108,147 research outputs found
CP violation in h → ττ and LFV h → μτ
No full textDue to copyright restrictions, the access to the full text of this article is only available via subscription.The CMS Collaboration has reported a possible lepton flavor violating (LFV) signal h→μτ. Whereas this does not happen in the standard model (SM), we point out that new physics responsible for this type of decay would, in general, also produce charge-parity (CP) violation in h→ττ. We estimate the size of this effect in a model independent manner and find that a large asymmetry, of order 25%, is allowed by current constraints.DOE ; MOE ; ROC ; NSFC ; Shanghai Science and Technology Commission ; Korea Institute for Advanced Stud
NOVEL SYNTHESIS OF PYRROLIDINONES BY COBALT CARBONYL CATALYZED CARBONYLATION OF AZETIDINES - A NEW RING-EXPANSION CARBONYLATION REACTION OF 2-VINYLAZETIDINES TO TETRAHYDROAZEPINONES
No full textPyrrolidinones can be synthesized in high yields and regioselectivity by the cobalt carbonyl catalyzed carbonylation of azetidines. For 2-substituted azetidines (alkyl, aryl, CH2OH, CH2OR, CH2OCOR, and COOR), carbonyl insertion occurs in the more or less substituted ring carbon-nitrogen bond depending on the kind of substituent group and on the reaction temperature. In the case of 2-vinylazetidines, ring expansion and carbonylation affords seven-membered-ring tetrahydroazepinones. Good functional group tolerance was observed in these reactions
OCTACARBONYLDICOBALT INDUCED CONVERSION OF 1,2-DIAROYLDIAZIRIDINES INTO DIHYDRO-OXAZOLES (OXAZOLINES)
No full text1,2-Diaroyldiaziridines react with octacarbonyldicobalt in benzene, at 65-70°C, to give dihydro-oxazoles by an intramolecular displacement- rearrangement reaction; thermal rearrangement of the strained-ring heterocycles affords 4,5-dihydro-oxadiazoles
Biphasic and phase-transfer-catalyzed N-monoacylation and N,N'-diacylation of azobenzenes by cobalt carbonyl
No full textAzobenzenes react with a stoichiometric amount of cobalt carbonyl and excess methyl iodide under phase-transfer conditions (benzene, water, and benzyltriethylammonium chloride as the phase-transfer agent) to give acetic acid 1,2-diaryl-2-acetylhydrazides in reasonable yields. Byproducts arising from nitrogen-nitrogen bond cleavage were formed in several of the reactions. Reductive monoacylation of azobenzenes occurs on reaction with Co2(CO)8, methyl iodide, and a catalytic amount of p-toluenesulfonic acid under biphasic conditions
Novel Catalytic and Stoichiometric Approaches to Azetidine-2,4-diones from -Lactams Using Rhodium and Cobalt Complexes, Respectively.
No full textAlthough α-lactams are regiospecifically converted to azetidine-2,4-diones in fine yields with use of rhodium(I) [e.g., [Rh(CO)2Cl]2] and cobalt(0) [e.g., Co2(CO)8] complexes, the two processes are significantly different: the rhodium reaction occurs under carbon monoxide and is catalytic; the cobalt reaction is inhibited by carbon monoxide and is not catalytic
Highly Regioselective Palladium -Catalyzed Thiocarbonylation of Allenes With Thiols and Carbon Monoxide
No full textA series of mono- and di-substituted allenes underwent direct thiocarbonylation with thiols and carbon monoxide to form the corresponding β,γ-unsatd. thioesters in 73-94% yields. This reaction requires catalytic quantities of Pd(OAc)2 (3 mol %) and triphenylphosphine (12 mol %) in THF under an atm. of CO (400 psi) at 100 °C for 48 h. Other palladium catalyst systems such as Pd2(dba)3·CHCl3-PPh3, Pd(PPh3)4, and Pd(OAc)2-dppp are also effective for this reaction. The thiocarbonylation reaction is believed to proceed via an allylpalladium intermediate. The reaction exhibits high regioselectivity, in which the thiophenyl group adds to the less substituted double bond of allenes to give β,γ-unsatd. thioesters
Yukawa sector for lepton flavor violating in h -> mu tau and CP violation in h -> tau tau
No full textThe Higgs boson discovered at the LHC opened a new chapter for particle physics. Its properties need to be studied in detail to distinguish a purely standard model (SM) Higgs boson from one of many scalars in an enlarged Higgs sector. The CMS Collaboration has reported a possible signal for lepton flavor violation in h→μτ, which if confirmed, implies that the Higgs sector is larger than in the SM. New physics responsible for this type of decay may, in general, also introduce other observable effects such as charge-parity (CP) violation in h→ττ. We study two types of models that single out the third generation and can induce large h→μτ rates with different consequences for CP violation in h→ττ. Predictions for the size of the CP violating couplings require knowledge of the lepton Yukawa matrices and we discuss this in the context of two different textures considering all existing constraints.Department of Energy ; National Center for Theoretical
Sciences and Ministry of Science and Technology of
Republic of China ; National Science Foundation of
China ; Shanghai Science and Technology Commission of People's Republic of China ; Korea Institute for Advanced Study
sj-pdf-1-cps-10.1177_00104140211066216 – Supplemental Material for How Voters Respond to Presidential Assaults on Checks and Balances: Evidence from a Survey Experiment in Turkey
No full textSupplemental Material, sj-pdf-1-cps-10.1177_00104140211066216 for How Voters Respond to Presidential Assaults on Checks and Balances: Evidence from a Survey Experiment in Turkey by Aytuğ Şaşmaz, Alper H. Yagci and Daniel Ziblatt in Comparative Political Studies</p
The most extensive Holocene advance in the Stauning Alper, East Greenland, occurred in the Little Ice Age
No full textWe present glacial geologic and chronologic data concerning the Holocene ice extent in the Stauning Alper of East Greenland. The retreat of ice from the late-glacial position back into the mountains was accomplished by at least 11 000 cal years B.P. The only recorded advance after this time occurred during the past few centuries (the Little Ice Age). Therefore, we postulate that the Little Ice Age event represents the maximum Holocene ice extent in this part of East Greenland
Replication Data for: How Voters Respond to Presidential Assaults on Checks and Balances: Evidence from a Survey Experiment in Turkey
No full textWhy do voters support executive aggrandizement? One possible answer is that they do so because they think this will ease their preferred leader’s hand in putting their partisan vision into action, provided that the leader will continue winning elections. We study this phenomenon through a survey experiment in Turkey, by manipulating voters’ perceptions about the potential results of the first presidential election after a constitutional referendum of executive aggrandizement. We find that voters from both sides display what we call “elastic support” for executive aggrandizement; i.e. they change previously revealed constitutional preferences in response to varying winning chances. This elasticity increases not only when citizens feel greater social distance to perceived political “others” (i.e. affective polarization), but also when voters are concerned about economic management in a potential post-incumbent era. Our findings contribute to the literature on how polarization and economic anxiety contribute to executive aggrandizement and democratic backsliding
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