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Measurement of the jet mass in highly boosted $t \overline{t}$ events from pp collisions at $\sqrt{s}=8$ TeV


CMS Collaboration; Canelli, Florencia; Kilminster, Benjamin; Aarestad, Thea; Caminada, Lea; De Cosa, Annapaoloa; Del Burgo, Riccardo; Donato, Silvio; Galloni, Camilla; Hinzmann, Andreas; Hreus, Tomas; Ngadiuba, Jennifer; Pinna, Deborah; Rauco, Giorgia; Robmann, Peter; Salerno, Daniel; Schweiger, Korbinian; Seitz, Claudia; Takahashi, Yuta; Zucchetta, Alberto; et al (2017). Measurement of the jet mass in highly boosted $t \overline{t}$ events from pp collisions at $\sqrt{s}=8$ TeV. European Physical Journal C - Particles and Fields, C77(7):467.

Abstract

The first measurement of the jet mass mjet of top quark jets produced in $t \overline{t}$ events from pp collisions at $\sqrt{s}=8$ TeV is reported for the jet with the largest transverse momentum $p_T$ in highly boosted hadronic top quark decays. The data sample, collected with the CMS detector, corresponds to an integrated luminosity of $19.7fb^{−1}$. The measurement is performed in the lepton + jets channel in which the products of the semileptonic decay t→bW with W→ℓν where ℓ is an electron or muon, are used to select $t \overline{t}$ events with large Lorentz boosts. The products of the fully hadronic decay t→bW with W→$q \overline q′$ are reconstructed using a single Cambridge–Aachen jet with distance parameter R=1.2, and $p_T$>400GeV. The $t \overline{t}$ cross section as a function of $m_{jet}$ is unfolded at the particle level and is used to test the modelling of highly boosted top quark production. The peak position of the $m_{jet}$ distribution is sensitive to the top quark mass $m_t$, and the data are used to extract a value of $m_t$ to assess this sensitivity.

Abstract

The first measurement of the jet mass mjet of top quark jets produced in $t \overline{t}$ events from pp collisions at $\sqrt{s}=8$ TeV is reported for the jet with the largest transverse momentum $p_T$ in highly boosted hadronic top quark decays. The data sample, collected with the CMS detector, corresponds to an integrated luminosity of $19.7fb^{−1}$. The measurement is performed in the lepton + jets channel in which the products of the semileptonic decay t→bW with W→ℓν where ℓ is an electron or muon, are used to select $t \overline{t}$ events with large Lorentz boosts. The products of the fully hadronic decay t→bW with W→$q \overline q′$ are reconstructed using a single Cambridge–Aachen jet with distance parameter R=1.2, and $p_T$>400GeV. The $t \overline{t}$ cross section as a function of $m_{jet}$ is unfolded at the particle level and is used to test the modelling of highly boosted top quark production. The peak position of the $m_{jet}$ distribution is sensitive to the top quark mass $m_t$, and the data are used to extract a value of $m_t$ to assess this sensitivity.

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Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2017
Deposited On:11 Dec 2017 13:40
Last Modified:19 Feb 2018 08:51
Publisher:Springer
ISSN:1434-6044
OA Status:Gold
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1140/epjc/s10052-017-5030-3

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