Top-quark pair production in association with two b-jets is computed at next-to-leading order QCD precision, including effects of the b-quark mass, and matched to a   <math> <mi>t</mi> <mover> <mi>t</mi> <mo>¯</mo> </mover> </math>  $$ t\overline{t} $$ +jets simulation in a variable flavor number scheme. The Monte Carlo realization of this method, called fusing, consistently embeds the four-flavor calculation in a particle-level event generator. As a first phenomenological application, we present observables relevant to the data-driven estimation of irreducible backgrounds to   <math> <mi>t</mi> <mover> <mi>t</mi> <mo>¯</mo> </mover> <mi>H</mi> </math>  $$ t\overline{t}H $$ -production.

Germany

Lars Ferencz

United States

Stefan Höche

Judith Katzy

Frank Siegert

<math> <mi>t</mi> <mover> <mi>t</mi> <mo>¯</mo> </mover> <mi>b</mi> <mover> <mi>b</mi> <mo>¯</mo> </mover> </math>  $$ t\overline{t}b\overline{b} $$  at NLO precision in a variable flavor number scheme

$${\mathcal {C}}{\mathcal {P}}$$  <math> <mrow> <mi>C</mi> <mi>P</mi> </mrow> </math>   violation in the Higgs couplings to fermions is an intriguing, but not yet extensively explored possibility. We use inclusive and differential LHC Higgs boson measurements to fit the  $${\mathcal {C}}{\mathcal {P}}$$  <math> <mrow> <mi>C</mi> <mi>P</mi> </mrow> </math>   structure of the Higgs Yukawa couplings. Starting with simple effective models featuring  $${\mathcal {C}}{\mathcal {P}}$$  <math> <mrow> <mi>C</mi> <mi>P</mi> </mrow> </math>   violation in a single Higgs–fermion coupling, we probe well-motivated models with up to nine free parameters. We also investigate the complementarity of LHC constraints with the electron electric dipole moment bound, taking into account the possibility of a modified electron Yukawa coupling, and assess to which extent  $${\mathcal {C}}{\mathcal {P}}$$  <math> <mrow> <mi>C</mi> <mi>P</mi> </mrow> </math>   violation in the Higgs–fermion couplings can contribute to the observed baryon asymmetry of the universe. Even after including the recent analysis of angular correlations in  $$H\rightarrow \tau ^+\tau ^-$$  <math> <mrow> <mi>H</mi> <mo>→</mo> <msup> <mi>τ</mi> <mo>+</mo> </msup> <msup> <mi>τ</mi> <mo>-</mo> </msup> </mrow> </math>   decays, we find that a complex tau Yukawa coupling alone may be able to account for the observed baryon asymmetry, but with large uncertainties in the baryogenesis calculation. A combination of complex top and bottom quark Yukawa couplings yields a result four times larger than the sum of their separate contributions, but remains insufficient to account for the observed baryon asymmetry.

Henning Bahl

CERN

Elina Fuchs

Spain

Sven Heinemeyer

Marco Menen

Krisztian Peters

France

Matthias Saimpert

Georg Weiglein

Constraining the  $${\mathcal {C}}{\mathcal {P}}$$  <math> <mrow> <mi>C</mi> <mi>P</mi> </mrow> </math>   structure of Higgs-fermion couplings with a global LHC fit, the electron EDM and baryogenesis

The   <math> <mi>CP</mi> </math>  $$ \mathcal{CP} $$  structure of the Higgs boson in its coupling to the particles of the Standard Model is amongst the most important Higgs boson properties which have not yet been constrained with high precision. In this study, all relevant inclusive and differential Higgs boson measurements from the ATLAS and CMS experiments are used to constrain the   <math> <mi>CP</mi> </math>  $$ \mathcal{CP} $$ -nature of the top-Yukawa interaction. The model dependence of the constraints is studied by successively allowing for new physics contributions to the couplings of the Higgs boson to massive vector bosons, to photons, and to gluons. In the most general case, we find that the current data still permits a significant   <math> <mi>CP</mi> </math>  $$ \mathcal{CP} $$ -odd component in the top-Yukawa coupling. Furthermore, we explore the prospects to further constrain the   <math> <mi>CP</mi> </math>  $$ \mathcal{CP} $$  properties of this coupling with future LHC data by determining tH production rates independently from possible accompanying variations of the   <math> <mi>t</mi> <mover> <mi>t</mi> <mo>¯</mo> </mover> <mi>H</mi> </math>  $$ t\overline{t}H $$  rate. This is achieved via a careful selection of discriminating observables. At the HL-LHC, we find that evidence for tH production at the Standard Model rate can be achieved in the Higgs to diphoton decay channel alone.

Philip Bechtle

Tobias Klingl

Tim Stefaniak

Indirect   <math> <mi>CP</mi> </math>  $$ \mathcal{CP} $$  probes of the Higgs-top-quark interaction: current LHC constraints and future opportunities

The prompt and non-prompt production cross-sections for ψ (2S) mesons are measured using 2.1 fb −1 of pp collision data at a centre-of-mass energy of 7 TeV recorded by the ATLAS experiment at the LHC. The measurement exploits the ψ (2S) → J/ψ (→ μ + μ − ) π + π − decay mode, and probes ψ (2S) mesons with transverse momenta in the range 10 ≤ p T &lt; 100 GeV and rapidity | y | &lt; 2 . 0. The results are compared to other measurements of ψ (2S) production at the LHC and to various theoretical models for prompt and non-prompt quarkonium production.

Georges Aad

Brad Abbott

China

Jalal Abdallah

Samah Abdel Khalek

Azerbaijan

Ovsat Abdinov

Netherlands

Rosemarie Aben

Babak Abi

Maris Abolins

Canada

Ossama AbouZeid

Israel

Halina Abramowicz

Henso Abreu

Ricardo Abreu

Sweden

Yiming Abulaiti

United Kingdom

Bobby Samir Acharya

Poland

Leszek Adamczyk

David Adams

Jahred Adelman

Stefanie Adomeit

Tim Adye

Montenegro

Tatjana Agatonovic-Jovin

Juan Antonio Aguilar-Saavedra

Switzerland

Marco Agustoni

Steven Ahlen

Faig Ahmadov

Italy

Giulio Aielli

Henrik Akerstedt

Torsten Paul Ake Åkesson

Japan

Ginga Akimoto

Russia

Andrei Akimov

Gian Luigi Alberghi

Justin Albert

Solveig Albrand

Argentina

Maria Josefina Alconada Verzini

Martin Aleksa

Igor Aleksandrov

Romania

Calin Alexa

Gideon Alexander

Gauthier Alexandre

Greece

Theodoros Alexopoulos

Muhammad Alhroob

Gianluca Alimonti

Lion Alio

John Alison

Benedict Allbrooke

Lee John Allison

Phillip Allport

John Almond

Alberto Aloisio

Denmark

Alejandro Alonso

Francisco Alonso

Cristiano Alpigiani

Andrew David Altheimer

Barbara Alvarez Gonzalez

Mariagrazia Alviggi

Katsuya Amako

Brazil

Yara Amaral Coutinho

Christoph Amelung

Dante Amidei

Portugal

Susana Patricia Amor Dos Santos

Antonio Amorim

Simone Amoroso

Nir Amram

Glenn Amundsen

Christos Anastopoulos

Lucian Stefan Ancu

Nansi Andari

Timothy Andeen

Christoph Falk Anders

Gabriel Anders

Kelby Anderson

Attilio Andreazza

George Victor Andrei

Xabier Anduaga

Stylianos Angelidakis

Ivan Angelozzi

Philipp Anger

Aaron Angerami

Francis Anghinolfi

Alexey Anisenkov

Nuno Anjos

Alberto Annovi

Ariadni Antonaki

Mario Antonelli

Alexey Antonov

Slovakia

Jaroslav Antos

Fabio Anulli

Masato Aoki

Ludovica Aperio Bella

Rudi Apolle

Giorgi Arabidze

Ignacio Aracena

Yasuo Arai

Juan Pedro Araque

Ayana Arce

Jean-Francois Arguin

Spyridon Argyropoulos

Türkiye

Metin Arik

Aaron James Armbruster

Olivier Arnaez

Vanessa Arnal

Measurement of the production cross-section of ψ (2S) → J/ψ (→ μ + μ − ) π + π − in pp collisions at s $$ \sqrt{s} $$ = 7 TeV at ATLAS