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- 저자 : Klemm, (검색결과 6 건)
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Richard A.Klemm 한국물리학회 2004 Current Applied Physics Vol.4 No.5
Extensive atomic resolution transmission electron microscopy and holography studies showed thec-axis bicrystal twist junctionsof Bi2Sr2CaCu2O8þ d (Bi2212) studied by Li et al. [Phys. Rev. Lett. 83 (1999) 4160] to be atomically clean, with electronic and elasticproperties independent of the twist angle. These critical current experiments thus provideprima facieevidence for a dominant s-waveorder parameter and strongly incoherentc-axis quasiparticle tunnelling in Bi2212. New Bi2212 cross-whisker junction data con-rming the Li et al. experiment are presented.
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Electroweak production of light scalar-pseudoscalar pairs from extended Higgs sectors
Enberg, R.,Klemm, W.,Moretti, S.,Munir, S. North-Holland Pub. Co 2017 Physics letters. Section B Vol.764 No.-
In models with extended Higgs sectors, it is possible that the Higgs boson discovered at the LHC is not the lightest one. We show that in a realistic model (the Type I 2-Higgs Doublet Model), when the sum of the masses of a light scalar and a pseudoscalar (h and A) is smaller than the Z boson mass, the Electroweak (EW) production of an hA pair can dominate over QCD production by orders of magnitude, a fact not previously highlighted. This is because in the gg-initiated process, hA production via a resonant Z in the s-channel is prohibited according to the Landau-Yang theorem, which is not the case for the qq@?-initiated process. We explore the parameter space of the model to highlight regions giving such hA solutions while being consistent with all constraints from collider searches, b-physics and EW precision data. We also single out a few benchmark points to discuss their salient features, including the hA search channels that can be exploited at Run II of the LHC.
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Charged Higgs boson in the <sup> W ± </sup> Higgs channel at the Large Hadron Collider
Enberg, Rikard,Klemm, William,Moretti, Stefano,Munir, Shoaib,Wouda, Glenn Elsevier 2015 Nuclear Physics, Section B Vol.893 No.-
<P><B>Abstract</B></P> <P>In light of the recent discovery of a neutral Higgs boson, <SUB> H obs </SUB> , with a mass near 125 GeV , we reassess the LHC discovery potential of a charged Higgs boson, <SUP> H ± </SUP> , in the <SUP> W ± </SUP> <SUB> H obs </SUB> decay channel. This decay channel can be particularly important for a <SUP> H ± </SUP> heavier than the top quark, when it is produced through the p p → t <SUP> H ± </SUP> process. The knowledge of the mass of <SUB> H obs </SUB> provides an additional handle in the kinematic selection when reconstructing a Breit–Wigner resonance in the <SUB> H obs </SUB> → b b ¯ decay channel. We consider some extensions of the Standard Model Higgs sector, with and without supersymmetry, and perform a dedicated signal-to-background analysis to test the scope of this channel for the LHC running at the design energy (14 TeV), for 300 <SUP> fb − 1 </SUP> (standard) and 3000 <SUP> fb − 1 </SUP> (high) integrated luminosities. We find that, while this channel does not show much promise for a supersymmetric <SUP> H ± </SUP> state, significant portions of the parameter spaces of several two-Higgs doublet models are testable.</P>
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Role of Gap Junctions in the Endothelium-Dependent Hyperpolarization of Vascular Smooth Muscle Cells
Yoshimichi Yamamoto,Megan F. Klemm,Hikaru Hashitani,Richard J. Lang,Tsuyoshi Soji.,Hikaru Suzuki 대한생리학회-대한약리학회 2001 The Korean Journal of Physiology & Pharmacology Vol.5 No.1
<P> Hyperpolarization of arterial smooth muscle by acetylcholine is considered to be produced by the release of an unidentified chemical substance, an endothelium-derived hyperpolarizing factor (EDHF). Several chemicals have been proposed as the candidate for EDHF. However, none of them fulfil completely the nature and property of EDHF. Ultrastructural observation with electron microscope reveals that in some arteries, gap junctions are formed between endothelial and smooth muscle cells. In small arterioles, injection of gap junction permeable dyes into an endothelial cell results in a distribution of the dye to surrounding cells including smooth muscle cells. These observations allow the speculation that myoendothelial gap junctions may have a functional significance. Simultaneous measurement of the electrical responses in both endothelial and smooth muscle cells using the double patch clamp method demonstrates that these two cell types are indeed electrically coupled, indicating that they behave as a functional syncytium. The EDHF-induced hyperpolarization is produced by an activation of Ca<SUP>2</SUP>-sensitive K<SUP></SUP>-channels that are inhibited by charybdotoxin and apamin. Agonists that release EDHF increase [Ca<SUP>2</SUP>]<SUB>i</SUB> in endothelial cells but not in smooth muscle cells. Inhibition of gap junctions with chemical agents abolishes the agonist- induced hyperpolarization in smooth muscle cells but not in endothelial cells. All these observations can be explained if EDHF is an electrotonic signal propagating from endothelium to smooth muscle cells through gap junctions.
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Identifying a light charged Higgs boson at the LHC Run II
Arhrib, Abdesslam,Benbrik, Rachid,Enberg, Rikard,Klemm, William,Moretti, Stefano,Munir, Shoaib North-Holland Pub. Co 2017 Physics letters. Section B Vol.774 No.-
<P><B>Abstract</B></P> <P>We analyse the phenomenological implications of a light Higgs boson, <I>h</I>, within the CP-conserving 2-Higgs Doublet Model (2HDM) Type-I, for the detection prospects of the charged <SUP> H ± </SUP> state at Run II of the Large Hadron Collider (LHC), assuming s = 13 TeV as energy and O ( 100 <SUP> fb − 1 </SUP> ) as luminosity. When sufficiently light, this <I>h</I> state can open up the bosonic decay channel <SUP> H ± </SUP> → <SUP> W ± ( ⁎ ) </SUP> h , which may have a branching ratio significantly exceeding those of the <SUP> H ± </SUP> → τ ν and <SUP> H ± </SUP> → c s channels. We perform a broad scan of the 2HDM Type-I parameter space, assuming the heavier of the two CP-even Higgs bosons, <I>H</I>, to be the observed SM-like state with a mass near 125 GeV. Through these scans we highlight regions in which <SUB> m <SUP> H ± </SUP> </SUB> < <SUB> m t </SUB> + <SUB> m b </SUB> that are still consistent with the most recent limits from experimental searches. We find in these regions that, when the <SUP> H ± </SUP> → <SUP> W ± ( ⁎ ) </SUP> h decay mode is the dominant one, the <I>h</I> can be highly fermiophobic, with a considerably large decay rate in the <I>γγ</I> channel. This can result in the total cross section of the σ ( p p → <SUP> H ± </SUP> h → <SUP> W ± ( ⁎ ) </SUP> + 4 γ ) process reaching up to O ( 100 fb ) . We therefore investigate the possibility of observing this spectacular signal at the LHC Run II.</P>
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