Search For New Phenomena In Three Or Four Lepton Events In Pp Collisions At Square Roots
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| Author | : [Study Group] ATLAS Collaboration CERN |
| Publisher | : |
| Total Pages | : 0 |
| Release | : 2022 |
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Abstract: A search with minimal model dependence for physics beyond the Standard Model in events featuring three or four charged leptons (3l and 4l, ) is presented. The analysis aims to be sensitive to a wide range of potential new-physics theories simultaneously. This analysis uses data from pp collisions delivered by the Large Hadron Collider at a centre-of-mass energy of TeV and recorded with the ATLAS detector, corresponding to the full Run 2 dataset of 139 fb−1. The 3l and 4l phase space is divided into 22 event categories according to the number of leptons in the event, the missing transverse momentum, the invariant mass of the leptons, and the presence of leptons originating from a Z-boson candidate. These event categories are analysed independently for the presence of deviations from the Standard Model. No statistically significant deviations from the Standard Model predictions are observed. Upper limits for all signal regions are reported in terms of the visible cross-section
| Author | : Jeffrey W. Berryhill |
| Publisher | : |
| Total Pages | : 198 |
| Release | : 2000 |
| Genre | : Collisions (Nuclear physics) |
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| Total Pages | : 18 |
| Release | : 2013 |
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| Author | : Joel M. Piper |
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| Total Pages | : 648 |
| Release | : 2010 |
| Genre | : Leptons (Nuclear physics) |
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| Release | : 2003 |
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We present the results of a search in p[bar p] collisions at[radical]s= 1.8 TeV for anomalous production of events containing a photon with large transverse energy and a lepton (e or[mu]) with large transverse energy, using 86 pb[sup -1] of data collected at the Collider Detector at Fermilab during the 1994-95 collider run at the Fermilab Tevatron. The presence of large missing transverse energy (E[sub T]), additional photons, or additional leptons in these events is also analyzed. The results are consistent with standard model expectations, with the possible exception of photon-lepton events with large E[sub T], for which the probability of a statistical fluctuation of the standard model expectation up to and above the observed level is 0.7%.
| Author | : Valerio Rossetti |
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| Total Pages | : 0 |
| Release | : 2013 |
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| Author | : Rachel Paula Yohay |
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| Total Pages | : |
| Release | : 2012 |
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| Release | : 2012 |
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We describe a model independent search for physics beyond the standard model in lepton final states. We examine 117 final states using 1.1 fb-1 of pp collisions data at √s = 1.96 TeV collected with the D0 detector. We conclude that all observed discrepancies between data and model can be attributed to uncertainties in the standard model background modeling, and hence we do not see any evidence for physics beyond the standard model.
| Author | : |
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| Total Pages | : 6 |
| Release | : 2007 |
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Numerous searches for new phenomena have been carried out using data from proton-antiproton collisions at Fermilab's Tevatron. Final states with leptons give signatures which are relatively unique and generally have small backgrounds. We present many of the latest results from the CDF and D0 collaborations from 0.4-1.2 fb−1 of data. Topics include supersymmetry, extra gauge bosons, Randall-Sundrum gravitons, excited electrons and neutral, long-lived particles.
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| Total Pages | : 15 |
| Release | : 2007 |
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The authors present results of a search at CDF in 929 ± 56 pb−1 of p{bar p} collisions at 1.96 TeV for the anomalous production of events containing a high-transverse momentum charged lepton (l, either e or?) and photon , accompanied by missing transverse energy (E{sub T}), and/or additional leptons and photons, and jets (X). They use the same selection criteria as in a previous CDF Run I search, but with an order-magnitude larger data set, a higher p{bar p} collisions energy, and the CDF II detector. They find 163 l?E{sub T} + X events, compared to an expectation of 150.6 ± 13.0 events. They observe 74 ll? + X events, compared to an expectation of 65.1 ± 7.7 events. They find no events similar to the Run II ee??E{sub T} event.
