Precision searches for new physics with boosted bosons combined
Final Report Abstract
The Run2 of the Large Hadron Collider (LHC) at a proton-proton center-of-mass energy of 13 TeV enabled probing electroweak boson pair production at invariant masses of multiple TeVs for the first time. Enhancements in boson pair production cross section are typical signatures of theories of beyond the standard model (BSM) physics like extra spatial dimensions or composite Higgs boson models that can provide a solution to the hierarchy problem. The experimental signature of high mass boson pair production is particularly challenging as W, Z and Higgs bosons primarily decay to a pair of quarks, forming at high momentum (Lorentz-boost) a single particle jet whose substructure must be resolved to identify its origin. The experimental techniques for the identification of boosted bosons with the CMS experiment have been significantly advanced in this project, including a new technique to mitigate additional collisions happening in the same bunch crossing (pileup) and improved identification algorithms making use of machine learning. In addition, new measurements of jet substructure have been carried out to reduce the dominant uncertainty in boosted boson identification and improve simulation models. Hints of a diboson resonance at masses of around 2 TeV from ATLAS and CMS seen in LHC Run1 have not been confirmed, excluding heavy-vector triplet resonances with masses below 2.4 TeV at 95% confidence level. With increased datasets corresponding to 36/fb, 78/fb and 138/fb, and advances in the analysis techniques, this mass limit has progressively been increased up to 4.8 TeV. At the same time, the mass spectrum of WW and WZ boson pair production has been studied for the first time up to 4 TeV to look for non-resonant enhancements. This analysis yielded the most stringent limits on anomalous WWγ and WWZ couplings, indicators of BSM physics at high energies, e.g. modifications of the Higgs sector. Diboson pair production remains a signature with discovery potential also in Run3 of LHC and at its successor HL-LHC with 2 times and 20 times, respectively, more collision data expected. The planned upgrades of CMS for the HL-LHC, have been shown to maintain jet substructure performance under the expected conditions with up to 200 pileup interactions and even improved. The importance of new detector concepts for jet substructure performance has been studied for future colliders beyond HL-LHC, motivating the development of highly granular calorimeters.
Publications
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Measurement of jet charge in dijet events froms=8 TeVppcollisions with the ATLAS detector. Physical Review D, 93(5).
Aad, G.; Abbott, B.; Abdallah, J.; Abdinov, O.; Aben, R.; Abolins, M.; AbouZeid, O. S.; Abramowicz, H.; Abreu, H.; Abreu, R.; Abulaiti, Y.; Acharya, B. S.; Adamczyk, L.; Adams, D. L.; Adelman, J.; Adomeit, S.; Adye, T.; Affolder, A. A.; Agatonovic-Jovin, T. ... & Zwalinski, L.
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Combination of searches for heavy resonances decaying to WW, WZ, ZZ, WH, and ZH boson pairs in proton–proton collisions at s=8 and 13 TeV. Physics Letters B, 774, 533-558.
Sirunyan, A.M.; Tumasyan, A.; Adam, W.; Asilar, E.; Bergauer, T.; Brandstetter, J.; Brondolin, E.; Dragicevic, M.; Erö, J.; Flechl, M.; Friedl, M.; Frühwirth, R.; Ghete, V.M.; Hartl, C.; Hörmann, N.; Hrubec, J.; Jeitler, M.; König, A.; Krätschmer, I. ... & Woods, N.
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“CMS expands scope of dark-matter search in dijet channel”, CERN COURIER 11.08.2017
CMS Collaboration
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“Jet algorithms performance in 13 TeV data”, CMS Physics Analysis Summary CMS-PAS-JME-16-003 (2017)
CMS Collaboration
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“The Phase-2 Upgrade of the CMS Endcap Calorimeter”, CMS Technical Design Report CMS-TDR-019 (2017)
CMS Collaboration
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“The Phase-2 Upgrade of the CMS Tracker”, CMS Technical Design Report CMS-TDR-014 (2017)
CMS Collaboration
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Search for massive resonances decaying into WW , WZ , ZZ , qW , and qZ with dijet final states at s=13 TeV. Physical Review D, 97(7).
Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Ambrogi, F.; Asilar, E.; Bergauer, T.; Brandstetter, J.; Brondolin, E.; Dragicevic, M.; Erö, J.; Flechl, M.; Friedl, M.; Frühwirth, R.; Ghete, V. M.; Grossmann, J.; Hrubec, J.; Jeitler, M.; König, A.; Krammer, N. ... & N. Woods, N.
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The importance of calorimetry for highly-boosted jet substructure. Journal of Instrumentation, 13(01), T01003-T01003.
Coleman, E.; Freytsis, M.; Hinzmann, A.; Narain, M.; Thaler, J.; Tran, N. & Vernieri, C.
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Vector boson scattering: Recent experimental and theory developments. Reviews in Physics, 3, 44-63.
Alessandro Ballestrero; Riccardo Bellan; Benedikt Biedermann; Carsten Bittrich; Ilaria Brivio; Andrea Cardini; Guillelmo Gomez-Ceballos; Claude Charlot; Vitaliano Ciulli; Roberto Covarelli; Javier Cuevas; Ansgar Denner; Stefan Dittmaier; Lucia Di Ciaccio; Senka Duric; Lauwers E. Jasper Gerard; Sinead Farrington; Pamela Ferrari; Pedro Ferreira Silva ... & Dieter Zeppenfeld
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Jet substructure at the Large Hadron Collider. Reviews of Modern Physics, 91(4).
Kogler, Roman; Nachman, Benjamin; Schmidt, Alexander; Asquith, Lily; Winkels, Emma; Campanelli, Mario; Delitzsch, Chris; Harris, Philip; Hinzmann, Andreas; Kar, Deepak; McLean, Christine; Pilot, Justin; Takahashi, Yuta; Tran, Nhan; Vernieri, Caterina & Vos, Marcel
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Prospects for a measurement of the W boson mass in the all-jets final state at hadron colliders. Journal of High Energy Physics, 2019(2).
Freytsis, Marat; Harris, Philip; Hinzmann, Andreas; Moult, Ian; Tran, Nhan & Vernieri, Caterina
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Search for a heavy resonance decaying to a top quark and a vector-like top quark in the lepton + jets final state in pp collisions at $$\sqrt{s} = 13\,\text {TeV} $$ s = 13 TeV. The European Physical Journal C, 79(3).
Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Ambrogi, F.; Asilar, E.; Bergauer, T.; Brandstetter, J.; Dragicevic, M.; Erö, J.; Del Valle, A. Escalante; Flechl, M.; Frühwirth, R.; Ghete, V. M.; Hrubec, J.; Jeitler, M.; Krammer, N.; Krätschmer, I.; Liko, D. ... & Woods, N.
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Search for anomalous triple gauge couplings in WW and WZ production in lepton + jet events in proton-proton collisions at $$ \sqrt{s} $$ = 13 TeV. Journal of High Energy Physics, 2019(12).
Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Ambrogi, F.; Bergauer, T.; Brandstetter, J.; Dragicevic, M.; Erö, J.; Escalante, Del Valle A.; Flechl, M.; Frühwirth, R.; Jeitler, M.; Krammer, N.; Krätschmer, I.; Liko, D.; Madlener, T.; Mikulec, I.; Rad, N. ... & Woods, N.
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“CMS ECAL performance with 2017 data”, CMS Detector Performance Summary CMS-DP-2019-029 (2019)
CMS Collaboration
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“How CMS weeds out particles that pile up”, CMS Physics Briefings 12.09.2019
CMS Collaboration
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“Tracker Performance in 2017 Legacy processing”, CMS Detector Performance Summary CMS-DP-2019-027 (2019)
CMS Collaboration
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"W and top tagging scale factors for Run 2 data”, CMS Detector Performance Summary CMS-DP-2020-025 (2020)
CMS Collaboration
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A multi-dimensional search for new heavy resonances decaying to boosted $$\text{ W }{}{}$$ $$\text{ W }{}{}$$ , $$\text{ W }{}{}$$ $$\text{ Z }{}{}$$ , or $$\text{ Z }{}{}$$ $$\text{ Z }{}{}$$ boson pairs in the dijet final state at 13 $$\text {Te}\text {V}$$. The European Physical Journal C, 80(3).
Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Ambrogi, F.; Bergauer, T.; Brandstetter, J.; Dragicevic, M.; Erö, J.; Del Valle, A. Escalante; Flechl, M.; Frühwirth, R.; Jeitler, M.; Krammer, N.; Krätschmer, I.; Liko, D.; Madlener, T.; Mikulec, I.; Rad, N. ... & Woods, N.
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Identification of heavy, energetic, hadronically decaying particles using machine-learning techniques. Journal of Instrumentation, 15(06), P06005-P06005.
Sirunyan, A.M.; Tumasyan, A.; Adam, W.; Ambrogi, F.; Bergauer, T.; Dragicevic, M.; Erö, J.; Valle, A. Escalante Del; Flechl, M.; Frühwirth, R.; Jeitler, M.; Krammer, N.; Krätschmer, I.; Liko, D.; Madlener, T.; Mikulec, I.; Rad, N.; Schieck, J.; Schöfbeck, R. ... & Golf, F.
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Pileup mitigation at CMS in 13 TeV data. Journal of Instrumentation, 15(09), P09018-P09018.
Sirunyan, A.M.; Tumasyan, A.; Adam, W.; Ambrogi, F.; Bergauer, T.; Dragicevic, M.; Erö, J.; Valle, A. Escalante Del; Flechl, M.; Frühwirth, R.; Jeitler, M.; Krammer, N.; Krätschmer, I.; Liko, D.; Madlener, T.; Mikulec, I.; Rad, N.; Schieck, J.; Schöfbeck, R. ... & Finco, L.
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“Performance of the pile up jet identification in CMS for Run 2”, CMS Detector Performance Summary CMS-DP-2020-020 (2020)
CMS Collaboration
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“Phase-I Pixel ROC Thresholds and DC-DC Converter Characterization in 2018”, CMS Detector Performance Summary CMS-DP-2020-005 (2020)
CMS Collaboration
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“Pixel Charge Profiles in Run-2 Data and Simulation”, CMS Detector Performance Summary CMS-DP-2020-026 (2020)
CMS Collaboration
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„Identification of highly Lorentz-boosted heavy particles using graph neural networks and new mass decorrelation techniques“, CMS Detector Performance Summary CMS-DP-2020-002 (2020)
CMS Collaboration
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“Extraction and validation of a set of HERWIG 7 tunes from CMS underlyingevent measurements”, CMS Physics Analysis Summary CMS-PAS-GEN-19-001
CMS Collaboration
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“Jet energy scale and resolution measurement with Run~2 Legacy Data Collected by CMS at 13~TeV”, CMS Detector Performance Summary CMS-DP-2021-033 (2021)
MS Collaboration
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“Pileup-per-particle identification: optimisation for Run 2 Legacy and beyond”, CMS Detector Performance Summary CMS-DP-2021-001 (2021)
CMS Collaboration
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Jets and Jet Substructure at Future Colliders. Frontiers in Physics, 10.
Bonilla, Johan; Chachamis, Grigorios; Dillon, Barry M.; Chekanov, Sergei V.; Erbacher, Robin; Gouskos, Loukas; Hinzmann, Andreas; Höche, Stefan; Huffman, B. Todd; Kotwal, Ashutosh. V.; Kar, Deepak; Kogler, Roman; Lange, Clemens; LeBlanc, Matt; Lemmon, Roy; McLean, Christine; Nachman, Benjamin; Neubauer, Mark S.; Plehn, Tilman ... & Yu, Shin-Shan
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Position resolution with 25 µm pitch pixel sensors before and after irradiation. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1021, 165933.
Zoi, I.; Ebrahimi, A.; Feindt, F.; Garutti, E.; Gunnellini, P.; Hinzmann, A.; Niemeyer, C.; Pitzl, D.; Schwandt, J. & Steinbrück, G.
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Study of quark and gluon jet substructure in Z+jet and dijet events from pp collisions. Journal of High Energy Physics, 2022(1).
Tumasyan, A.; Adam, W.; Andrejkovic, J. W.; Bergauer, T.; Chatterjee, S.; Dragicevic, M.; Escalante, Del Valle A.; Frühwirth, R.; Jeitler, M.; Krammer, N.; Lechner, L.; Liko, D.; Mikulec, I.; Paulitsch, P.; Pitters, F. M.; Schieck, J.; Schöfbeck, R.; Spanring, M. ... & Vetens, W.
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“Two collisions for the price of one”, CMS Physics Briefings 7.06.2022
CMS Collaboration
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“Vierblättriger Vektorboson-Klee”, Physik Journal Oktober 2022
A. Hinzmann; A. Huss & K. Lohwasser
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“W, Z, and Higgs bosons as portals to exotic physics”, CMS Physics Briefings 13.05.2022
CMS Collaboration
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Observation of Same-Sign WW Production from Double Parton Scattering in Proton-Proton Collisions at s=13 TeV. Physical Review Letters, 131(9).
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.; Lechner, L.; Liko, D.; Mikulec, I.; Paulitsch, P.; Pitters, F. M.; Schieck, J.; Schöfbeck, R.; Schwarz, D. ... & Templ, S.
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Search for new heavy resonances decaying to WW, WZ, ZZ, WH, or ZH boson pairs in the all-jets final state in proton-proton collisions at s=13TeV. Physics Letters B, 844, 137813.
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.; Lechner, L.; Liko, D.; Mikulec, I.; Paulitsch, P.; Pitters, F.M.; Schieck, J.; Schöfbeck, R.; Schwarz, D. ... & Zhokin, A.
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“Calibration of the Jet Mass Scale using boosted W bosons and top quarks”, CMS Detector Performance Summary, CMS-DP-2023-044, (2023)
CMS Collaboration
