1 of data. Candidate events are selected in the dilepton topology with large missing transverse energy and at least two jets. The difference in azimuthal angle between the two charged leptons is compared to the expected distributions in the Standard Model, and to the case where the top quarks are produced with uncorrelated spin. Using the helicity basis as the quantisation axis, the strength of the spin correlation between the top and antitop quark is measured to be Ahelicity = 0.34+0.15-0.11, which is in agreement with the NLO Standard Model prediction. © CERN on behalf of the ATLAS Collaboration under CC BY-NC 3.0.

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DO - 10.1393/ncc/i2012-11230-9

M3 - Article

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SP - 115

EP - 118

JO - Nuovo Cimento della Societa Italiana di Fisica C

JF - Nuovo Cimento della Societa Italiana di Fisica C

SN - 1124-1896

IS - 3

ER -

Tt̄ spin correlation at the LHC

Abstract

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