Inclusive and differential cross section measurements of t t ¯ b b ¯ production in the lepton+jets channel at √𝑠 = 13 TeV
Measurements of inclusive and normalized differential cross sections of the associated production of top quark-antiquark and bottom quark-antiquark pairs, t t...
| Main Authors: | , , , , , , , , , , , , , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
Springer Science and Business Media LLC
2024
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| Online Access: | https://hdl.handle.net/1721.1/155004 |
| _version_ | 1824458202404618240 |
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| author | Hayrapetyan, A. Tumasyan, A. Adam, W. Andrejkovic, J. W. Bergauer, T. Chatterjee, S. Damanakis, K. Dragicevic, M. Escalante Del Valle, A. Hussain, P. S. Jeitler, M. Krammer, N. Liko, D. Mikulec, I. Schieck, J. Schöfbeck, R. Schwarz, D. |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Hayrapetyan, A. Tumasyan, A. Adam, W. Andrejkovic, J. W. Bergauer, T. Chatterjee, S. Damanakis, K. Dragicevic, M. Escalante Del Valle, A. Hussain, P. S. Jeitler, M. Krammer, N. Liko, D. Mikulec, I. Schieck, J. Schöfbeck, R. Schwarz, D. |
| author_sort | Hayrapetyan, A. |
| collection | MIT |
| description | Measurements of inclusive and normalized differential cross sections of the associated production of top quark-antiquark and bottom quark-antiquark pairs,
t
t
¯
b
b
¯
$$ \textrm{t}\overline{\textrm{t}}\textrm{b}\overline{\textrm{b}} $$
, are presented. The results are based on data from proton-proton collisions collected by the CMS detector at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 138 fb−1. The cross sections are measured in the lepton+jets decay channel of the top quark pair, using events containing exactly one isolated electron or muon and at least five jets. Measurements are made in four fiducial phase space regions, targeting different aspects of the
t
t
¯
b
b
¯
$$ \textrm{t}\overline{\textrm{t}}\textrm{b}\overline{\textrm{b}} $$
process. Distributions are unfolded to the particle level through maximum likelihood fits, and compared with predictions from several event generators. The inclusive cross section measurements of this process in the fiducial phase space regions are the most precise to date. In most cases, the measured inclusive cross sections exceed the predictions with the chosen generator settings. The only exception is when using a particular choice of dynamic renormalization scale,
μ
R
=
1
2
∏
i
=
t
,
t
¯
,
b
,
b
¯
m
T
,
i
1
/
4
$$ {\mu}_{\textrm{R}}=\frac{1}{2}{\prod}_{i=\textrm{t},\overline{\textrm{t}},\textrm{b},\overline{\textrm{b}}}{m}_{\textrm{T},i}^{1/4} $$
, where
m
T
,
i
2
=
m
i
2
+
p
T
,
i
2
$$ {m}_{\textrm{T},i}^2={m}_i^2+{p}_{\textrm{T},i}^2 $$
are the transverse masses of top and bottom quarks. The differential cross sections show varying degrees of compatibility with the theoretical predictions, and none of the tested generators with the chosen settings simultaneously describe all the measured distributions. |
| first_indexed | 2024-09-23T13:08:20Z |
| format | Article |
| id | mit-1721.1/155004 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2025-02-19T04:22:08Z |
| publishDate | 2024 |
| publisher | Springer Science and Business Media LLC |
| record_format | dspace |
| spelling | mit-1721.1/1550042025-02-05T21:15:01Z Inclusive and differential cross section measurements of t t ¯ b b ¯ production in the lepton+jets channel at √𝑠 = 13 TeV Hayrapetyan, A. Tumasyan, A. Adam, W. Andrejkovic, J. W. Bergauer, T. Chatterjee, S. Damanakis, K. Dragicevic, M. Escalante Del Valle, A. Hussain, P. S. Jeitler, M. Krammer, N. Liko, D. Mikulec, I. Schieck, J. Schöfbeck, R. Schwarz, D. Massachusetts Institute of Technology. Department of Physics Measurements of inclusive and normalized differential cross sections of the associated production of top quark-antiquark and bottom quark-antiquark pairs, t t ¯ b b ¯ $$ \textrm{t}\overline{\textrm{t}}\textrm{b}\overline{\textrm{b}} $$ , are presented. The results are based on data from proton-proton collisions collected by the CMS detector at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 138 fb−1. The cross sections are measured in the lepton+jets decay channel of the top quark pair, using events containing exactly one isolated electron or muon and at least five jets. Measurements are made in four fiducial phase space regions, targeting different aspects of the t t ¯ b b ¯ $$ \textrm{t}\overline{\textrm{t}}\textrm{b}\overline{\textrm{b}} $$ process. Distributions are unfolded to the particle level through maximum likelihood fits, and compared with predictions from several event generators. The inclusive cross section measurements of this process in the fiducial phase space regions are the most precise to date. In most cases, the measured inclusive cross sections exceed the predictions with the chosen generator settings. The only exception is when using a particular choice of dynamic renormalization scale, μ R = 1 2 ∏ i = t , t ¯ , b , b ¯ m T , i 1 / 4 $$ {\mu}_{\textrm{R}}=\frac{1}{2}{\prod}_{i=\textrm{t},\overline{\textrm{t}},\textrm{b},\overline{\textrm{b}}}{m}_{\textrm{T},i}^{1/4} $$ , where m T , i 2 = m i 2 + p T , i 2 $$ {m}_{\textrm{T},i}^2={m}_i^2+{p}_{\textrm{T},i}^2 $$ are the transverse masses of top and bottom quarks. The differential cross sections show varying degrees of compatibility with the theoretical predictions, and none of the tested generators with the chosen settings simultaneously describe all the measured distributions. 2024-05-20T18:16:17Z 2024-05-20T18:16:17Z 2024-05-06 2024-05-19T03:13:20Z Article http://purl.org/eprint/type/JournalArticle 1029-8479 https://hdl.handle.net/1721.1/155004 The CMS collaboration., Hayrapetyan, A., Tumasyan, A. et al. Inclusive and differential cross section measurements of t t ¯ b b ¯ production in the lepton+jets channel at √𝑠 = 13 TeV. J. High Energ. Phys. 2024, 42 (2024). PUBLISHER_CC en 10.1007/jhep05(2024)042 Journal of High Energy Physics Creative Commons Attribution https://creativecommons.org/licenses/by/4.0/ The Author(s) application/pdf Springer Science and Business Media LLC Springer Berlin Heidelberg |
| spellingShingle | Hayrapetyan, A. Tumasyan, A. Adam, W. Andrejkovic, J. W. Bergauer, T. Chatterjee, S. Damanakis, K. Dragicevic, M. Escalante Del Valle, A. Hussain, P. S. Jeitler, M. Krammer, N. Liko, D. Mikulec, I. Schieck, J. Schöfbeck, R. Schwarz, D. Inclusive and differential cross section measurements of t t ¯ b b ¯ production in the lepton+jets channel at √𝑠 = 13 TeV |
| title | Inclusive and differential cross section measurements of t t ¯ b b ¯ production in the lepton+jets channel at √𝑠 = 13 TeV |
| title_full | Inclusive and differential cross section measurements of t t ¯ b b ¯ production in the lepton+jets channel at √𝑠 = 13 TeV |
| title_fullStr | Inclusive and differential cross section measurements of t t ¯ b b ¯ production in the lepton+jets channel at √𝑠 = 13 TeV |
| title_full_unstemmed | Inclusive and differential cross section measurements of t t ¯ b b ¯ production in the lepton+jets channel at √𝑠 = 13 TeV |
| title_short | Inclusive and differential cross section measurements of t t ¯ b b ¯ production in the lepton+jets channel at √𝑠 = 13 TeV |
| title_sort | inclusive and differential cross section measurements of t t ¯ b b ¯ production in the lepton jets channel at √𝑠 13 tev |
| url | https://hdl.handle.net/1721.1/155004 |
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