First measurement of the top quark pair production cross section in proton-proton collisions at $$ \sqrt{s} $$ = 13.6 TeV

Abstract

The first measurement of the top quark pair ($$ \textrm{t}\overline{\textrm{t}} $$ t t ¯ ) production cross section in proton-proton collisions at $$ \sqrt{s} $$ s = 13.6 TeV is presented. Data recorded with the CMS detector at the CERN LHC in Summer 2022, corresponding to an integrated luminosity of 1.21 fb−1, are analyzed. Events are selected with one or two charged leptons (electrons or muons) and additional jets. A maximum likelihood fit is performed in event categories defined by the number and flavors of the leptons, the number of jets, and the number of jets identified as originating from b quarks. An inclusive $$ \textrm{t}\overline{\textrm{t}} $$ t t ¯ production cross section of 881 ± 23 (stat + syst) ± 20 (lumi) pb is measured, in agreement with the standard model prediction of $$ {924}_{-40}^{+32} $$ 924 − 40 + 32 pb.

Top-quark pole mass extraction at NNLO accuracy, from total, single- and double-differential cross sections for $$ t\overline{t} $$ + X production at the LHC

“…We start in figure 5 by comparing the absolute total tt + X cross-sections at √ s = 5.02, 7, 8, 13 and 13.6 TeV from refs. [43][44][45][46][47][48][49][50][51] with the theoretical predictions. The first row of plots shows predictions obtained with different PDF + α s (M Z ) sets, at fixed m pole t = 172.5 GeV, the second row shows predictions for different m pole t mass values, whereas the third row shows 6 The exception is the recent combined CMS and ATLAS result for the total tt +X cross section at √ s = 7 and 8 TeV [45], for which such a correlation is reported and included in our analysis.…”

“…For our analysis, we use measurements of the absolute total and normalized differential inclusive tt + X cross sections 5 as a function of various top-quark related observables O i , JHEP05(2024)321 (dσ/dO i )/σ. We collect all available and up-to-date ATLAS and CMS measurements of total tt + X cross sections [43][44][45][46][47][48][49][50][51]. These are ten data points which appear on the summary plot of the total tt + X cross sections by the LHC Working Group on Top Quark Physics as of June 2023 [95].…”

“…the experimental data published in refs. [43][44][45][46][47][48][49][50][51][52][53][54][55][56][57][58]).…”

Development of the CMS detector for the CERN LHC Run 3

“…by comparison with the predicted cross section [217]. The Z boson rates are also used as an additional method to directly compare the integrated luminosities delivered to the ATLAS and CMS experiments [218,219].…”

Measurement of top-quark electroweak couplings in associated top quark production with vector bosons at the ATLAS and CMS experiments

“…The first analyses performed on the new Run 3 data at 13.6 TeV from 2022 were σ t t measurements performed by the ATLAS and CMS experiments [9,10]. Inclusive t t cross section measurements are in particular well suited for early data due to the high rate of t t events and their distinctive signature.…”