Measurement of the jet mass in hadronic decays of boosted W bosons at 13 TeV and extraction of the W boson mass

The jet mass of W bosons decaying to a quark-antiquark pair is measured in W+jets events from proton-proton collisions at a center-of-mass energy of 13 TeV. The data used were collected by the CMS experiment at the CERN LHC and correspond to an integrated luminosity of 138 fb$^{−1}$. Hadronic decays of W bosons with high momenta produce strongly collimated decay products due to the large Lorentz boost, and are reconstructed as single large-radius jets. These jets have a characteristic substructure that is exploited to distinguish them from the large background of quark- and gluon-initiated jets. The jet mass is computed using the soft-drop algorithm, which suppresses soft wide-angle radiation that leads to a broadening of the jet mass distribution. For the first time, unfolded measurements are presented of the double-differential W+jets cross section as a function of the jet transverse momentum and soft-drop mass. From these distributions, the W boson mass is obtained, with a value of 80.83 ± 0.55 GeV in a scheme with mass-dependent width, achieving the smallest uncertainty available today from an all-jets final state at a hadron collider.

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Publication Details

Journal
KITopen
Published
2026-07-24
DOI
https://doi.org/10.5445/ir/1000195549
Primary Topic
Particle physics theoretical and experimental studies
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article
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article

Measurement of the jet mass in hadronic decays of boosted W bosons at 13 TeV and extraction of the W boson mass

A Sharma, F Zhang, A Das, P Van Mechelen et al.
KITopen
Particle physics theoretical and experimental studies
article

Measurement of the jet mass in hadronic decays of boosted W bosons at 13 TeV and extraction of the W boson mass

A Sharma, F Zhang, A Das, P Van Mechelen, I V Makarenko, Alves GA, An Li, Schieck, C. Hensel, I Mikulec, C Sturm for the KaoS Collaboration, K Skovpen, V Lemaître, J. Song, M Delcourt, J D'hondt, H Kwon, M N Matthewman, G W P De lentdecker, S L Bein, J Van der linden, G P Van onsem, M G Tytgat, M G Dragicevic, T Bergauer, B Clerbaux, A Tumasyan, S R J Lowette, L Thomas, N Krammer, V Makarenko, L Favart, P Vanlaer, A Giammanco, S Van putte, S Tavernier, A Benecke, C Delaere, D Schwarz, A F Moor, M. De Coen, C.-E. Wulz, J. Lidrych, C. Mora Herrera, P. Kashko, P. Malek, T. Van Laer, F. Heyen, S. Turkcapar, G. Gokbulut, N. Van Den Bossche, M. Vanden Bemden, C. Vander Velde, D. Dobur, D. Marckx, P. S. Hussain, J. Bierkens, J. De Favereau De Jeneret, M. Jeitler, J. Knolle, F. Gameiro Casalinho, J. Vandenbroeck, D. Vannerom, Y. Hong, G. Bruno, H. Evard, P. Mastrapasqua, H. Aarup Petersen, P. Gianneios, M. Shooshtari, W. Waltenberger, A. Cappati, N. Breugelmans, E. Coelho, D. Liko, M. A. Shahzad, R. Schöfbeck, S. Dansana, B. Bilin, M. Sonawane, A. Khalilzadeh, M. Barroso Ferreira Filho, A. O. Guzel, D. Ocampo Henao, T. Menezes De Oliveira, A. Hayrapetyan, I. De Bruyn, A. M. Tomaru, A. Bethani, W. Adam, T. Janssen, A. Malara, L. Benato, J. W. Andrejkovic, M. Soeiro, C. Giordano, D. Müller, L. Wezenbeek, P. Rebello Teles, F. A. Khan
article en

Abstract

The jet mass of W bosons decaying to a quark-antiquark pair is measured in W+jets events from proton-proton collisions at a center-of-mass energy of 13 TeV. The data used were collected by the CMS experiment at the CERN LHC and correspond to an integrated luminosity of 138 fb$^{−1}$. Hadronic decays of W bosons with high momenta produce strongly collimated decay products due to the large Lorentz boost, and are reconstructed as single large-radius jets. These jets have a characteristic substructure that is exploited to distinguish them from the large background of quark- and gluon-initiated jets. The jet mass is computed using the soft-drop algorithm, which suppresses soft wide-angle radiation that leads to a broadening of the jet mass distribution. For the first time, unfolded measurements are presented of the double-differential W+jets cross section as a function of the jet transverse momentum and soft-drop mass. From these distributions, the W boson mass is obtained, with a value of 80.83 ± 0.55 GeV in a scheme with mass-dependent width, achieving the smallest uncertainty available today from an all-jets final state at a hadron collider.

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