Abstract
A number of years ago, low-energy constraints on scalar diquarks, particles that couple to two quarks, were examined. It was found that the two most weakly-constrained diquarks are Du and Dd, colour antitriplets that couple to \( {u}_R^i{u}_R^j \) and \( {d}_R^i{d}_R^j \), respectively. These diquarks have not been observed at the LHC. In this paper, we add the LHC measurements to the low-energy analysis, and find that the constraints are significantly improved. As an example, denoting xu as the Du coupling to the first and second generations, for \( {M}_{D^u} \) = 600 GeV, the low-energy constraint is |xu| ≤ 14.4, while the addition of the LHC dijet measurement leads to |xu| ≤ 0.13–0.15. Further improvements are obtained by adding the measurement of single top production with a pT cut. These new constraints must be taken into account in making predictions for other low-energy indirect effects of diquarks.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
D. London, Anomalies in B Decays: A Sign of New Physics?, in 11th International Symposium on Quantum Theory and Symmetries, (2019) [arXiv:1911.06238] [INSPIRE].
J.L. Hewett and T.G. Rizzo, Low-Energy Phenomenology of Superstring Inspired E6 Models, Phys. Rept. 183 (1989) 193 [INSPIRE].
R.N. Mohapatra, N. Okada and H.-B. Yu, Diquark Higgs at LHC, Phys. Rev. D 77 (2008) 011701 [arXiv:0709.1486] [INSPIRE].
R. Barbier et al., R-parity violating supersymmetry, Phys. Rept. 420 (2005) 1 [hep-ph/0406039] [INSPIRE].
H. Tanaka and I. Watanabe, Color sextet quark productions at hadron colliders, Int. J. Mod. Phys. A 7 (1992) 2679 [INSPIRE].
S. Atag, O. Cakir and S. Sultansoy, Resonance production of diquarks at the CERN LHC, Phys. Rev. D 59 (1999) 015008 [INSPIRE].
O. Cakir and M. Sahin, Resonant production of diquarks at high energy pp, ep and e+ e− colliders, Phys. Rev. D 72 (2005) 115011 [hep-ph/0508205] [INSPIRE].
C.-R. Chen, W. Klemm, V. Rentala and K. Wang, Color Sextet Scalars at the CERN Large Hadron Collider, Phys. Rev. D 79 (2009) 054002 [arXiv:0811.2105] [INSPIRE].
T. Han, I. Lewis and T. McElmurry, QCD Corrections to Scalar Diquark Production at Hadron Colliders, JHEP 01 (2010) 123 [arXiv:0909.2666] [INSPIRE].
I. Gogoladze, Y. Mimura, N. Okada and Q. Shafi, Color Triplet Diquarks at the LHC, Phys. Lett. B 686 (2010) 233 [arXiv:1001.5260] [INSPIRE].
E.L. Berger, Q.-H. Cao, C.-R. Chen, G. Shaughnessy and H. Zhang, Color Sextet Scalars in Early LHC Experiments, Phys. Rev. Lett. 105 (2010) 181802 [arXiv:1005.2622] [INSPIRE].
T. Han, I. Lewis and Z. Liu, Colored Resonant Signals at the LHC: Largest Rate and Simplest Topology, JHEP 12 (2010) 085 [arXiv:1010.4309] [INSPIRE].
I. Baldes, N.F. Bell and R.R. Volkas, Baryon Number Violating Scalar Diquarks at the LHC, Phys. Rev. D 84 (2011) 115019 [arXiv:1110.4450] [INSPIRE].
P. Richardson and D. Winn, Simulation of Sextet Diquark Production, Eur. Phys. J. C 72 (2012) 1862 [arXiv:1108.6154] [INSPIRE].
D. Karabacak, S. Nandi and S.K. Rai, Diquark resonance and single top production at the Large Hadron Collider, Phys. Rev. D 85 (2012) 075011 [arXiv:1201.2917] [INSPIRE].
M. Kohda, H. Sugiyama and K. Tsumura, Lepton number violation at the LHC with leptoquark and diquark, Phys. Lett. B 718 (2013) 1436 [arXiv:1210.5622] [INSPIRE].
R.S. Chivukula, P. Ittisamai, K. Mohan and E.H. Simmons, Color discriminant variable and scalar diquarks at the LHC, Phys. Rev. D 92 (2015) 075020 [arXiv:1507.06676] [INSPIRE].
Y.C. Zhan, Z.L. Liu, S.A. Li, C.S. Li and H.T. Li, Threshold resummation for the production of a color sextet (antitriplet) scalar at the LHC, Eur. Phys. J. C 74 (2014) 2716 [arXiv:1305.5152] [INSPIRE].
Z.L. Liu, C.S. Li, Y. Wang, Y.C. Zhan and H.T. Li, Transverse momentum resummation for color sextet and antitriplet scalar production at the LHC, Eur. Phys. J. C 74 (2014) 2771 [arXiv:1307.4341] [INSPIRE].
J. Shu, T.M.P. Tait and K. Wang, Explorations of the Top Quark Forward-Backward Asymmetry at the Tevatron, Phys. Rev. D 81 (2010) 034012 [arXiv:0911.3237] [INSPIRE].
I. Dorsner, S. Fajfer, J.F. Kamenik and N. Kosnik, Light colored scalars from grand unification and the forward-backward asymmetry in \( t\overline{t} \) production, Phys. Rev. D 81 (2010) 055009 [arXiv:0912.0972] [INSPIRE].
I. Dorsner, S. Fajfer, J.F. Kamenik and N. Kosnik, Light Colored Scalar as Messenger of Up-Quark Flavor Dynamics in Grand Unified Theories, Phys. Rev. D 82 (2010) 094015 [arXiv:1007.2604] [INSPIRE].
A. Arhrib, R. Benbrik and C.-H. Chen, Forward-backward asymmetry of top quark in diquark models, Phys. Rev. D 82 (2010) 034034 [arXiv:0911.4875] [INSPIRE].
Z. Ligeti, G. Marques Tavares and M. Schmaltz, Explaining the \( t\overline{t} \) forward-backward asymmetry without dijet or flavor anomalies, JHEP 06 (2011) 109 [arXiv:1103.2757] [INSPIRE].
K. Hagiwara and J. Nakamura, Diquark contributions to Top quark charge asymmetry at the Tevatron and LHC, JHEP 02 (2013) 100 [arXiv:1205.5005] [INSPIRE].
B.C. Allanach and K. Sridhar, R-Parity Violating Supersymmetry Explanation for Large \( t\overline{t} \) Forward-Backward Asymmetry, Phys. Rev. D 86 (2012) 075016 [arXiv:1205.5170] [INSPIRE].
G. Dupuis and J.M. Cline, Top quark forward-backward asymmetry in R-parity violating supersymmetry, JHEP 01 (2013) 058 [arXiv:1206.1845] [INSPIRE].
C. Han, N. Liu, L. Wu, J.M. Yang and Y. Zhang, Two-Higgs-doublet model with a color-triplet scalar: a joint explanation for top quark forward-backward asymmetry and Higgs decay to diphoton, Eur. Phys. J. C 73 (2013) 2664 [arXiv:1212.6728] [INSPIRE].
R.N. Mohapatra and R.E. Marshak, Local B-L Symmetry of Electroweak Interactions, Majorana Neutrinos and Neutron Oscillations, Phys. Rev. Lett. 44 (1980) 1316 [Erratum ibid. 44 (1980) 1643] [INSPIRE].
K.S. Babu, P.S. Bhupal Dev and R.N. Mohapatra, Neutrino mass hierarchy, neutron-antineutron oscillation from baryogenesis, Phys. Rev. D 79 (2009) 015017 [arXiv:0811.3411] [INSPIRE].
M. Ajaib, I. Gogoladze, Y. Mimura and Q. Shafi, Observable n-\( \overline{n} \) Oscillations with New Physics at LHC, Phys. Rev. D 80 (2009) 125026 [arXiv:0910.1877] [INSPIRE].
P.-H. Gu and U. Sarkar, Baryogenesis and neutron-antineutron oscillation at TeV, Phys. Lett. B 705 (2011) 170 [arXiv:1107.0173] [INSPIRE].
K.S. Babu and R.N. Mohapatra, Coupling Unification, GUT-Scale Baryogenesis and Neutron-Antineutron Oscillation in SO(10), Phys. Lett. B 715 (2012) 328 [arXiv:1206.5701] [INSPIRE].
J.M. Arnold, B. Fornal and M.B. Wise, Simplified models with baryon number violation but no proton decay, Phys. Rev. D 87 (2013) 075004 [arXiv:1212.4556] [INSPIRE].
K.S. Babu, P.S. Bhupal Dev, E.C.F.S. Fortes and R.N. Mohapatra, Post-Sphaleron Baryogenesis and an Upper Limit on the Neutron-Antineutron Oscillation Time, Phys. Rev. D 87 (2013) 115019 [arXiv:1303.6918] [INSPIRE].
N.B. Beaudry, A. Datta, D. London, A. Rashed and J.-S. Roux, The B → πK puzzle revisited, JHEP 01 (2018) 074 [arXiv:1709.07142] [INSPIRE].
C.-H. Chen and T. Nomura, Left-handed color-sextet diquark in the Kaon system, Phys. Rev. D 99 (2019) 115006 [arXiv:1811.02315] [INSPIRE].
P.S.B. Dev, R. Mohanta, S. Patra and S. Sahoo, Unified explanation of flavor anomalies, radiative neutrino mass and ANITA anomalous events in a vector leptoquark model, arXiv:2004.09464 [INSPIRE].
G.F. Giudice, B. Gripaios and R. Sundrum, Flavourful Production at Hadron Colliders, JHEP 08 (2011) 055 [arXiv:1105.3161] [INSPIRE].
G. Bhattacharyya, D. Choudhury and K. Sridhar, New LEP bounds on B violating scalar couplings: R-parity violating supersymmetry or diquarks, Phys. Lett. B 355 (1995) 193 [hep-ph/9504314] [INSPIRE].
E.C.F.S. Fortes, K.S. Babu and R.N. Mohapatra, Flavor Physics Constraints on TeV Scale Color Sextet Scalars, in 6th International Workshop on Charm Physics, 11, 2013 [arXiv:1311.4101] [INSPIRE].
N. Assad, B. Fornal and B. Grinstein, Baryon Number and Lepton Universality Violation in Leptoquark and Diquark Models, Phys. Lett. B 777 (2018) 324 [arXiv:1708.06350] [INSPIRE].
CMS collaboration, Search for narrow and broad dijet resonances in proton-proton collisions at \( \sqrt{s} \) = 13 TeV and constraints on dark matter mediators and other new particles, JHEP 08 (2018) 130 [arXiv:1806.00843] [INSPIRE].
J. Alwall et al., The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations, JHEP 07 (2014) 079 [arXiv:1405.0301] [INSPIRE].
A. Alloul, N.D. Christensen, C. Degrande, C. Duhr and B. Fuks, FeynRules 2.0 — A complete toolbox for tree-level phenomenology, Comput. Phys. Commun. 185 (2014) 2250 [arXiv:1310.1921] [INSPIRE].
J. Alwall and C. Duhr, Triplet diquark model, https://feynrules.irmp.ucl.ac.be/wiki/Triplets.
J. Pumplin, D.R. Stump, J. Huston, H.L. Lai, P.M. Nadolsky and W.K. Tung, New generation of parton distributions with uncertainties from global QCD analysis, JHEP 07 (2002) 012 [hep-ph/0201195] [INSPIRE].
D. Stolarski and A. Tonero, Constraining New Physics with Single Top production at LHC, arXiv:2004.07856 [INSPIRE].
ATLAS collaboration, Fiducial, total and differential cross-section measurements of t-channel single top-quark production in pp collisions at 8 TeV using data collected by the ATLAS detector, Eur. Phys. J. C 77 (2017) 531 [arXiv:1702.02859] [INSPIRE].
CMS collaboration, Measurement of the single top quark and antiquark production cross sections in the t channel and their ratio in proton-proton collisions at \( \sqrt{s} \) = 13 TeV, Phys. Lett. B 800 (2020) 135042 [arXiv:1812.10514] [INSPIRE].
LHC Top Working Group, https://twiki.cern.ch/twiki/bin/view/LHCPhysics/LHCTopWGSummaryPlots.
ATLAS-CMS recommended predictions for single-top cross sections using the Hathor v2.1 program, https://twiki.cern.ch/twiki/bin/view/LHCPhysics/SingleTopRefXsec.
M. Aliev, H. Lacker, U. Langenfeld, S. Moch, P. Uwer and M. Wiedermann, HATHOR: HAdronic Top and Heavy quarks crOss section calculatoR, Comput. Phys. Commun. 182 (2011) 1034 [arXiv:1007.1327] [INSPIRE].
P. Kant et al., HatHor for single top-quark production: Updated predictions and uncertainty estimates for single top-quark production in hadronic collisions, Comput. Phys. Commun. 191 (2015) 74 [arXiv:1406.4403] [INSPIRE].
M. Botje et al., The PDF4LHC Working Group Interim Recommendations, arXiv:1101.0538 [INSPIRE].
A.D. Martin, W.J. Stirling, R.S. Thorne and G. Watt, Parton distributions for the LHC, Eur. Phys. J. C 63 (2009) 189 [arXiv:0901.0002] [INSPIRE].
A.D. Martin, W.J. Stirling, R.S. Thorne and G. Watt, Uncertainties on αs in global PDF analyses and implications for predicted hadronic cross sections, Eur. Phys. J. C 64 (2009) 653 [arXiv:0905.3531] [INSPIRE].
H.-L. Lai et al., New parton distributions for collider physics, Phys. Rev. D 82 (2010) 074024 [arXiv:1007.2241] [INSPIRE].
R.D. Ball et al., Parton distributions with LHC data, Nucl. Phys. B 867 (2013) 244 [arXiv:1207.1303] [INSPIRE].
ATLAS collaboration, private communication.
Open Access
This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited
Author information
Authors and Affiliations
Corresponding author
Additional information
Publisher’s Note
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
ArXiv ePrint: 2006.13385
Rights and permissions
Open Access . This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.
About this article
Cite this article
Pascual-Dias, B., Saha, P. & London, D. LHC constraints on scalar diquarks. J. High Energ. Phys. 2020, 144 (2020). https://doi.org/10.1007/JHEP07(2020)144
Received:
Accepted:
Published:
DOI: https://doi.org/10.1007/JHEP07(2020)144