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Journal articles on the topic 'LHC CMS Charge asymmetry top quark'

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Author: Grafiati

Published: 10 December 2022

Last updated: 28 January 2023

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1

Chwalek, Thorsten, and Frédéric Déliot. "Top Quark Asymmetries." Universe 8, no. 12 (November 25, 2022): 622. http://dx.doi.org/10.3390/universe8120622.

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The production of top quark pairs (tt¯) via the quark-antiquark initial state is not symmetric under the exchange of top quark and antiquark. Calculations of this next-to-leading order effect predict asymmetries of about one to a few percent, depending on the centre-of-mass energy and the selected phase space. Experimentally, this charge asymmetry of tt¯ production manifests itself in differences in angular distributions between top quarks and antiquarks. Sensitive observables are the rapidities of the produced top quarks and antiquarks as well as their energies. In dileptonic tt¯ events, the asymmetry of the tt¯ system is reflected in a similar asymmetry in the system of the produced lepton pair, with the crucial advantage of a simpler reconstruction procedure. In this article we review the measurements of this effect in different final states and using different observables by the ATLAS and CMS Collaborations in LHC collisions at three different centre-of-mass energies.

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2

SCHILLING, FRANK-PETER. "TOP QUARK PHYSICS AT THE LHC: A REVIEW OF THE FIRST TWO YEARS." International Journal of Modern Physics A 27, no. 17 (June 26, 2012): 1230016. http://dx.doi.org/10.1142/s0217751x12300165.

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This review summarizes the highlights in the area of top quark physics obtained with the two general purpose detectors ATLAS and CMS during the first two years of operation of the Large Hadron Collider (LHC). It covers the 2010 and 2011 data taking periods, where the LHC provided pp collisions at a center-of-mass energy of [Formula: see text]. Measurements are presented of the total and differential top quark pair production cross-section in many different channels, the top quark mass and various other properties of the top quark and its interactions, for instance the charge asymmetry. Measurements of single top quark production and various searches for new physics involving top quarks are also discussed. The already very precise experimental data are in good agreement with the standard model (SM).

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3

Del Duca, Vittorio, and Eric Laenen. "Top physics at the LHC." International Journal of Modern Physics A 30, no. 35 (December 20, 2015): 1530063. http://dx.doi.org/10.1142/s0217751x1530063x.

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We review the present situation in top quark physics, in these early days of Run II of the LHC. We take mostly a Standard Model perspective, showing recent results, and review the key concepts and results of the associated theoretical predictions. The issues we discuss are the top quark mass, top quark pair and single top production, production in association with other particles, charge asymmetry and top quark decay.

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4

Shaw, Kate. "Top Quark Charge Asymmetry Measurement with ATLAS at the LHC." Journal of Physics: Conference Series 452 (July 30, 2013): 012058. http://dx.doi.org/10.1088/1742-6596/452/1/012058.

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5

Maltoni, F., M. L. Mangano, I. Tsinikos, and M. Zaro. "Top-quark charge asymmetry and polarization intt¯W±production at the LHC." Physics Letters B 736 (September 2014): 252–60. http://dx.doi.org/10.1016/j.physletb.2014.07.033.

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6

Rubbo, Francesco. "Top quark pair properties: spin correlation, charge asymmetry and complex final states at LHC in ATLAS." EPJ Web of Conferences 60 (2013): 16013. http://dx.doi.org/10.1051/epjconf/20136016013.

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7

Alvarez, Ezequiel, Aurelio Juste, Manuel Szewc, and Tamara Vazquez Schroeder. "Topping-up multilepton plus b-jets anomalies at the LHC with a Z′ boson." Journal of High Energy Physics 2021, no. 5 (May 2021). http://dx.doi.org/10.1007/jhep05(2021)125.

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Abstract During the last years ATLAS and CMS have reported a number of slight to mild discrepancies in signatures of multileptons plus b-jets in analyses such as $$ t\overline{t}H $$ t t ¯ H , $$ t\overline{t}{W}^{\pm } $$ t t ¯ W ± , $$ t\overline{t}Z $$ t t ¯ Z and $$ t\overline{t}t\overline{t} $$ t t ¯ t t ¯ . Among them, a recent ATLAS result on $$ t\overline{t}H $$ t t ¯ H production has also reported an excess in the charge asymmetry in the same-sign dilepton channel with two or more b-tagged jets. Motivated by these tantalizing discrepancies, we study a phenomenological New Physics model consisting of a Z′ boson that couples to up-type quarks via right-handed currents: $$ {t}_R{\gamma}^{\mu }{\overline{t}}_R $$ t R γ μ t ¯ R , $$ {t}_R{\gamma}^{\mu }{\overline{c}}_R $$ t R γ μ c ¯ R , and $$ {t}_R{\gamma}^{\mu }{\overline{u}}_R $$ t R γ μ u ¯ R . The latter vertex allows to translate the charge asymmetry at the LHC initial state protons to a final state with top quarks which, decaying to a positive lepton and a b-jet, provides a crucial contribution to some of the observed discrepancies. Through an analysis at a detector level, we select the region in parameter space of our model that best reproduces the data in the aforementioned $$ t\overline{t}H $$ t t ¯ H study, and in a recent ATLAS $$ t\overline{t}t\overline{t} $$ t t ¯ t t ¯ search. We find that our model provides a better fit to the experimental data than the Standard Model for a New Physics scale of approximately ∼500 GeV, and with a hierarchical coupling of the Z′ boson that favours the top quark and the presence of FCNC currents. In order to estimate the LHC sensitivity to this signal, we design a broadband search featuring many kinematic regions with different signal-to-background ratio, and perform a global analysis. We also define signal-enhanced regions and study observables that could further distinguish signal from background. We find that the region in parameter space of our model that best fits the analysed data could be probed with a significance exceeding 3 standard deviations with just the full Run-2 dataset.

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8

Knapen, Simon, Yue Zhao, and Matthew J. Strassler. "Diagnosing the top-quark angular asymmetry using LHC intrinsic charge asymmetries." Physical Review D 86, no. 1 (July 12, 2012). http://dx.doi.org/10.1103/physrevd.86.014013.

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9

Hagiwara, Kaoru, and Junya Nakamura. "Diquark contributions to top quark charge asymmetry at the Tevatron and LHC." Journal of High Energy Physics 2013, no. 2 (February 2013). http://dx.doi.org/10.1007/jhep02(2013)100.

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10

Tumasyan, A., W. Adam, J. W. Andrejkovic, T. Bergauer, S. Chatterjee, M. Dragicevic, A. Escalante Del Valle, et al. "Search for single production of a vector-like T quark decaying to a top quark and a Z boson in the final state with jets and missing transverse momentum at $$ \sqrt{s} $$ = 13 TeV." Journal of High Energy Physics 2022, no. 5 (May 2022). http://dx.doi.org/10.1007/jhep05(2022)093.

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Abstract A search is presented for single production of a vector-like T quark with charge 2/3 e, in the decay channel featuring a top quark and a Z boson, with the top quark decaying hadronically and the Z boson decaying to neutrinos. The search uses data collected by the CMS experiment in proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 137 fb−1 recorded at the CERN LHC in 2016–2018. The search is sensitive to a T quark mass between 0.6 and 1.8 TeV with decay widths ranging from negligibly small up to 30% of the T quark mass. Reconstruction strategies for the top quark are based on the degree of Lorentz boosting of its final state. At 95% confidence level, the upper limit on the product of the cross section and branching fraction for a T quark of small decay width varies between 15 and 602 fb, depending on its mass. For a T quark with decay widths between 10 and 30% of its mass, this upper limit ranges between 16 and 836 fb. For most of the studied range, the results provide the best limits to date. This is the first search for single T quark production based on the full Run 2 data set of the LHC.

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11

Czakon, Michał, David Heymes, Alexander Mitov, Davide Pagani, Ioannis Tsinikos, and Marco Zaro. "Top-quark charge asymmetry at the LHC and Tevatron through NNLO QCD and NLO EW." Physical Review D 98, no. 1 (July 5, 2018). http://dx.doi.org/10.1103/physrevd.98.014003.

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12

Tumasyan, A., W. Adam, J. W. Andrejkovic, T. Bergauer, S. Chatterjee, M. Dragicevic, A. Escalante Del Valle, et al. "Measurement of the top quark mass using events with a single reconstructed top quark in pp collisions at $$ \sqrt{s} $$ = 13 TeV." Journal of High Energy Physics 2021, no. 12 (December 2021). http://dx.doi.org/10.1007/jhep12(2021)161.

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Abstract A measurement of the top quark mass is performed using a data sample enriched with single top quark events produced in the t channel. The study is based on proton- proton collision data, corresponding to an integrated luminosity of 35.9 fb−1, recorded at $$ \sqrt{s} $$ s = 13 TeV by the CMS experiment at the LHC in 2016. Candidate events are selected by requiring an isolated high-momentum lepton (muon or electron) and exactly two jets, of which one is identified as originating from a bottom quark. Multivariate discriminants are designed to separate the signal from the background. Optimized thresholds are placed on the discriminant outputs to obtain an event sample with high signal purity. The top quark mass is found to be $$ {172.13}_{-0.77}^{+0.76} $$ 172.13 − 0.77 + 0.76 GeV, where the uncertainty includes both the statistical and systematic components, reaching sub-GeV precision for the first time in this event topology. The masses of the top quark and antiquark are also determined separately using the lepton charge in the final state, from which the mass ratio and difference are determined to be $$ {0.9952}_{-0.0104}^{+0.0079} $$ 0.9952 − 0.0104 + 0.0079 and $$ {0.83}_{-1.35}^{+1.79} $$ 0.83 − 1.35 + 1.79 GeV, respectively. The results are consistent with CPT invariance.

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13

Wang, Sheng-Quan, Xing-Gang Wu, Zong-Guo Si, and Stanley J. Brodsky. "Application of the principle of maximum conformality to the top-quark charge asymmetry at the LHC." Physical Review D 90, no. 11 (December 29, 2014). http://dx.doi.org/10.1103/physrevd.90.114034.

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14

Corcella, Gennaro, Antonio Costantini, Margherita Ghezzi, Luca Panizzi, Giovanni Marco Pruna, and Jakub Šalko. "Vector-like quarks decaying into singly and doubly charged bosons at LHC." Journal of High Energy Physics 2021, no. 10 (October 2021). http://dx.doi.org/10.1007/jhep10(2021)108.

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Abstract We investigate the production of vector-like quarks with charge 5/3 at the LHC and their subsequent decays into new singly or doubly charged bosons plus a heavy quark (top or bottom). In particular, we explore final states with same-sign di-leptons (electron or muon pairs), with the leptons coming from the decay of the new bosons and, in the case of production of singly charged bosons, from top quarks as well. These processes are predicted by classes of models based on extensions of the gauge group of the Standard Model, such as the 331 Model, where the electroweak symmetry is described by SU(3)L × U(1)X, X being a new abelian charge. For this purpose, a CMS search for vector-like partners with charge 5/3 decaying into Wt is recast to obtain model-independent bounds and projected reaches at future luminosity stages of the LHC. The results are then interpreted as mass bounds for the new particles predicted in the 331 Model and as a constraint on the scale of its spontaneous symmetry breaking. The complete set of model-independent results are provided as recast efficiencies, to allow for reinterpretation in different scenarios.

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15

Bergner, Jonas, and Markus Schulze. "The top quark charge asymmetry in $$t{\bar{t}}\gamma $$ t t ¯ γ production at the LHC." European Physical Journal C 79, no. 3 (March 2019). http://dx.doi.org/10.1140/epjc/s10052-019-6707-6.

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16

Bevilacqua, Giuseppe, Huan-Yu Bi, Heribertus Bayu Hartanto, Manfred Kraus, Jasmina Nasufi, and Malgorzata Worek. "NLO QCD corrections to off-shell $${t{\bar{t}}W^\pm }$$ production at the LHC: correlations and asymmetries." European Physical Journal C 81, no. 7 (July 2021). http://dx.doi.org/10.1140/epjc/s10052-021-09478-x.

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AbstractRecent discrepancies between theoretical predictions and experimental data in multi-lepton plus b-jets analyses for the $$t{\bar{t}}W^\pm $$ t t ¯ W ± process, as reported by the ATLAS collaboration, have indicated that more accurate theoretical predictions and high precision observables are needed to constrain numerous new physics scenarios in this channel. To this end we employ NLO QCD computations with full off-shell top quark effects included to provide theoretical predictions for the $$\mathcal{R}= \sigma _{t{\bar{t}}W^+}/\sigma _{t{\bar{t}}W^-}$$ R = σ t t ¯ W + / σ t t ¯ W - cross section ratio at the LHC with $$\sqrt{s}=13$$ s = 13 TeV. Depending on the transverse momentum cut on the b-jet we obtain 2–3% theoretical precision on $$\mathcal{R}$$ R , which should help to shed some light on new physics effects that can reveal themselves only once sufficiently precise Standard Model theoretical predictions are available. Furthermore, triggered by these discrepancies we reexamine the charge asymmetry of the top quark and its decay products in the $$t{\bar{t}}W^\pm $$ t t ¯ W ± production process. In the case of charge asymmetries, that are uniquely sensitive to the chiral nature of possible new physics in this channel, theoretical uncertainties below 15% are obtained. Additionally, the impact of the top quark decay modelling is scrutinised by explicit comparison with predictions in the narrow-width approximation.

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17

Gabrielli, Emidio, Antonio Racioppi, and Martti Raidal. "Implications of the effective axial-vector coupling of the gluon on top-quark charge asymmetry at the LHC." Physical Review D 85, no. 7 (April 18, 2012). http://dx.doi.org/10.1103/physrevd.85.074021.

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18

Alte, Stefan, Stefan Berge, and Hubert Spiesberger. "Top quark charge asymmetry: searching for light axigluons in t t ¯ $$ t\overline{t} $$ + jet production at the LHC." Journal of High Energy Physics 2014, no. 9 (September 2014). http://dx.doi.org/10.1007/jhep09(2014)084.

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19

Sirunyan, A. M., A. Tumasyan, W. Adam, T. Bergauer, M. Dragicevic, A. Escalante Del Valle, R. Frühwirth, et al. "Search for new physics in top quark production with additional leptons in proton-proton collisions at $$ \sqrt{s} $$ = 13 TeV using effective field theory." Journal of High Energy Physics 2021, no. 3 (March 2021). http://dx.doi.org/10.1007/jhep03(2021)095.

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Abstract Events containing one or more top quarks produced with additional prompt leptons are used to search for new physics within the framework of an effective field theory (EFT). The data correspond to an integrated luminosity of 41.5 fb−1 of proton-proton collisions at a center-of-mass energy of 13 TeV at the LHC, collected by the CMS experiment in 2017. The selected events are required to have either two leptons with the same charge or more than two leptons; jets, including identified bottom quark jets, are also required, and the selected events are divided into categories based on the multiplicities of these objects. Sixteen dimension-six operators that can affect processes involving top quarks produced with additional charged leptons are considered in this analysis. Constructed to target EFT effects directly, the analysis applies a novel approach in which the observed yields are parameterized in terms of the Wilson coefficients (WCs) of the EFT operators. A simultaneous fit of the 16 WCs to the data is performed and two standard deviation confidence intervals for the WCs are extracted; the standard model expectations for the WC values are within these intervals for all of the WCs probed.

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