Abstract
We propose a model independent approach for the analysis of interference effects in the process of QCD pair production of new heavy quarks of different species that decay into Standard Model particles, including decays via flavour changing neutral currents. By adopting as ansatz a simple analytical formula we show that one can accurately describe the interference between two different such particle pairs leading to the same final state using information about masses, total widths and couplings. A study of the effects on differential distributions is also performed showing that, when interference plays a relevant role, the distributions of the full process can be obtained by a simple rescaling of the distributions of either quark contributing to the interference term. We also present the range of validity of the analytical expression that we have found.
Article PDF
Similar content being viewed by others
References
ATLAS collaboration, Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC, Phys. Lett. B 716 (2012) 1 [arXiv:1207.7214] [INSPIRE].
CMS collaboration, Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC, Phys. Lett. B 716 (2012) 30 [arXiv:1207.7235] [INSPIRE].
A. Djouadi and A. Lenz, Sealing the fate of a fourth generation of fermions, Phys. Lett. B 715 (2012) 310 [arXiv:1204.1252] [INSPIRE].
O. Eberhardt et al., Impact of a Higgs boson at a mass of 126 GeV on the standard model with three and four fermion generations, Phys. Rev. Lett. 109 (2012) 241802 [arXiv:1209.1101] [INSPIRE].
B.A. Dobrescu and C.T. Hill, Electroweak symmetry breaking via top condensation seesaw, Phys. Rev. Lett. 81 (1998) 2634 [hep-ph/9712319] [INSPIRE].
R.S. Chivukula, B.A. Dobrescu, H. Georgi and C.T. Hill, Top quark seesaw theory of electroweak symmetry breaking, Phys. Rev. D 59 (1999) 075003 [hep-ph/9809470] [INSPIRE].
H.-J. He, C.T. Hill and T.M.P. Tait, Top quark seesaw, vacuum structure and electroweak precision constraints, Phys. Rev. D 65 (2002) 055006 [hep-ph/0108041] [INSPIRE].
C.T. Hill and E.H. Simmons, Strong dynamics and electroweak symmetry breaking, Phys. Rept. 381 (2003) 235 [Erratum ibid. 390 (2004) 553-554] [hep-ph/0203079] [INSPIRE].
K. Agashe, R. Contino and A. Pomarol, The minimal composite Higgs model, Nucl. Phys. B 719 (2005) 165 [hep-ph/0412089] [INSPIRE].
R. Contino, L. Da Rold and A. Pomarol, Light custodians in natural composite Higgs models, Phys. Rev. D 75 (2007) 055014 [hep-ph/0612048] [INSPIRE].
R. Barbieri, B. Bellazzini, V.S. Rychkov and A. Varagnolo, The Higgs boson from an extended symmetry, Phys. Rev. D 76 (2007) 115008 [arXiv:0706.0432] [INSPIRE].
C. Anastasiou, E. Furlan and J. Santiago, Realistic Composite Higgs Models, Phys. Rev. D 79 (2009) 075003 [arXiv:0901.2117] [INSPIRE].
N. Arkani-Hamed, A.G. Cohen, E. Katz and A.E. Nelson, The Littlest Higgs, JHEP 07 (2002) 034 [hep-ph/0206021] [INSPIRE].
M. Schmaltz and D. Tucker-Smith, Little Higgs review, Ann. Rev. Nucl. Part. Sci. 55 (2005) 229 [hep-ph/0502182] [INSPIRE].
A. Davidson and K.C. Wali, Family Mass Hierarchy From Universal Seesaw Mechanism, Phys. Rev. Lett. 60 (1988) 1813 [INSPIRE].
K.S. Babu and R.N. Mohapatra, A solution to the strong CP problem without an axion, Phys. Rev. D 41 (1990) 1286 [INSPIRE].
B. Grinstein, M. Redi and G. Villadoro, Low Scale Flavor Gauge Symmetries, JHEP 11 (2010) 067 [arXiv:1009.2049] [INSPIRE].
D. Guadagnoli, R.N. Mohapatra and I. Sung, Gauged Flavor Group with Left-Right Symmetry, JHEP 04 (2011) 093 [arXiv:1103.4170] [INSPIRE].
T. Moroi and Y. Okada, Radiative corrections to Higgs masses in the supersymmetric model with an extra family and antifamily, Mod. Phys. Lett. A 7 (1992) 187 [INSPIRE].
T. Moroi and Y. Okada, Upper bound of the lightest neutral Higgs mass in extended supersymmetric Standard Models, Phys. Lett. B 295 (1992) 73 [INSPIRE].
K.S. Babu, I. Gogoladze, M.U. Rehman and Q. Shafi, Higgs Boson Mass, Sparticle Spectrum and Little Hierarchy Problem in Extended MSSM, Phys. Rev. D 78 (2008) 055017 [arXiv:0807.3055] [INSPIRE].
S.P. Martin, Extra vector-like matter and the lightest Higgs scalar boson mass in low-energy supersymmetry, Phys. Rev. D 81 (2010) 035004 [arXiv:0910.2732] [INSPIRE].
P.W. Graham, A. Ismail, S. Rajendran and P. Saraswat, A little solution to the little hierarchy problem: a vector-like generation, Phys. Rev. D 81 (2010) 055016 [arXiv:0910.3020] [INSPIRE].
S.P. Martin, Raising the Higgs mass with Yukawa couplings for isotriplets in vector-like extensions of minimal supersymmetry, Phys. Rev. D 82 (2010) 055019 [arXiv:1006.4186] [INSPIRE].
J.L. Rosner, E6 and Exotic Fermions, Comments Nucl. Part. Phys. 15 (1986) 195 [INSPIRE].
R.W. Robinett, On the Mixing and Production of Exotic Fermions in E6, Phys. Rev. D 33 (1986) 1908 [INSPIRE].
J.A. Aguilar-Saavedra, Identifying top partners at LHC, JHEP 11 (2009) 030 [arXiv:0907.3155] [INSPIRE].
Y. Okada and L. Panizzi, LHC signatures of vector-like quarks, Adv. High Energy Phys. 2013 (2013) 364936 [arXiv:1207.5607] [INSPIRE].
A. De Simone, O. Matsedonskyi, R. Rattazzi and A. Wulzer, A First Top Partner Hunter’s Guide, JHEP 04 (2013) 004 [arXiv:1211.5663] [INSPIRE].
F. del Aguila and M.J. Bowick, The Possibility of New Fermions With ΔI = 0 Mass, Nucl. Phys. B 224 (1983) 107 [INSPIRE].
F. del Aguila, M. Pérez-Victoria and J. Santiago, Observable contributions of new exotic quarks to quark mixing, JHEP 09 (2000) 011 [hep-ph/0007316] [INSPIRE].
M. Buchkremer, G. Cacciapaglia, A. Deandrea and L. Panizzi, Model Independent Framework for Searches of Top Partners, Nucl. Phys. B 876 (2013) 376 [arXiv:1305.4172] [INSPIRE].
J.A. Aguilar-Saavedra, R. Benbrik, S. Heinemeyer and M. Pérez-Victoria, Handbook of vectorlike quarks: Mixing and single production, Phys. Rev. D 88 (2013) 094010 [arXiv:1306.0572] [INSPIRE].
D. Barducci, A. Belyaev, M. Buchkremer, S. Moretti, L. Panizzi and H. Prager, Interference effects in QCD pair production of heavy quarks at the LHC: the role of loop mixing, work in progress.
ATLAS collaboration, Search for single b*-quark production with the ATLAS detector at \( \sqrt{s} \) = 7 TeV, Phys. Lett. B 721 (2013) 171 [arXiv:1301.1583] [INSPIRE].
J. Alwall, M. Herquet, F. Maltoni, O. Mattelaer and T. Stelzer, MadGraph 5: Going Beyond, JHEP 06 (2011) 128 [arXiv:1106.0522] [INSPIRE].
A. Belyaev, N.D. Christensen and A. Pukhov, CalcHEP 3.4 for collider physics within and beyond the Standard Model, Comput. Phys. Commun. 184 (2013) 1729 [arXiv:1207.6082] [INSPIRE].
G. Brooijmans et al., Les Houches 2011: Physics at TeV Colliders New Physics Working Group Report, arXiv:1203.1488 [INSPIRE].
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
ArXiv ePrint: 1311.3977
Rights and permissions
Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0), which permits use, duplication, adaptation, distribution, and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
About this article
Cite this article
Barducci, D., Belyaev, A., Blamey, J. et al. Towards model-independent approach to the analysis of interference effects in pair production of new heavy quarks. J. High Energ. Phys. 2014, 142 (2014). https://doi.org/10.1007/JHEP07(2014)142
Received:
Revised:
Accepted:
Published:
DOI: https://doi.org/10.1007/JHEP07(2014)142