Author: Jeffrey W. Berryhill
Publisher:
ISBN:
Category : Collisions (Nuclear physics)
Languages : en
Pages : 198

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Author:
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ISBN:
Category :
Languages : en
Pages :

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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: [Study Group] ATLAS Collaboration CERN
Publisher:
ISBN:
Category :
Languages : en
Pages : 0

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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:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 704

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Author: David Michael Morse
Publisher:
ISBN:
Category :
Languages : en
Pages : 121

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Author: Zongru Wan
Publisher:
ISBN:
Category :
Languages : en
Pages : 320

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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 8

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The authors present results of a search for anomalous production of events containing a charged lepton (l, either e or?) and a photon , both with high transverse momentum, accompanied by additional signatures, X, including missing transverse energy (E{sub T}) and additional leptons and photons. We use the same kinematic selection criteria as in a previous CDF search, but with a substantially larger data set, 305 pb−1, a p{bar p} collision energy of 1.96 TeV, and the upgraded CDF II detector. We find 42 l?E{sub T} events versus a standard model expectation of 37.3 ± 5.4 events. The level of excess observed in Run I, 16 events with an expectation of 7.6 ± 0.7 events (corresponding to a 2.7? effect), is not supported by the new data. In the signature of ll? + X we observe 31 events versus an expectation of 23.0 ± 2.7 events. In this sample we find no events with an extra photon or E{sub T} and so find no events like the one ee??E{sub T} event observed in Run I.

Author: A. Loginov
Publisher:
ISBN:
Category :
Languages : en
Pages : 10

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The authors present results of a search in 929 {+-} 56 pb{sup -1} of p{bar p} collisions at 1.96 TeV for the anomalous production of events containing a charged lepton ({ell}, either e or {mu}) and a photon ({gamma}), both with high transverse momentum, accompanied by additional signatures, X, including missing transverse energy (E{sub T}) and additional leptons and photons. They use the same selection criteria as in the previous CDF Run I search, but with an order-magnitude larger data set, a higher p{bar p} collision energy, and the CDF II detector.

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 8

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The authors present results of a search for anomalous production of events containing a charged lepton (l, either e or [mu]) and a photon ([gamma]), both with high transverse momentum, accompanied by additional signatures, X, including missing transverse energy (E{sub T}) and additional leptons and photons. We use the same kinematic selection criteria as in a previous CDF search, but with a substantially larger data set, 305 pb−1, a p{bar p} collision energy of 1.96 TeV, and the upgraded CDF II detector. We find 42 l[gamma]E{sub T} events versus a standard model expectation of 37.3 ± 5.4 events. The level of excess observed in Run I, 16 events with an expectation of 7.6 ± 0.7 events (corresponding to a 2.7[sigma] effect), is not supported by the new data. In the signature of ll[gamma] + X we observe 31 events versus an expectation of 23.0 ± 2.7 events. In this sample we find no events with an extra photon or E{sub T} and so find no events like the one ee[gamma][gamma]E{sub T} event observed in Run I.

Author: Thomas Gordon Carter
Publisher:
ISBN:
Category : Particles (Nuclear physics)
Languages : en
Pages : 524

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