Precision Top-Quark Mass Measurement at CDF

Aaltonen, T.; González, B.; Amerio, S.; Amidei, D.; Anastassov, A.; Annovi, A.; Antos̆, J.; Apollinari, G.; Appel, J. A.; Arisawa, T.; Artikov, A.; Asaadi, J.; Ashmanskas, W.; Auerbach, B.; Aurisano, A.; Azfar, F.; Badgett, W.; Bae, T.; Barbaro‐Galtieri, A.; Barnes, V. E.; Barnett, B. A.; Barria, P.; Bartoš, P.; Bauce, M.; Bedeschi, F.; Behari, S.; Bellettini, G.; Bellinger, J.; Benjamin, D.; Beretvas, A.; Bhatti, A.; Bisello, D.; Bizjak, I.; Bland, K. R.; Blumenfeld, B.; Bocci, A.; Bodek, A.; Bortoletto, D.; Boudreau, J.; Boveia, A.; Brigliadori, L.; Bromberg, C.; Brücken, E.; Budagov, J.; Budd, H. S.; Burkett, K.; Busetto, G.; Bussey, P.; Buzatu, A.; Calamba, A.; Calancha, C.; Camarda, S.; Campanelli, M.; Campbell, M.; Canelli, F.; Carls, B.; Carlsmith, D.; Carosi, R.; Carrillo, S.; Carron, S.; Casal, B.; Casarsa, M.; Castro, A.; Catastini, P.; Cauz, D.; Cavaliere, V.; Cavalli‐Sforza, M.; Cerri, A.; Cerrito, L.; Chen, Y. C.; Chertok, M.; Chiarelli, G.; Chlachidze, G.; Chlebana, F.; Cho, K.; Chokheli, D.; Chung, W. H.; Chung, Y. S.; Ciocci, M. A.; Clark, A.; Clarke, Christopher; Compostella, G.; Convery, M. E.; Conway, J.; Corbo, M.; Cordelli, M.; Cox, C. A.; Cox, D. J.; Crescioli, F.; Cuevas, J.; Culbertson, R.; Dagenhart, D.; D’Ascenzo, N.; Datta, M.; Barbaro, P. de; Dell’Orso, M.; Demortier, L.; Deninno, M.; Devoto, F.; D’Errico, M.; Canto, A. Di; Ruzza, B. Di; Dittmann, J.; D’Onofrio, M.; Donati, S.; Dong, P.; Dorigo, M.; Dorigo, T.; Ebina, K.; Elagin, A.; Eppig, A.; Erbacher, R.; Errede, S.; Ershaidat, N.; Eusebi, R.; Farrington, S. M.; Feindt, M.; Fernández, J. P.; Field, R. D.; Flanagan, G.; Forrest, R.; Frank, M. J.; Franklin, M.; Freeman, J.; Funakoshi, Y.; Furic, I. K.; Gallinaro, M.; Garcia, J. E.; Garfinkel, A. F.; Garosi, P.; Gerberich, H.; Gerchtein, E.; Giagu, S.; Giakoumopoulou, V.; Giannetti, P.; Gibson, K.; Ginsburg, C. M.; Giokaris, N.; Giromini, P.; Giurgiu, G.; Glagolev, V.; Glenzinski, D.; Gold, M.; Goldin, D.; Goldschmidt, N.; Golossanov, A.; Gómez, G.; Gómez-Ceballos, G.; Goncharov, M.; González, O.; Gorelov, I.; Goshaw, A. T.; Goulianos, K.; Grinstein, S.; Grosso-Pilcher, C.; Costa, J. Guimarães da; Hahn, S. R.; Halkiadakis, E.; Hamaguchi, A.; Han, J.; Happacher, F.; Hara, K.; Hare, D.; Hare, M.; Harr, R.; Hatakeyama, K.; Hays, C. P.; Heck, M.; Heinrich, J.; Herndon, M.; Hewamanage, S.; Höcker, A.; Hopkins, W. H.; Horn, David; Hou, S.; Hughes, R. E.; Hurwitz, M.; Husemann, U.; Hussain, N.; Hussein, M.; Huston, J.; Introzzi, G.; Iori, M.; Ivanov, A.; James, E.; Jang, D.; Jayatilaka, B.; Jeon, E. J.; Jindariani, S.; Jones, M.; Joo, K. K.; Jun, S. Y.; Junk, T. R.; Kamon, T.; Karchin, P. E.; Kasmi, A.; Kato, Y.; Ketchum, W.; Keung, J.; Khotilovich, V.; Kilminster, B.; Kim, D. H.; Kim, H. S.; Kim, J. E.; Kim, M. J.; Kim, S. B.; Kim, S. H.; Kim, Y. K.; Kim, Y. J.; Kimura, N.; Kirby, M.; Klimenko, S.; Knoepfel, K. J.; Kondo, K.; Kong, D. J.; Königsberg, J.; Kotwal, A.; Kreps, M.; Kroll, J.; Krop, D.; Kruse, M. C.; Krutelyov, V.; Kuhr, T.; Kurata, M.; Kwang, S.; Laasanen, A. T.; Lami, S.; Lammel, S.; Lancaster, M.; Lander, R.; Lannon, K.; Lath, A.; Latino, G.; LeCompte, T.; Lee, E.; Lee, H. S.; Lee, J. S.; Lee, S. W.; Leo, S.; Leone, S.; Lewis, J. D.; Limosani, A.; Lin, C. J.; Lindgren, M.; Lipeles, E.; Lister, A.; Litvintsev, D. O.; Liu, C.; Liu, H.; Liu, Q.; Liu, T.; Lockwitz, S.; Loginov, A.; Lucchesi, D.; Lueck, J.; Lujan, P.; Lukens, P.; Lungu, G.; Lys, J.; Lysák, R.; Madrak, R.; Maeshima, K.; Maestro, P.; Malik, S.; Manca, G.; Manousakis-Katsikakis, A.; Margaroli, F.; Marino, C. P.; Martı́nez, M.; Mastrandrea, P.; Matera, K.; Mattson, M. E.; Mazzacane, A.; Mazzanti, P.; McFarland, K. S.; McIntyre, P.; McNulty, R.; Mehta, A.; Mehtälä, P.; Mesropian, C.; Miao, T.; Mietlicki, D.; Mitra, A.; Miyake, H.; Moêd, S.; Moggi, N.; Mondragón, M. N.; Moon, C. S.; Moore, R.; Morello, M. J.; Morlock, J.; Fernandez, P. Movilla; Mukherjee, A.; Müller, Th.; Murat, P.; Mussini, M.; Nachtman, J.; Nagai, Y.; Naganoma, J.; Nakano, I.; Napier, A.; Nett, J.; Neu, C.; Neubauer, M. S.; Nielsen, J.; Nodulman, L.; Noh, S. Y.; Norniella, O.; Oakes, L.; Oh, S. H.; Oh, Y. D.; Oksuzian, I.; Okusawa, T.; Orava, R.; Ortolan, L.; Griso, S. Pagan; Pagliarone, C.; Palencia, E.; Papadimitriou, V.; Paramonov, A.; Patrick, J.; Pauletta, G.; Paulini, M.; Paus, C.; Pellett, D.; Penzo, A.; Phillips, T. J.; Piacentino, G.; Pianori, E.; Pilot, J.; Pitts, K.; Plager, C.; Pondrom, L.; Poprocki, S.; Potamianos, K.; Prokoshin, F.; Pranko, A.; Ptohos, F.; Punzi, G.; Rahaman, A.; Ramakrishnan, V.; Ranjan, N.; Redondo, I.; Renton, P.; Rescigno, M.; Riddick, T.; Rimondi, F.; Ristori, L.; Robson, A.; Rodrigo, T.; Rodriguez, T.; Rogers, E.; Rolli, S.; Roser, R.; Ruffini, F.; Ruiz, A.; Russ, J.; Rusu, V.; Safonov, A.; Sakumoto, W. K.; Sakurai, Y.; Santi, L.; Sato, K.; Saveliev, V.; Savoy-Navarro, A.; Schlabach, P.; Schmidt, A.; Schmidt, E. E.; Schwarz, Thomas; Scodellaro, L.; Scribano, A.; Scuri, F.; Seidel, S. C.; Seiya, Y.; Semenov, A.; Sforza, F.; Shalhout, S.; Shears, T.; Shepard, P. F.; Shimojima, M.; Shochet, M.; Shreyber-Tecker, I.; Симоненко, А.; Sinervo, P.; Sliwa, K.; Smith, J. R.; Snider, F. D.; Soha, A.; Sorı́n, V.; Song, H.; Squillacioti, P.; Stancari, M.; Denis, R. St.; Stelzer, B.; Stelzer-Chilton, O.; Stentz, D.; Strologas, J.; Strycker, G. L.; Sudo, Y.; Суханов, А.; Suslov, I.; Takemasa, K.; Takeuchi, Y.; Tang, J.; Tecchio, M.; Teng, P. K.; Thom, J.; Thome, J.; Thompson, G. A.; Thomson, E.; Toback, D.; Tokár, S.; Tollefson, K.; Tomura, T.; Tonelli, D.; Torre, S.; Torretta, D.; Totaro, P.; Trovato, M.; Ukegawa, F.; Uozumi, S.; Varganov, A.; Vázquez, F.; Velev, G.; Vellidis, C.; Vidal, M.; Vila, I.; Vilar, R.; Vizán, J.; Vogel, M.; Volpi, G.; Wagner, P.; Wagner, R. L.; Wakisaka, T.; Wallny, R.; Wang, S. M.; Warburton, A.; Waters, D.; Wester, W. C.; Whiteson, D.; Wicklund, A. B.; Wicklund, E.; Wilbur, S.; Wick, F.; Williams, H. H.; Wilson, J. S.; Wilson, P.; Winer, B. L.; Wittich, P.; Wolbers, S.; Wolfe, H.; Wright, T.; Wu, X.; Wu, Z.; Yamamoto, K.; Yamato, D.; Yang, T.; Yang, U. K.; Yu, Yang; Yao, W-M.; Yeh, G. P.; Yi, K.; Yoh, J.; Yorita, K.; Yoshida, T.; Yu, G. B.; Yu, I.; Yu, S. S.; Yun, J. C.; Zanetti, A.; Zeng, Y.; Zhou, C.; Zucchelli, S.

doi:10.1103/physrevlett.109.152003

Cited by 83 publications

(90 citation statements)

References 31 publications

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“…Furthermore, note that there are other interference directions also showing substantial effects, e.g., in the g L -g R plane of the s channel, but the V R g L interference is the most interesting one because it is large in all channels, and respective bounds are expected to remain rather weak also from other experiments along the considered direction 5 Clearly the experimental analysis performed in Ref. [58] to extract À t from data will itself also be affected byg-dependent acceptances as discussed in the course of this paper.…”

Section: Partonic Levelmentioning

confidence: 93%

“…Since À t has already been measured, the most recent bound from D0 being À t ¼ 2:00 þ0:47 À0:43 GeV [58], it is included in our analysis as an additional observable. 5 The numerical results can then be used to test the validity of the polynomial parametrization, Eq. (21a), in the following way: the normalized matrix element response may always be expanded as…”

Section: Partonic Levelmentioning

confidence: 99%

“…One of the major cornerstones was the discovery of the top quark at the Tevatron in 1995 [1,2], confirming the postulated three-family doublet structure of the SM. While the Tevatron experiments have continued to collect data and improve their measurements of top properties, most importantly its mass [3][4][5][6], most attention is now directed to the LHC up and running at ffiffi ffi s p ¼ 8 TeV, and the results of its multipurpose experiments ATLAS and CMS improving on top statistics by the day. By now, top pair production has been measured in different channels with remarkable accuracy [7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

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Anomalous top couplings at hadron colliders revisited

Bach

Ohl

2012

Phys. Rev. D

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In an effective operator approach, the full set of leading contributions to anomalous top couplings comprises various new trilinear as well as higher interaction vertices, some of which are related to one another by gauge symmetry or equations of motion. In order to study trilinear top couplings to Standard Model gauge bosons such as tt, ttZ, tbW and ttg, the operator set can be restricted accordingly. However, the complete basis cannot be mapped onto an on-shell parametrization of the trilinear vertices alone. Four-fermion contact terms qqtt and udtb must be included if the relation to the operator basis is to be retained. In this paper, we point out how these interactions contribute to the single top search channels for anomalous trilinear tbW couplings at the LHC and Tevatron, thus affecting the corresponding bounds. All results are based on full leading-order partonic matrix elements, thus automatically accounting for off-shell and interference effects as well as irreducible backgrounds. A discussion of the quantitative effects of going from on-shell tops to full matrix elements including acceptance cuts is also provided.

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Section: Partonic Levelmentioning

confidence: 93%

Section: Partonic Levelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Anomalous top couplings at hadron colliders revisited

Bach

Ohl

2012

Phys. Rev. D

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“…Observed jet energies are corrected for nonuniformities of the calorimeter response parametrized as a function of , the energy contributed by multiple p " p interactions in the event, and the calorimeter's nonlinear response [17]. In addition to the standard jet-energy corrections, we use an artificial neural network that includes additional information, such as jet momentum from the charged particles inside the jet [13], to improve jet-energy resolution [18,19]. Jets originating from b quarks are identified (tagged) using a secondary-vertex-tagging algorithm [20].…”

mentioning

confidence: 99%

Direct Measurement of the Total Decay Width of the Top Quark

Aaltonen¹,

Amerio²,

Amidei³

et al. 2013

Phys. Rev. Lett.

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We present a measurement of the total decay width of the top quark using events with top-antitop quark pair candidates reconstructed in the final state with one charged lepton and four or more hadronic jets. We use the full Tevatron run II data set of ffiffi ffi s p ¼ The top quark (t) is the heaviest known elementary particle. Its large mass endows it with the largest decay width and, hence, the shortest lifetime of any of the known fermions [1]. At leading order calculation of quantum chromodynamics (QCD), the top quark decay width (À top ) depends on the top quark mass (M top ), the Fermi coupling constant (G F ), and the magnitude of the top-to-bottom quark coupling in the quark-mixing matrix (jV tb j) [2]. The next-to-leading-order calculation with QCD and electroweak corrections predicts À top ¼ 1:33 GeV at M top ¼ 172:5 GeV=c 2 with approximately 1% precision [3,4]. This is consistent with the recent next-to-nextto-leading-order calculation of À top ¼ 1:32 GeV [5]. A deviation from the standard model (SM) prediction could indicate the presence of non-SM decay channels, such as decays through a charged Higgs boson [6], the supersymmetric top quark partner [7], or a flavor-changing neutral current [8]. A direct measurement of À top provides general constraints on such processes.The D0 Collaboration has determined the width to be À top ¼ 2:00 þ0:47 À0:43 GeV in a data set corresponding to an integrated luminosity of 5:4 fb À1 , using a modeldependent, indirect measurement that assumes SM couplings [9]. The CDF Collaboration reported more model-independent measurements of the width using a direct shape comparison of the reconstructed top quark mass in data to the simulated top quark mass distributions [10,11]. The most recent measurement set an upper limit of À top < 7:6 GeV at the 95% confidence level (C.L.) with a data set corresponding to 4:3 fb À1 [11]. Even though the direct measurement is less precise than the indirect one, it probes a broader class of non-SM physics models, because the direct measurement has less dependence on the SM.This Letter reports on a direct measurement of the top quark width in p " p collisions at the Tevatron, using the full run II data set, corresponding to an integrated luminosity of 8:7 fb À1 collected with the CDF II detector [12], which is a general-purpose azimuthally and forward-backward symmetric detector surrounding the colliding beams of the Tevatron p " p collider. We not only increase statistical sensitivity using a larger sample with respect to Ref. [11], but also improve jet-energy calibrations using an artificial neural network [13].Top quarks at the Tevatron are predominantly produced in t " t pairs. We reconstruct top quark decays in the topology PRL 111, 202001 (2013) P H Y S I C A L

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“…The top-quark mass has been determined with a high precision at the Fermilab Tevatron to be m t = 173.18 ± 0.94 GeV from tt events in pp collisions [2]. Measurements have been performed in different top-quark decay channels and using different methods, with the most precise single measurement of m t = 172.85 ± 1.11 GeV being from the CDF Collaboration in the lepton+jets channel using a template method [3]. At the CERN Large Hadron Collider (LHC), the CMS Collaboration has measured the top-quark mass in the dilepton channel [4,5], where the latest measurement with an integrated luminosity of 5.0 fb −1 yields m t = 172.5 ± 1.5 GeV [5].…”

Section: Introductionmentioning

confidence: 99%

Measurement of the top-quark mass in $ \mathrm{t}\overline{\mathrm{t}} $ events with lepton+jets final states in pp collisions at $ \sqrt{s}=7 $ TeV

Chatrchyan¹,

Khachatryan²,

Sirunyan³

et al. 2012

J. High Energ. Phys.

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The mass of the top quark is measured using a sample of tt candidate events with one electron or muon and at least four jets in the final state, collected by CMS in pp collisions at √ s = 7 TeV at the LHC. A total of 5174 candidate events is selected from data corresponding to an integrated luminosity of 5.0 fb −1 . For each event the mass is reconstructed from a kinematic fit of the decay products to a tt hypothesis. The topquark mass is determined simultaneously with the jet energy scale (JES), constrained by the known mass of the W boson in qq decays, to be 173.49±0.43 (stat.+JES)±0.98 (syst.) GeV. Keywords: Hadron-Hadron ScatteringArXiv ePrint: 1209.2319Open Access, Copyright CERN, for the benefit of the CMS collaboration The CMS collaboration 18 IntroductionThe top-quark mass (m t ) is an essential parameter of the standard model. Its measurement also provides an important benchmark for the performance and calibration of the Compact Muon Solenoid (CMS) detector [1]. The top-quark mass has been determined with a high precision at the Fermilab Tevatron to be m t = 173.18 ± 0.94 GeV from tt events in pp collisions [2]. Measurements have been performed in different top-quark decay channels and using different methods, with the most precise single measurement of m t = 172.85 ± 1.11 GeV being from the CDF Collaboration in the lepton+jets channel using a template method [3]. At the CERN Large Hadron Collider (LHC), the CMS Collaboration has measured the top-quark mass in the dilepton channel [4,5], where the latest measurement with an integrated luminosity of 5.0 fb −1 yields m t = 172.5 ± 1.5 GeV [5]. The ATLAS Collaboration has published a measurement in the lepton+jets channel with an integrated luminosity of 1.04 fb −1 , also using a template method, that gives m t = 174.5 ± 2.4 GeV [6].In the analysis presented here, we select events containing top-quark pairs where each top quark decays weakly via t → bW, with one W boson decaying into a charged lepton and its neutrino, and the other into a quark-antiquark (qq) pair. Hence, the final state consists of a lepton, four jets, and an undetected neutrino. The analysis employs a kinematic fit of the decay products to a tt hypothesis and two-dimensional (2D) likelihood functions for each event to estimate simultaneously both the top-quark mass and the jet energy scale -1 - JHEP12(2012)105(JES). The invariant mass of the two jets associated with the W → qq decay serves as an additional observable in the likelihood functions to estimate the JES directly exploiting the precise knowledge of the W-boson mass from previous measurements [7]. The CMS detectorThe central feature of the CMS apparatus is a superconducting solenoid, of 6 m internal diameter, providing a field of 3.8 T. Within the field volume are a silicon pixel and strip tracker, a crystal electromagnetic calorimeter (ECAL) and a brass/scintillator hadron calorimeter (HCAL). Muons are measured in gas-ionization detectors embedded in the steel return yoke.CMS uses a right-handed coordinate system, wit...

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Precision Top-Quark Mass Measurement at CDF

Cited by 83 publications

References 31 publications

Anomalous top couplings at hadron colliders revisited

Anomalous top couplings at hadron colliders revisited

Direct Measurement of the Total Decay Width of the Top Quark

Measurement of the top-quark mass in $ \mathrm{t}\overline{\mathrm{t}} $ events with lepton+jets final states in pp collisions at $ \sqrt{s}=7 $ TeV

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