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Journal articles on the topic 'Electroweak Singlet'

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Author: Grafiati
Published: 10 March 2023

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1

Bander, Myron. "Electroweak constraints on heavy singlet quarks." Physics Letters B 277, no. 4 (March 1992): 509–11. http://dx.doi.org/10.1016/0370-2693(92)91819-u.

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2

Espinosa, J. R., and M. Quirós. "The electroweak phase transition with a singlet." Physics Letters B 305, no. 1-2 (May 1993): 98–105. http://dx.doi.org/10.1016/0370-2693(93)91111-y.

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3

Cline, James M. "Is electroweak baryogenesis dead?" Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 376, no. 2114 (January 22, 2018): 20170116. http://dx.doi.org/10.1098/rsta.2017.0116.

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Electroweak baryogenesis is severely challenged in its traditional settings: the minimal supersymmetric standard model, and in more general two Higgs doublet models. Fine tuning of parameters is required, or large couplings leading to a Landau pole at scales just above the new physics introduced. The situation is somewhat better in models with a singlet scalar coupling to the Higgs so as to give a strongly first-order phase transition due to a tree-level barrier, but even in this case no UV complete models had been demonstrated to give successful baryogenesis. Here, we point out some directions that overcome this limitation, by introducing a new source of particle–antiparticle (CP) violation in the couplings of the singlet field. A model of electroweak baryogenesis requiring no fine tuning and consistent to scales far above 1 TeV is demonstrated, in which dark matter plays the leading role in creating a CP asymmetry that is the source of the baryon asymmetry. This article is part of the Theo Murphy meeting issue ‘Higgs cosmology’.
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4

TSAI, S. Y. "SIMPSON’S 17 keV NEUTRINO IN MINIMALLY EXTENDED SU(2)L×U(1) ELECTROWEAK MODELS." International Journal of Modern Physics A 07, no. 22 (September 10, 1992): 5625–35. http://dx.doi.org/10.1142/s0217751x92002556.

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It is shown that the standard SU(2) L× U(1) electroweak gauge model extended so as to incorporate a single right-handed neutrino singlet and a second Higgs doublet, supplemented with the singlet majoron hypothesis, can accommodate Simpson’s 17 keV neutrino in a rather unique way. A number of interesting phenomenological consequences follow from such a scheme, which are discussed.
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5

Matsui, Toshinori. "Gravitational waves from the first order electroweak phase transition in the Z3 symmetric singlet scalar model." EPJ Web of Conferences 168 (2018): 05001. http://dx.doi.org/10.1051/epjconf/201816805001.

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Among various scenarios of baryon asymmetry of the Universe, electroweak baryogenesis is directly connected with physics of the Higgs sector. We discuss spectra of gravitational waves which are originated by the strongly first order phase transition at the electroweak symmetry breaking, which is required for a successful scenario of electroweak baryogenesis. In the Z3 symmetric singlet scalar model, the significant gravitational waves are caused by the multi-step phase transition. We show that the model can be tested by measuring the characteristic spectra of the gravitational waves at future interferometers such as LISA and DECIGO.
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6

RAJPOOT, SUBHASH. "ELECTROWEAK INTERACTIONS WITH CHIRAL HYPERCHARGES." Modern Physics Letters A 05, no. 27 (October 30, 1990): 2241–45. http://dx.doi.org/10.1142/s0217732390002559.

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We consider an extension of the electroweak gauge interactions from SU (2) L × U (1)Y to SU (2) L × U (1) L × U (1) R . This extension is motivated by the observed structure of the quarks and leptons, i.e., they form left-handed doublets and right-handed singlets eigenstates of electroweak interactions. In this new extension, the U (1) R serves only the right-handed singlet fermions. Consistent with the measurements of the mass of the standard massive neutral boson Z0 at the SLAC and CERN colliders and the neutral current couplings involving neutrinos and electrons, the additional massive neutral gauge boson can be as light as a few hundred GeV. The model employs the generalized see-saw mechanism to give masses to all the fermions of the theory.
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7

Profumo, Stefano, Michael J. Ramsey-Musolf, and Gabe Shaughnessy. "Singlet Higgs phenomenology and the electroweak phase transition." Journal of High Energy Physics 2007, no. 08 (August 3, 2007): 010. http://dx.doi.org/10.1088/1126-6708/2007/08/010.

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8

Kobakhidze, Archil, Lei Wu, and Jason Yue. "Electroweak Baryogenesis with Anomalous Higgs Couplings." International Journal of Modern Physics: Conference Series 43 (January 2016): 1660200. http://dx.doi.org/10.1142/s2010194516602003.

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In non-linear realisation of the electroweak gauge symmetry, the LHC Higgs boson can be assumed to be a singlet under [Formula: see text]. In such scenario, the Standard Model particle content can be kept but new sets of couplings are allowed. We identify a range of anomalous Higgs cubic and the [Formula: see text]-violating Higgs-top quark couplings that leads to first order phase transition and successful baryogenesis at the electroweak scale.
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9

KRASNIKOV, N. V. "INFLUENCE OF SU(2) ⊗ U(1) SINGLET SCALARS ON HIGGS BOSON SIGNAL AT LHC." Modern Physics Letters A 13, no. 11 (April 10, 1998): 893–98. http://dx.doi.org/10.1142/s0217732398000978.

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We investigate a model of SU(2) ⊗ U(1) singlet scalars coupled to Standard Model. We point out that for the case of the maximal mixing between singlet scalars and the standard Higgs boson, the Higgs boson production cross-section is smaller than the standard Higgs boson production by a factor of 1/(N+1), where N is the number of singlet scalars. For the case of large mixing, Higgs boson could be unobservable at LHC. However, there is also the possibility for the observation of scalar singlets at LHC. As a semi-realistic example, we discuss supersymmetric SU(2) ⊗ U(1) electroweak model with an additional singlet chiral superfield.
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10

CYNOLTER, G., E. LENDVAI, and G. PÓCSIK. "S AND T PARAMETERS IN THE FERMION CONDENSATE MODEL." Modern Physics Letters A 24, no. 29 (September 21, 2009): 2331–44. http://dx.doi.org/10.1142/s0217732309031594.

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We calculate the oblique electroweak corrections and confront them with the experiments in a composite Higgs version of the standard model. A vector-like weak doublet and a singlet fermion are added to the standard model without elementary Higgs. Due to quartic coupling, there is a mixing between the components of the new fields triggering electroweak symmetry breaking. The Peskin–Takeuchi S and T electroweak parameters are presented. The new sector of vector-like fermions is slightly constrained, T gives an upper bound on the mixing angle of the new fermions, which is already constrained by self-consistent gap-equations. S gives no constraints on the masses. This extension can give a positive contribution to T, allowing for a heavy Higgs boson in electroweak precision tests of the Standard Model.
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11

Schröder, Y., and M. Steinhauser. "Four-loop singlet contribution to the electroweak ρ parameter." Physics Letters B 622, no. 1-2 (August 2005): 124–30. http://dx.doi.org/10.1016/j.physletb.2005.06.085.

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12

Cline, James M., and Kimmo Kainulainen. "Electroweak baryogenesis and dark matter from a singlet Higgs." Journal of Cosmology and Astroparticle Physics 2013, no. 01 (January 8, 2013): 012. http://dx.doi.org/10.1088/1475-7516/2013/01/012.

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13

Chiang, Cheng-Wei, and Eibun Senaha. "Electroweak interacting dark matter with a singlet scalar portal." Physics Letters B 750 (November 2015): 147–53. http://dx.doi.org/10.1016/j.physletb.2015.09.011.

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14

RAJPOOT, SUBHASH. "AN SU(2)L×U(1)L×U(1)R MODEL WITH FINITE DIRAC NEUTRINO MASSES." Modern Physics Letters A 08, no. 10 (March 28, 1993): 895–902. http://dx.doi.org/10.1142/s0217732393000921.

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An SU(2)L×U(1)L×U(1)R model of electroweak interactions is presented in which the conventional fermions of the standard model are left-handed doublets under SU(2)L× U(1)L and are right-handed singlets under U(1) R . The triangle anomalies are canceled by adding vector-like singlet fermions. Neutrinos are massless at the tree level due to a discrete symmetry and acquire tiny finite masses at the one-loop level due to the exchange of two charged scalar singlets. The singlet scalars carry two units of lepton number.
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15

BABU, K. S., and ERNEST MA. "SINGLET FERMION DARK MATTER AND ELECTROWEAK BARYOGENESIS WITH RADIATIVE NEUTRINO MASS." International Journal of Modern Physics A 23, no. 12 (May 10, 2008): 1813–19. http://dx.doi.org/10.1142/s0217751x08040299.

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The model of radiative neutrino mass with dark matter proposed by one of us is extended to include a real singlet scalar field. There are then two important new consequences. One is the realistic possibility of having the lightest neutral singlet fermion (instead of the lightest neutral component of the dark scalar doublet) as the dark matter of the universe. The other is a modification of the effective Higgs potential of the Standard Model, consistent with electroweak baryogenesis.
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16

McDonald, John. "Electroweak baryogenesis and dark matter via a gauge singlet scalar." Physics Letters B 323, no. 3-4 (March 1994): 339–46. http://dx.doi.org/10.1016/0370-2693(94)91229-7.

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17

RAJPOOT, S. "SEE-SAW MASSES FOR QUARKS AND LEPTONS IN AN AMBIDEXTROUS ELECTROWEAK INTERACTION MODEL." Modern Physics Letters A 02, no. 05 (May 1987): 307–15. http://dx.doi.org/10.1142/s0217732387000422.

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An ambidextrous electroweak interaction model with SU (2)L× SU (2)R× U (1) gauge symmetry is described in which the conventional quarks and leptons are accompanied by a set of new fermions that transform as singlets of SU (2)L× SU (2)R. The model has only two doublets of Higgs scalars. The masses of all known quarks and leptons result from the see-saw mechanism between the conventional fermions and the new “singlet” fermions. Neutrino neutral current interactions are identical to those of the standard SU (2)L× U (1) model. The singlet fermion masses lie in the 100-GeV to 1-TeV range to be probed by the oncoming accelerators of the 1990’s.
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18

CIEZA MONTALVO, J. E., and P. P. DE QUEIROZ FILHO. "PAIR OF HEAVY-EXOTIC-QUARKS AT LHC." International Journal of Modern Physics A 17, no. 28 (November 10, 2002): 4133–41. http://dx.doi.org/10.1142/s0217751x02010686.

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We study the production and signatures of heavy exotic quarks pairs at LHC in the framework of the vector singlet model (VSM), vector doublet model (VDM) and fermion-mirror-fermion (FMF) model. The pair production cross-sections for the electroweak and strong sector are computed.
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19

Kobakhidze, Archil, Adrian Manning, and Jason Yue. "Gravitational waves from the phase transition of a nonlinearly realized electroweak gauge symmetry." International Journal of Modern Physics D 26, no. 10 (August 20, 2017): 1750114. http://dx.doi.org/10.1142/s0218271817501140.

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Within the Standard Model with nonlinearly realized electroweak symmetry, the LHC Higgs boson may reside in a singlet representation of the gauge group. Several new interactions are then allowed, including anomalous Higgs self-couplings, which may drive the electroweak phase transition to be strongly first-order. In this paper, we investigate the cosmological electroweak phase transition in a simplified model with an anomalous Higgs cubic self-coupling. We look at the feasibility of detecting gravitational waves produced during such a transition in the early universe by future space-based experiments. We demonstrate an intriguing interplay between collider measurements of the Higgs self-coupling and these potential gravitational wave measurements. We find that for the range of relatively large cubic couplings, [Formula: see text], [Formula: see text]mHz frequency gravitational waves can be observed by eLISA, while BBO will potentially be able to detect waves in a wider frequency range, [Formula: see text][Formula: see text]mHz.
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20

Ghorbani, Parsa. "Vacuum structure and electroweak phase transition in singlet scalar dark matter." Physics of the Dark Universe 33 (September 2021): 100861. http://dx.doi.org/10.1016/j.dark.2021.100861.

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21

Cline, James M., Guillaume Laporte, Hiroki Yamashita, and Sabine Kraml. "Electroweak phase transition and LHC signatures in the singlet Majoron model." Journal of High Energy Physics 2009, no. 07 (July 13, 2009): 040. http://dx.doi.org/10.1088/1126-6708/2009/07/040.

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22

Huber, S. J., and M. G. Schmidt. "Electroweak baryogenesis: concrete in a SUSY model with a gauge singlet." Nuclear Physics B 606, no. 1-2 (July 2001): 183–230. http://dx.doi.org/10.1016/s0550-3213(01)00250-4.

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23

Espinosa, J. R., T. Konstandin, and F. Riva. "Strong electroweak phase transitions in the Standard Model with a singlet." Nuclear Physics B 854, no. 3 (January 2012): 592–630. http://dx.doi.org/10.1016/j.nuclphysb.2011.09.010.

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24

Sei, Norihiro, Isao Umemura, and Katsuji Yamamoto. "Constraints on the electroweak phase transition in the singlet majoron model." Physics Letters B 299, no. 3-4 (January 1993): 286–92. http://dx.doi.org/10.1016/0370-2693(93)90261-f.

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25

APPELQUIST, THOMAS. "NEUTRINO MASSES WITH DYNAMICAL ELECTROWEAK SYMMETRY BREAKING." International Journal of Modern Physics A 18, no. 22 (September 10, 2003): 3935–46. http://dx.doi.org/10.1142/s0217751x03017270.

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In this talk I discuss the problem of accounting for light neutrino masses in theories with dynamical electroweak symmetry breaking. I will first describe this problem generally in a class of extended technicolor (ETC) models, describing the full set of Dirac and Majorana masses that arise in such theories. I will then present an explicit model exhibiting a combination of suppressed Dirac masses and a seesaw involving dynamically generated condensates of standard-model singlet, ETC-nonsinglet fermions. Because of the suppression of the Dirac neutrino mass terms, a seesaw yielding realistic neutrino masses does not require superheavy Majorana masses; indeed, the Majorana masses are typically much smaller than the largest ETC scale.
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26

Beylin, Vitaly, and Vladimir Kuksa. "Dark Matter in the Standard Model Extension with Singlet Quark." Advances in High Energy Physics 2018 (December 16, 2018): 1–9. http://dx.doi.org/10.1155/2018/8670954.

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We analyze the possibility of hadron Dark Matter carriers consisting of singlet quark and the light standard one. It is shown that stable singlet quarks generate effects of new physics which do not contradict restrictions from precision electroweak data. The neutral and charged pseudoscalar low-lying states are interpreted as the Dark Matter particle and its mass-degenerated partner. We evaluate their masses and lifetime of the charged component and describe the potential asymptotes of low-energy interactions of these particles with nucleons and with each other. Some peculiarities of Sommerfeld enhancement effect in the annihilation process are also discussed.
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27

Pozzorini, S. "Next-to-leading mass singularities in two-loop electroweak singlet form factors." Nuclear Physics B 692, no. 1-2 (August 2004): 135–74. http://dx.doi.org/10.1016/j.nuclphysb.2004.05.025.

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28

Choi, J., and R. R. Volkas. "Real Higgs singlet and the electroweak phase transition in the standard model." Physics Letters B 317, no. 3 (November 1993): 385–91. http://dx.doi.org/10.1016/0370-2693(93)91013-d.

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29

Foot, Robert, and Archil Kobakhidze. "Electroweak scale invariant models with small cosmological constant." International Journal of Modern Physics A 30, no. 21 (July 22, 2015): 1550126. http://dx.doi.org/10.1142/s0217751x15501262.

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We consider scale invariant models where the classical scale invariance is broken perturbatively by radiative corrections at the electroweak scale. These models potentially offer an elegant and simple solution to the hierarchy problem. If we further require the cosmological constant to be small then such models are also highly predictive. Indeed, the minimal such model, comprizing a Higgs doublet and a real singlet, has the same number of parameters as the standard model. Although this minimal model is disfavored by recent LHC data, we show that two specific extensions incorporating neutrino masses and dark matter are fully realistic. That is, consistent with all experiments and observations. These models predict a light pseudo-Goldstone boson, h, with mass around 10 GeV or less. A fermionic-bosonic mass relation is also predicted. The specific models considered, as well as more generic scale invariant models, can be probed at the LHC.
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30

Chiang, Cheng-Wei, Yen-Ting Li, and Eibun Senaha. "Revisiting electroweak phase transition in the standard model with a real singlet scalar." Physics Letters B 789 (February 2019): 154–59. http://dx.doi.org/10.1016/j.physletb.2018.12.017.

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31

MOHAN, SUBIR. "MODEL FOR EFFICIENT MONOPOLE ANNIHILATION AND BARYOGENESIS." Modern Physics Letters A 10, no. 03 (January 30, 1995): 227–33. http://dx.doi.org/10.1142/s0217732395000260.

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We present a model for efficient annihilation of magnetic monopoles which is accomplished by breaking the electromagnetic gauge invariance for an appropriate range of temperature during the radiation dominated epoch of the early universe. Except for the brief period when electromagnetism is broken, the gauge-group symmetry is SU (3)c × SU (2)L × U (1)Y between the grand unification and electroweak transition temperature scales. The model consists of a standard Higgs doublet, a charged singlet and an uncharged singlet, and it is shown to work for a very general set of parameters with none of the scalar coupling constants being, necessarily, either too large or too small. The uncharged singlet can easily give adequately large Majorana mass to the right-handed neutrinos making baryogenesis possible through the decay of heavy right-handed neutrinos and sphaleron interactions.
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32

Palacio, Guillermo. "Neutrino masses in the SU(4)L ⊗ U(1)X electroweak extension of the Standard Model." International Journal of Modern Physics A 31, no. 25 (September 8, 2016): 1650142. http://dx.doi.org/10.1142/s0217751x16501426.

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We study the neutrino mass generation in the [Formula: see text] electroweak extension of the Standard Model by considering nonrenormalizable dimension 5 effective operators. It is shown that there exist two topologies for the realizations of such an operator at the tree-level and for one of the three-family models the neutrino phenomenology is explored after extending its particle content with an [Formula: see text] fermion singlet and a scalar decuplet. Constraints in the available parameters space of the model are partially discussed.
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33

Fayyazuddin. "Lepton flavor violating decays of μ and τ leptons in a gauge group SU(2)L × SU(2)R × SU(2)Y." International Journal of Modern Physics A 31, no. 16 (June 9, 2016): 1650094. http://dx.doi.org/10.1142/s0217751x16500949.

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The electroweak unification group [Formula: see text] is proposed for the charged lepton flavor violating decays of the muon [Formula: see text] and tau [Formula: see text] leptons. The group [Formula: see text] is in the lepton space. The left-handed leptons and antileptons are assigned to the fundamental representation [Formula: see text] of the semi-simple group. The gauge group [Formula: see text] is spontaneously broken to [Formula: see text], where [Formula: see text] is the hypercharge, by introducing a scalar multiplet [Formula: see text] which belongs to the triplet representation 3 of the [Formula: see text] and is singlet under [Formula: see text]. At this stage charged vector bosons [Formula: see text] of [Formula: see text] which mediate the lepton flavor violating decays acquire masses and are decoupled with one Higgs scalar [Formula: see text]. The residual group [Formula: see text] has all the features of the left–right electroweak unification group extensively studied in the literature. The probability for lepton flavor violating decays is [Formula: see text].
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34

Alanne, Tommi, Heidi Rzehak, Francesco Sannino, and Anders Eller Thomsen. "Raising the SUSY-breaking scale in a Goldstone–Higgs model." Modern Physics Letters A 32, no. 27 (August 24, 2017): 1750143. http://dx.doi.org/10.1142/s0217732317501437.

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We show that by combining the elementary Goldstone–Higgs scenario and supersymmetry it is possible to raise the scale of supersymmetry breaking to several TeVs by relating it to the spontaneous-symmetry-breaking one. This is achieved by first enhancing the global symmetries of the super-Higgs sector to SU(4) and then embedding the electroweak sector and the Standard Model (SM) fermions. We determine the conditions under which the model achieves a vacuum such that the resulting Higgs is a pseudo-Goldstone boson (pGB). The main results are: the supersymmetry-breaking scale is identified with the spontaneous-symmetry-breaking scale of SU(4) which is several TeVs above the radiatively induced electroweak scale; intriguingly the global symmetry of the Higgs sector predicts the existence of two super-Higgs multiplets with one mass eigenstate playing the role of the pseudo-Goldstone Higgs; the symmetry-breaking dynamics fixes [Formula: see text] and requires a supplementary singlet chiral superfield. We finally discuss the spectrum of the model that now features the superpartners of the SM fermions and gauge bosons in the multi-TeV range.
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35

Barger, V., and K. Whisnant. "HEAVY Z BOSON DECAYS TO W, Z AND HIGGS BOSONS IN E6 SUPERSTRING MODELS." International Journal of Modern Physics A 02, no. 04 (August 1987): 1171–79. http://dx.doi.org/10.1142/s0217751x87000557.

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We report on the decays of a heavy neutral gauge boson Z2 into W+W−, the Z and a Higgs boson, or two Higgs bosons in superstring-inspired electroweak models with an extra U(1) gauge group, two Higgs doublets and a Higgs singlet. The branching ratios for these processes are generally similar and two boson decay modes of Z2 must exist at the few percent level if kinematically accessible, although the bosonic modes which dominate in any given scenario depend on the U(1) quantum numbers and mixing in the Higgs sector.
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36

DÍAZ-CRUZ, J. L., O. FÉLIX-BELTRÁN, A. ROSADO, and S. ROSADO-NAVARRO. "ELECTROWEAK RIGHT-HANDED NEUTRINOS AND NEW HIGGS SIGNALS AT THE LHC." International Journal of Modern Physics A 26, no. 17 (July 10, 2011): 2865–80. http://dx.doi.org/10.1142/s0217751x11053675.

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We explore some aspects of the phenomenology of the Higgs sector in a model that includes right-handed neutrinos, with a mass of the order of the electroweak scale. In this model all scales arise from spontaneous symmetry breaking, thus the Higgs sector includes an extra Higgs singlet, in addition to the Standard Model Higgs doublet. The scalar spectrum includes two neutral CP-even states (h and H, with mh < mH) and a neutral CP-odd state (σ) that can be identified as a pseudo-Majoron. The parameter of the Higgs potential are constrained using a perturbativity criteria, which amounts to solve the corresponding RGE. The relevant Higgs branching ratios and some cross-sections are discussed, with special emphasis on the detection of the invisible Higgs signal at the LHC.
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37

Cho, Gi-Chol, Chikako Idegawa, and Eibun Senaha. "Electroweak phase transition in a complex singlet extension of the Standard Model with degenerate scalars." Physics Letters B 823 (December 2021): 136787. http://dx.doi.org/10.1016/j.physletb.2021.136787.

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38

Ham, S. W., Y. S. Jeong, and S. K. Oh. "Electroweak phase transition in an extension of the standard model with a real Higgs singlet." Journal of Physics G: Nuclear and Particle Physics 31, no. 8 (June 24, 2005): 857–71. http://dx.doi.org/10.1088/0954-3899/31/8/017.

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39

Ilnicka, Agnieszka, Tania Robens, and Tim Stefaniak. "Constraining extended scalar sectors at the LHC and beyond." Modern Physics Letters A 33, no. 10n11 (April 10, 2018): 1830007. http://dx.doi.org/10.1142/s0217732318300070.

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We give a brief overview of beyond the Standard Model (BSM) theories with an extended scalar sector and their phenomenological status in the light of recent experimental results. We discuss the relevant theoretical and experimental constraints, and show their impact on the allowed parameter space of two specific models: the real scalar singlet extension of the Standard Model (SM) and the Inert Doublet Model. We emphasize the importance of the LHC measurements, both the direct searches for additional scalar bosons, as well as the precise measurements of properties of the Higgs boson of mass 125 GeV. We show the complementarity of these measurements to electroweak and dark matter observables.
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40

Ermolaev, B. I., and S. I. Troyan. "Impact of double-logarithmic electroweak radiative corrections on the non-singlet structure functions at small x." Journal of High Energy Physics 2008, no. 04 (April 17, 2008): 068. http://dx.doi.org/10.1088/1126-6708/2008/04/068.

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41

Preuss, Christian T., and German Valencia. "Long-lived electroweak-singlet colored scalars." Physical Review D 104, no. 9 (November 30, 2021). http://dx.doi.org/10.1103/physrevd.104.095030.

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42

Howe, Kiel, Simon Knapen, and Dean J. Robinson. "Diphotons from electroweak triplet-singlet mixing." Physical Review D 94, no. 3 (August 23, 2016). http://dx.doi.org/10.1103/physrevd.94.035021.

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43

Bagnaschi, Emanuele, John Ellis, Maeve Madigan, Ken Mimasu, Veronica Sanz, and Tevong You. "SMEFT analysis of mW." Journal of High Energy Physics 2022, no. 8 (August 31, 2022). http://dx.doi.org/10.1007/jhep08(2022)308.

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Abstract We use the Fitmaker tool to incorporate the recent CDF measurement of mW in a global fit to electroweak, Higgs, and diboson data in the Standard Model Effective Field Theory (SMEFT) including dimension-6 operators at linear order. We find that including any one of the SMEFT operators $$ \mathcal{O} $$ O HWB, $$ \mathcal{O} $$ O HD, $$ \mathcal{O} $$ O ℓℓ or $$ {\mathcal{O}}_{H\ell}^{(3)} $$ O H ℓ 3 with a non-zero coefficient could provide a better fit than the Standard Model, with the strongest pull for $$ \mathcal{O} $$ O HD and no tension with other electroweak precision data. We then analyse which tree-level single-field extensions of the Standard Model could generate such operator coefficients with the appropriate sign, and discuss the masses and couplings of these fields that best fit the CDF measurement and other data. In particular, the global fit favours either a singlet Z′ vector boson, a scalar electroweak triplet with zero hypercharge, or a vector electroweak triplet with unit hypercharge, followed by a singlet heavy neutral lepton, all with masses in the multi-TeV range for unit coupling.
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44

Niemi, Lauri, Philipp Schicho, and Tuomas V. I. Tenkanen. "Singlet-assisted electroweak phase transition at two loops." Physical Review D 103, no. 11 (June 30, 2021). http://dx.doi.org/10.1103/physrevd.103.115035.

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45

Pilaftsis, Apostolos. "Electroweak resonant leptogenesis in the singlet Majoron model." Physical Review D 78, no. 1 (July 21, 2008). http://dx.doi.org/10.1103/physrevd.78.013008.

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46

Costa, Raul, Marco O. P. Sampaio, and Rui Santos. "NLO electroweak corrections in general scalar singlet models." Journal of High Energy Physics 2017, no. 7 (July 2017). http://dx.doi.org/10.1007/jhep07(2017)081.

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47

Bell, Nicole F., Matthew J. Dolan, Leon S. Friedrich, Michael J. Ramsey-Musolf, and Raymond R. Volkas. "A real triplet-singlet extended Standard Model: dark matter and collider phenomenology." Journal of High Energy Physics 2021, no. 4 (April 2021). http://dx.doi.org/10.1007/jhep04(2021)098.

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Abstract We examine the collider and dark matter phenomenology of the Standard Model extended by a hypercharge-zero SU(2) triplet scalar and gauge singlet scalar. In particular, we study the scenario where the singlet and triplet are both charged under a single ℤ2 symmetry. We find that such an extension is capable of generating the observed dark matter density, while also modifying the collider phenomenology such that the lower bound on the mass of the triplet is smaller than in minimal triplet scalar extensions to the Standard Model. A high triplet mass is in tension with the parameter space that leads to novel electroweak phase transitions in the early universe. Therefore, the lower triplet masses that are permitted in this extended model are of particular importance for the prospects of successful electroweak baryogenesis and the generation of gravitational waves from early universe phase transitions.
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48

Fairbairn, Malcolm, and Robert Hogan. "Singlet fermionic dark matter and the electroweak phase transition." Journal of High Energy Physics 2013, no. 9 (September 2013). http://dx.doi.org/10.1007/jhep09(2013)022.

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49

Shrock, Robert. "Variants of the standard model with electroweak-singlet quarks." Physical Review D 78, no. 7 (October 30, 2008). http://dx.doi.org/10.1103/physrevd.78.076009.

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50

Cankoçak, Kerem, Durmuş Demir, Canan Karahan, and Sercan Şen. "Electroweak stability and discovery luminosities for new physics." European Physical Journal C 80, no. 12 (December 2020). http://dx.doi.org/10.1140/epjc/s10052-020-08755-5.

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AbstractWhat is the luminosity needed for discovering new physics if the electroweak scale is to remain stable? In this work we study this question, with the pertinent example of a real singlet scalar which couples to the Higgs field at the renormalizable level. Observing that the electroweak scale remains stable if the two scalars couple in a see-sawic fashion through a mass-degeneracy-driven unification linkup among quartic couplings at a given scale, we show by detailed simulation studies of the $$pp\rightarrow (\mathrm{singlet\ scalar}) \rightarrow Z Z \rightarrow 4\ell $$ p p → ( singlet scalar ) → Z Z → 4 ℓ channel that the HL-LHC, which is expected to deliver an integrated luminosity of $$3~\mathrm{ab^{-1}}$$ 3 ab - 1 , has no significant excess of signal over the background in the 800–2000 GeV mass range. The FCC-hh, on the other hand, can discover scalars up to a mass of 870 GeV with an integrated luminosity $$20~\mathrm{ab^{-1}}$$ 20 ab - 1 . Observation at $$3\sigma $$ 3 σ (discovery at $$5\sigma $$ 5 σ ) of a new scalar with a minimum mass 800 GeV requires at least $$2~\mathrm{ab^{-1}}$$ 2 ab - 1 ($$5.2~\mathrm{ab^{-1}}$$ 5.2 ab - 1 ) integrated luminosity, showing that the new physics that does not destabilize the electroweak scale is accessible only at very high luminosities, and can be tested already in the early stages of the FCC-hh operation period.
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