421 research outputs found
Hydantoins and thiohydantoins derived from 1,2,3,4-tetrahydroisoquinoline-3-carboxylic acid
No full textThe reaction of methyl (S)-1,2,3,4-tetrahydroisoquinoline-3-carboxylate with isocyanates (phenyl, naphthalen-1-yl, cyclohexyl, (S)-1-methylbenzyl) in ether has been used to prepare N-substituted methyl (3S)-2-aminocarbonyl-1,2,3,4-tetrahydroisoquinoline-3-carboxylates. These compounds were cyclised by action of CF3COOH to give the corresponding 2-substituted (10aS)-10,10a-dihydroimidazo[1,5-b]isoquinoline-1,3(2H,5H)-diones (hydantoins Tic-H). Hydantoins Tic-H were also prepared by the reaction of methyl (S)-1,2,3,4-tetrahydroisoquinoline-3-carboxylate with isocyanates (methyl, (1S)-1-methylbenzyl, 4-methylphenyl, 3-methylphenyl, 4-chlorophenyl, 2,4-dichlorophenyl, 4-methoxyphenyl, 5-chloro-2-methoxyphenyl, 3-chloro-4-ethoxyphenyl) and triethylamine in CH2Cl2. 2-Substituted (10aS)-3-thioxo-1,2,3,5,10,10a-hexahydroimidazo[1,5-b]isoquinolin-1-ones (thiohydantoins Tic-TH) were prepared analogously by the reaction of methyl (S)-1,2,3,4-tetrahydroisoquinoline-3-carboxylate with isothiocyanates (methyl, ethyl, allyl, phenyl). The optical purity of selected substances was determined chromatographically
Derivatives of 1,2,3,4-Tetrahydroisoquinoline-3-carboxylic Acid
No full textThe following derivatives of 1,2,3,4-tetrahydroisoquinoline-3-carboxylic acid have been prepared in their (S)-form and as racemates: hydrochloride of methyl ester, N-carboxy anhydride, and N-acetyl derivative. All the substances were fully characterised by elemental analyses, H-1 and C-13 NMR spectra, and optical rotation, as the case may be; the M-carboxy anhydride was also characterised by means of X-Ray diffraction. Also identified was the intermediate of the reaction of the title acid with phosgene, the N-chlorocarbonyl derivative, and the respective methyl ester was prepared. The dioxopiperazine of the title acid was prepared and characterised both in pure (S,S)-form and in the form of a mixture of two racemates. The optically pure dioxopiperazine was prepared by a reaction of the N-carboxy anhydride in solid phase
Summary plot for the interpretation of heavy Higgs boson searches in the Georgi-Machacek model
No full textThis note presents a set of plots that summarize the interpretation of various searches for additional Higgs bosons beyond the Standard Model in the H5 plane benchmark of the Georgi-Machacek model. These summary plots use the full Run 2 dataset as recorded with the ATLAS detector at the Large Hadron Collider using proton-proton collisions at = 13 TeV and an integrated luminosity of 139 fb
The supersymmetric Georgi-Machacek model
No full textWe show that the well known Georgi-Machacek (GM) model can be realized as
a limit of the recently constructed Supersymmetric Custodial Higgs Triplet Model (SCTM)
which in general contains a signifcantly more complex scalar spectrum. We dub this limit
of the SCTM, which gives a weakly coupled origin for the GM model at the electroweak
scale, the Supersymmetric GM (SGM) model. We derive a mapping between the SGM
and GM models using it to show how a supersymmetric origin implies constraints on the
Higgs potential in conventional GM model constructions which would generically not be
present. We then perform a simplifed phenomenological study of diphoton and ZZ signals
for a pair of benchmark scenarios to illustrate under what circumstances the GM model
can mimic the SGM model and when they should be easily distinguishable.The work
of R.V.M. is supported by MINECO, FPA 2016-78220-C3-1-P, FPA 2013-47836-C3-2/3-P
(including ERDF), and the Juan de la Cierva program, as well as by Junta de Andalucia Project FQM-101. The work of R.V. is partially supported by the Sam Taylor fellowship. K.X. is supported by U. S. Department of Energy under Grant No. DE-SC0010129
More Constraints on the Georgi-Machacek Model
No full textIn this work, we investigate the parameter space of the Georgi-Machacek (GM)
model, where we consider many theoretical and experimental constraints such as
the perturbativity, vacuum stability, unitarity, electroweak precision tests,
the Higgs di-photon decay, the Higgs total decay width and the LHC measurements
of the signal strengths of the SM-like Higgs boson in addition to the
constraints from doubly charged Higgs bosons and Drell-Yan di-photon production
and the indirect constraint from the transition processes. We
investigate also the possibility that the electroweak vacuum could be
destabilized by unwanted wrong minima that may violate the CP and/or the
electric charge symmetries. We found that about 40 \% of the parameter space
that fulfills the above mentioned constraints; are excluded by these unwanted
minima. In addition, we found that the negative searches for a heavy resonance
could exclude a significant part of the viable parameter space; and future
searches could exclude more regions in the parameter space.Comment: More constraints are considered, 21 pages & 9 figure
Search for charged Higgs bosons produced in vector boson fusion processes and decaying into vector boson pairs in proton–proton collisions at √s=13TeV
No full text© 2021, The Author(s).A search for charged Higgs bosons produced in vector boson fusion processes and decaying into vector bosons, using proton–proton collisions at s=13TeV at the LHC, is reported. The data sample corresponds to an integrated luminosity of 137fb-1 collected with the CMS detector. Events are selected by requiring two or three electrons or muons, moderate missing transverse momentum, and two jets with a large rapidity separation and a large dijet mass. No excess of events with respect to the standard model background predictions is observed. Model independent upper limits at 95% confidence level are reported on the product of the cross section and branching fraction for vector boson fusion production of charged Higgs bosons as a function of mass, from 200 to 3000GeV. The results are interpreted in the context of the Georgi–Machacek model
Higgs boson pair productions in the Georgi-Machacek model at the LHC
No full textAbstract Higgs bosons pair production is well known for its sensitivity to probing the sign and size of Higgs boson self coupling, providing a way to determine whether there is an extended Higgs sector. The Georgi-Machacek (GM) model extends the Standard Model (SM) with an SU(2) L triplet scalar field that has one real and one complex components. The Higgs self coupling now has a wider range than that in the SM, with even the possibility of a sign flip. The new heavy singlet Higgs boson H 1 0 can contribute to s-channel production of the hh pairs. In this work, we study non-resonant/resonant Higgs boson pair productions pp → hh and pp → H 1 0 → hh, focusing exclusively on the contribution of H 1 0 . We show the sensitivity for Higgs boson pair production searches at the 13-TeV LHC with the luminosities of 3.2, 30 and 100 fb−1
The 95 GeV Excess in the Georgi-Machacek Model: Single or Twin Peak Resonance
No full textIn this work, we investigate the possibility to address the excess observed around 95 GeV in the , , and channels as a scalar resonance(s) within the Georgi-Machacek (GM) model. In our analysis, we find that the excess can be easily accommodated in the channels ( and ) simultaneously, where the 95 GeV candidate is a single peak resonance (SPR) due to a light CP-even scalar. We found that the excess in the channel can be addressed simultaneously with and only if the 95 GeV candidate is a twin peak resonance (TPR), i.e., another CP-odd scalar in addition to the CP-even scalar. We demonstrate that the nature of the 95 GeV scalar resonance candidate (SPR or TPR) can be probed via the properties of its di- decay.12 pages & 4 figures. Published versio
Search for charged Higgs bosons produced in vector boson fusion processes and decaying into vector boson pairs in proton-proton collisions at 13 TeV
No full textA search for charged Higgs bosons produced in vector boson fusion processes and decaying into vector bosons, using proton-proton collisions at 13 TeV at the LHC, is reported. The data sample corresponds to an integrated luminosity of 137 fb collected with the CMS detector. Events are selected by requiring two or three electrons or muons, moderate missing transverse momentum, and two jets with a large rapidity separation and a large dijet mass. No excess of events with respect to the standard model background predictions is observed. Model independent upper limits at 95\% confidence level are reported on the product of the cross section and branching fraction for vector boson fusion production of charged Higgs bosons as a function of mass, from 200 to 3000 GeV. The results are interpreted in the context of the Georgi-Machacek model.A search for charged Higgs bosons produced in vector boson fusion processes and decaying into vector bosons, using proton–proton collisions at at the LHC, is reported. The data sample corresponds to an integrated luminosity of 137 collected with the CMS detector. Events are selected by requiring two or three electrons or muons, moderate missing transverse momentum, and two jets with a large rapidity separation and a large dijet mass. No excess of events with respect to the standard model background predictions is observed. Model independent upper limits at 95% confidence level are reported on the product of the cross section and branching fraction for vector boson fusion production of charged Higgs bosons as a function of mass, from 200 to 3000. The results are interpreted in the context of the Georgi–Machacek model.A search for charged Higgs bosons produced in vector boson fusion processes and decaying into vector bosons, using proton-proton collisions at 13 TeV at the LHC, is reported. The data sample corresponds to an integrated luminosity of 137 fb collected with the CMS detector. Events are selected by requiring two or three electrons or muons, moderate missing transverse momentum, and two jets with a large rapidity separation and a large dijet mass. No excess of events with respect to the standard model background predictions is observed. Model independent upper limits at 95% confidence level are reported on the product of the cross section and branching fraction for vector boson fusion production of charged Higgs bosons as a function of mass, from 200 to 3000 GeV. The results are interpreted in the context of the Georgi-Machacek model
Some new observations for the Georgi-Machacek scenario with triplet Higgs
No full textThe Georgi-Machacek model, introducing a complex and a real scalar triplet as
additional components of the electroweak symmetry breaking sector, enables
substantial triplet contributions to the weak gauge boson masses, subject to
the equality of the complex and the real triplet vacuum expectation values
(vev) via a custodial SU(2) symmetry. We present an updated set of constraints
on this scenario, from collider data (including those from 137/139~fb of
luminosity at the Large Hadron Collider), available data on the 125-GeV scalar,
indirect limits and also theoretical restrictions from vacuum stability and
unitarity. It is found that some bounds get relaxed, and the phenomenological
potential of the scenario is more diverse, if the doubly charged scalar in the
spectrum can decay not only into two like-sign 's but also into one or two
singly charged scalars. Other interesting features are noticed in a general
approach, such as substantial and branching ratios of
the additional custodial singlet scalar, and appreciable strength of the
trilinear interaction of a charged scalar, the and the . Finally,, we
take into account the possibility of custodial SU(2) breaking, resulting in
inequality of the real and the complex scalar vevs which too in principle may
allow large triplet contribution to weak boson masses. Illustrative numerical
results on the modified limits and predictions are presented, once more taking
into account all the constraints mentioned above.Comment: 17 pages, 9 figure
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