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The First Differential Cross Section Measurements of tt̄ Produced with a W Boson in pp Collisions.

Record Type:	Electronic resources : Monograph/item
Title/Author:	The First Differential Cross Section Measurements of tt̄ Produced with a W Boson in pp Collisions./
Author:	Bullard, Brendon Aurele.
Description:	1 online resource (255 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 84-01, Section: B.
Contained By:	Dissertations Abstracts International84-01B.
Subject:	Particle physics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29210518click for full text (PQDT)
ISBN:	9798834007692

The First Differential Cross Section Measurements of tt̄ Produced with a W Boson in pp Collisions.
Bullard, Brendon Aurele.

The First Differential Cross Section Measurements of tt̄ Produced with a W Boson in pp Collisions. - 1 online resource (255 pages)

Source: Dissertations Abstracts International, Volume: 84-01, Section: B.

Thesis (Ph.D.)--Harvard University, 2022.

Includes bibliographical references

Measurements of inclusive tt̄W± production cross sections performed by the ATLAS and CMS collaborations have consistently shown excesses of 20%-70% over theoretical predictions. These observations have lead to a growth in interest from the theory community over the last several years, leading to the realization that subleading electroweak corrections involving internal tW → tW scattering can be important for differential tt̄W production cross section calculations. This thesis presents the first differential cross section measurements of the tt̄W process using 138 fb-1 of pp collision data at √s = 13 TeV collected by the ATLAS experiment. Of particular interest is the Njets distribution, a key input for the measurement of tt̄H production in multi-lepton final states. Inclusive and differential cross sections are extracted at the particle level in ll and lll fiducial regions, both separated by total charge of the leptons as well as inclusively in charge with relative charge asymmetries. Charge-asymmetric enhancement in the tt̄W ll fiducial regions and charge-symmetric enhancement in the lll region are observed. Excesses in the tt̄W production cross section are localized to events with low jet multiplicity, high leptonic HT, and high di-lepton invariant mass. Distributions are generally in good agreement with predictions of several Monte Carlo models.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798834007692Subjects--Topical Terms:

3433269
Particle physics.
Subjects--Index Terms:

ATLASIndex Terms--Genre/Form:

542853
Electronic books.

The First Differential Cross Section Measurements of tt̄ Produced with a W Boson in pp Collisions.
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504 $a Includes bibliographical references
520 $a Measurements of inclusive tt̄W± production cross sections performed by the ATLAS and CMS collaborations have consistently shown excesses of 20%-70% over theoretical predictions. These observations have lead to a growth in interest from the theory community over the last several years, leading to the realization that subleading electroweak corrections involving internal tW → tW scattering can be important for differential tt̄W production cross section calculations. This thesis presents the first differential cross section measurements of the tt̄W process using 138 fb-1 of pp collision data at √s = 13 TeV collected by the ATLAS experiment. Of particular interest is the Njets distribution, a key input for the measurement of tt̄H production in multi-lepton final states. Inclusive and differential cross sections are extracted at the particle level in ll and lll fiducial regions, both separated by total charge of the leptons as well as inclusively in charge with relative charge asymmetries. Charge-asymmetric enhancement in the tt̄W ll fiducial regions and charge-symmetric enhancement in the lll region are observed. Excesses in the tt̄W production cross section are localized to events with low jet multiplicity, high leptonic HT, and high di-lepton invariant mass. Distributions are generally in good agreement with predictions of several Monte Carlo models.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2023
538 $a Mode of access: World Wide Web
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