Heavy neutrino mixing effects in helicity amplitudes for the process<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>μ</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mrow><mml:msup><mml:mrow><mml:mi>μ</mml:mi></mml:mrow><mml:mrow><mml:mi>−</mml:mi></mml:mrow></mml:msup></mml:mrow><mml:mo>→</mml:mo><mml:mrow><mml:msup><mml:mrow><mml:mi>W</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></

Singhal, Jai Kumar; Singh, Sardar; Nagawat, Ashok K.; Sharma, Neetika

doi:10.1103/physrevd.63.017302

Cited by 3 publications

(1 citation statement)

References 8 publications

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“…By definition, it is related to the existence of two or more crystalline forms of a compound without any alteration to its chemical structure and empirical formula (Gavezzotti, 2007). Polymorphic forms exhibit differences with respect to bioavailability, solubility and the stability of the crystalline forms (Yu et al, 2003), and influence the pharmacokinetics and pharmacodynamics of a drug administered into the body (Singhal & Curatolo, 2004). For example, Rifaximin is a broad spectrum antibacterial drug.…”

Section: Introductionmentioning

confidence: 99%

Two novel polymorphic forms of iron-chelating agent deferiprone

et al. 2020

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Thalassemia is a genetic blood disorder requiring life-long blood transfusions. This process often results in iron overload and can be treated by an ironchelating agent, like deferiprone (3-hydroxy-1,2-dimethylpyridin-4-one), C 7 H 9 NO 2 , in an oral formulation. The first crystal structure of deferiprone, (Ia), was reported in 1988 [Nelson et al. (1988). Can. J. Chem. 66, 123-131]. In the present study, two novel polymorphic forms, (Ib) and (Ic), of deferiprone were identified concomitantly with polymorph (Ia) during the crystallization experiments. Polymorph (Ia) was redetermined at low temperature for comparison of the structural features and lattice energy values with polymorphs (Ib) and (Ic). Polymorph (Ia) crystallized in the orthorhombic space group Pbca, whereas both polymorphs (Ib) and (Ic) crystallized in the monoclinic space group P2 1 /c. The asymmetric units of (Ia) and (Ib) contain one deferiprone molecule, while polymorph (Ic) has three crystallographically independent molecules (A, B and C). All three polymorphs have similar hydrogen-bonding features, such as an R 2 2 (10) dimer formed by O-HÁ Á ÁO hydrogen bonds, an R 4 3 (20) tetramer formed by C-HÁ Á ÁO hydrogen bonds andinteractions, but the polymorphs differ in their molecular arrangements in the solid state and are classified as packing polymorphs. O-HÁ Á ÁO and C-HÁ Á ÁO hydrogen bonds lead to the formation of two-dimensional hydrogen-bonded parallel sheets which are interlinked bystacking interactions. In the three-dimensional crystal packing, the deferiprone molecules were aggregated as corrugated sheets in polymorphs (Ia) and (Ic), whereas in polymorph (Ib), they were aggregated as a square-grid network. The characteristic crystalline peaks of polymorphs (Ia), (Ib) and (Ic) were established through powder X-ray diffraction analysis. The Rietveld analysis was also performed to estimate the contribution of the polymorphs to the bulk material.

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Section: Introductionmentioning

confidence: 99%

Two novel polymorphic forms of iron-chelating agent deferiprone

et al. 2020

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Distinguishing a SM-like MSSM Higgs boson from SM Higgs boson at muon collider

Singhal¹,

Singh

Nagawat

2007

Pramana - J Phys

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We explore the possibility of distinguishing the SM-like MSSM Higgs boson from the SM Higgs boson via Higgs boson pair production at future muon collider. We study the behavior of the production cross-section in SM and MSSM with Higgs boson mass for various MSSM parameters tan β and m A. We observe that at fixed CM energy, in the SM, the total cross-section increases with the increase in Higgs boson mass whereas this trend is reversed for the MSSM. The changes that occur for the MSSM in comparison to the SM predictions are quantified in terms of the relative percentage deviation in crosssection. The observed deviations in cross-section for different choices of Higgs boson masses suggest that the measurements of the cross-section could possibly distinguish the SM-like MSSM Higgs boson from the SM Higgs boson. Keywords.Higgs boson; standard model; minimal supersymmetric standard model; SMlike MSSM Higgs boson.

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Higgs boson mass effects in the processμR(L)+μR(L)
Singhal
¹
,
Singh
²

2001
Phys. Rev. D
2
0
2
0
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The process R(L) ϩ R(L) Ϫ →W L ϩ W L Ϫ is studied with a view to discern the Higgs boson mass effects. The helicity amplitudes are evaluated retaining muon mass terms and cancellation of possible bad high energy behavior is discussed. The results are examined in the context of the equivalence theorem. The Higgs boson mass effects in the differential cross section (d/d cos ), total cross section ͑͒, and forward-backward asymmetry (A FB ) are presented for two cases: ͑i͒ m H Ͻ2m W and ͑ii͒ m H Ͼ2m W . Near the W L pair production threshold, both d/d cos and increase with an increase in ͱs for case ͑ii͒, while this trend is absent for case ͑i͒. Near resonance (ͱsϷm H ), d/d cos does not show an appreciable dependence on . For case ͑i͒ A FB is always positive, while for case ͑ii͒ A FB changes sign from negative to positive at ͱsϭm H . The A FB decreases with an increase in m H for any ͱsϾm H .

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Heavy neutrino mixing effects in helicity amplitudes for the processμ+μ−→W+

Cited by 3 publications

References 8 publications

Two novel polymorphic forms of iron-chelating agent deferiprone

Two novel polymorphic forms of iron-chelating agent deferiprone

Distinguishing a SM-like MSSM Higgs boson from SM Higgs boson at muon collider

Higgs boson mass effects in the processμR(L)+μR(L)
Singhal
¹
,
Singh
²

2001
Phys. Rev. D
2
0
2
0
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Heavy neutrino mixing effects in helicity amplitudes for the processμ+μ−→W+

Cited by 3 publications

References 8 publications

Two novel polymorphic forms of iron-chelating agent deferiprone

Two novel polymorphic forms of iron-chelating agent deferiprone

Distinguishing a SM-like MSSM Higgs boson from SM Higgs boson at muon collider

Higgs boson mass effects in the processμR(L)+μR(L)Singhal1, Singh2 2001Phys. Rev. D2020View full textAdd to dashboardCite

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Higgs boson mass effects in the processμR(L)+μR(L)
Singhal
¹
,
Singh
²

2001
Phys. Rev. D
2
0
2
0
View full text Add to dashboard Cite