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• 1
Article
Language: English
In: The European Physical Journal A, 2017, Vol.53(5), pp.1-15
Description: Using QCD sum rules and the chiral SU (3) model, we investigate the effect of temperature, density, strangeness fraction and isospin asymmetric parameter on the shift in masses and decay constants of the pseudoscalar D and B meson in the hadronic medium, which consist of nucleons and hyperons. The in-medium properties of D and B mesons within the QCD sum rule approach depend upon the quark and gluon condensates. In the chiral SU (3) model, quark and gluon condensates are introduced through the explicit symmetry breaking term and the trace anomaly property of the QCD, respectively and are written in terms of the scalar fields $\sigma$ σ , $\zeta$ ζ , $\delta$ δ and $\chi$ χ . Hence, through medium modification of $\sigma$ σ , $\zeta$ ζ , $\delta$ δ and $\chi$ χ fields, we obtain the medium-modified masses and decay constants of D and B mesons. As an application, using ${}^{3}P_{0}$ 3 P 0 model, we calculate the in-medium decay width of the higher charmonium states $\psi(3686)$ ψ ( 3686 ) , $\psi(3770)$ ψ ( 3770 ) and $\chi(3556)$ χ ( 3556 ) to the $D\bar{D}$ D D ¯ pairs, considering the in-medium mass of D mesons. These results may be important to understand the possible outcomes of the high-energy physics experiments, e.g. , CBM and PANDA at GSI, Germany.
Keywords: Quarks – Analysis;
ISSN: 1434-6001
E-ISSN: 1434-601X
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• 2
Article
Language: English
In: The European Physical Journal C, 2017, Vol.77(11), pp.1-18
Description: We calculate the shift in the masses and decay constants of $$D_s(1968)$$ D s ( 1968 ) and $$B_s(5370)$$ B s ( 5370 ) mesons in hot and dense asymmetric strange hadronic matter using QCD sum rules and chiral SU(3) model. In-medium strange quark condensates $$\left\langle \bar{s}s\right\rangle _{\rho _B}$$ s ¯ s ρ B , and gluon condensates $$\left\langle \frac{\alpha _{s}}{\pi } {G^a}_{\mu \nu } {G^a}^{\mu \nu } \right\rangle _{\rho _B}$$ α s π G a μ ν G a μ ν ρ B , to be used in the QCD sum rules for pseudoscalar $$D_s$$ D s and $$B_s$$ B s mesons, are calculated using a chiral SU(3) model. As an application of our present work, we calculate the in-medium decay widths of the excited ( $$c\bar{s}$$ c s ¯ ) states $$D_s^*(2715)$$ D s ∗ ( 2715 ) and $$D_s^*(2860)$$ D s ∗ ( 2860 ) decaying to ( $$D_s(1968),\eta$$ D s ( 1968 ) , η ) mesons. The medium effects in their decay widths are incorporated through the mass modification of the $$D_s(1968)$$ D s ( 1968 ) and $$\eta$$ η mesons. The results of the present investigation may be helpful in understanding the possible outcomes of the future experiments like CBM and PANDA under the FAIR facility.
Keywords: Physics;
ISSN: 1434-6044
E-ISSN: 1434-6052
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• 3
Article
Language: English
In: Journal of the American Chemical Society, 13 January 2010, Vol.132(1), pp.32-3
Description: A one-pot strategy for the nucleation, growth, morphogenesis, and passivation of 1.4 nm Au nanoparticles (NPs) on self-assembled rosette nanotubes (RNTs) is described. Tapping-mode atomic force microscopy, transmission electron microscopy, energy-dispersive X-ray analysis, and selected-area electron diffraction were used to establish the structure and organization of this hybrid material. Notably, we found that the Au NPs formed were nearly monodisperse clusters of Au(55) (1.4-1.5 nm) nestled in pockets on the RNT surface.
Keywords: Particle Size ; Gold -- Chemistry ; Metal Nanoparticles -- Chemistry ; Nanotubes -- Chemistry
ISSN: 00027863
E-ISSN: 1520-5126
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• 4
Article
Language: English
In: Physical Review C, 9/2015, Vol.92(3)
Description: We calculate the effects of finite density and temperature of isospin asymmetric strange hadronic matter, for different strangeness fractions, on the in-medium properties of vector $\left( D^{\ast}, D_{s}^{\ast}, B^{\ast}, B_{s}^{\ast}\right)$ and axial-vector $\left( D_{1}, D_{1s}, B_{1}, B_{1s}\right)$ mesons, using chiral hadronic SU(3) model and QCD sum rules. We focus on the evaluation of in-medium mass-shift and shift in decay constant of above vector and axial-vector mesons. In QCD sum rule approach, the properties, e.g., the masses and decay constants of vector and axial-vector mesons are written in terms of quark and gluon condensates. These quark and gluon condensates are evaluated in the present work within chiral SU(3) model, through the medium modification of, scalar-isoscalar fields $\sigma$ and $\zeta$, the scalar-isovector field $\delta$ and scalar dilaton field $\chi$, in the strange hadronic medium which includes both nucleons as well as hyperons. As we shall see in detail, the masses and decay constants of heavy vector and axial-vector mesons are affected significantly due to isospin asymmetry and strangeness fraction of the medium and these modifications may influence the experimental observables produced in heavy ion collision experiments. The results of present investigations of in-medium properties of vector and axial-vector mesons at finite density and temperature of strange hadronic medium may be helpful for understanding the experimental data from heavy-ion collision experiments in-particular for the Compressed Baryonic Matter (CBM) experiment of FAIR facility at GSI, Germany. Comment: 36 pages and 9 figures. arXiv admin note: substantial text overlap with arXiv:1506.02115
Keywords: Nuclear Theory ; High Energy Physics - Phenomenology;
ISSN: 0556-2813
E-ISSN: 1089-490X
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• 5
Article
Language: English
In: Physical Review C, 8/2018, Vol.98(2)
Description: Masses and decay constants of scalar $D_0$ and $D_{s0}$ mesons in isospin asymmetric strange hadronic matter at finite temperature are evaluated using QCD sum rules and chiral SU(3) model. In-medium light quark condensates, $\left\langle \bar{u}u\right\rangle_{\rho_{B}}$ and $\left\langle \bar{d}d\right\rangle_{\rho_{B}}$, the strange quark condensates, $\left\langle \bar{s}s\right\rangle_{\rho_{B}}$, and the gluon condensates, $\left\langle \frac{\alpha_{s}}{\pi} {G^a}_{\mu\nu} {G^a}^{\mu\nu} \right\rangle_{\rho_{B}}$, needed in QCD sum rule calculations are evaluated using chiral SU(3) model. As an application, we calculate the in-medium partial decay width of scalar $D_0$ ($D_{s0}$) meson decaying to $D$ + $\pi$ ($D_s$+$\pi$) pseudoscalar mesons using $^3 P_0$ model. The medium effects in their decay widths are assimilated through the modification in the masses of these mesons. These results may be helpful to understand the possible outcomes of the future experiments like CBM and PANDA under the FAIR facility where the study of charmed hadrons is one of major goal. Comment: 28 pages, 8 figures
Keywords: High Energy Physics - Phenomenology ; Nuclear Theory;
ISSN: 2469-9985
E-ISSN: 2469-9993
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• 6
Article
Language: English
In: MRS Proceedings, 2011, Vol.1301
Keywords: Engineering;
ISBN: 9781605112787
ISSN: 0272-9172
E-ISSN: 1946-4274
Source: CrossRef
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• 7
Article
Language: English
In: EPJ Web of Conferences, 01 January 2016, Vol.112, p.04001
Description: We calculate the effect of density and temperature of isospin symmetric strange medium on the shift in masses and decay constants of vector D and B mesons using chiral SU(3) model and QCD sum rule approach. In the present investigation the values of quark and gluon condensates are calculated from the chiral SU(3) model and these condensatesare further used as input in the QCD Sum rule framework to calculate the in-medium masses and decay constants of vector D and B mesons. These in medium properties of vector D and B mesons may be helpful to understand the experimental observables of the experiments like CBM and PANDA under FAIR project at GSI, Germany. The results which are observed in present work are also compared with the previous predictions.
Keywords: Physics
ISSN: 21016275
E-ISSN: 2100-014X
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• 8
Article
In: Lung India, 2012, Vol.29(3), p.286-288
Description: Allergic bronchopulmonary aspergillosis (ABPA) is typically associated with asthma. Presence of asthma is one of the minimal essential diagnostic criteria for ABPA. Rarely, ABPA has been described in association with other diseases without asthma. It has so far not been known to complicate pulmonary tuberculosis. We report one such case in a young lady where all other diagnostic criteria were fulfilled. The patient responded to corticosteroids and then had acute exacerbations of ABPA twice, each time requiring an increased dosage of corticosteroids as well as itraconazole and responded favorably.
Keywords: Allergic bronchopulmonary aspergillosis; asthma; tuberculosis
ISSN: 0970-2113
E-ISSN: 0974598X
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• 9
Article
Language: English
In: Science (New York, N.Y.), 02 January 2009, Vol.323(5910), pp.112-6
Description: The assembly of nanoparticles into three-dimensional (3D) architectures could allow for greater control of the interactions between these particles or with molecules. DNA tubes are known to form through either self-association of multi-helix DNA bundle structures or closing up of 2D DNA tile lattices. By the attachment of single-stranded DNA to gold nanoparticles, nanotubes of various 3D architectures can form, ranging in shape from stacked rings to single spirals, double spirals, and nested spirals. The nanoparticles are active elements that control the preference for specific tube conformations through size-dependent steric repulsion effects. For example, we can control the tube assembly to favor stacked-ring structures using 10-nanometer gold nanoparticles. Electron tomography revealed a left-handed chirality in the spiral tubes, double-wall tube features, and conformational transitions between tubes.
Keywords: Gold ; DNA -- Chemistry ; Metal Nanoparticles -- Chemistry ; Nanotubes -- Chemistry
ISSN: 00368075
E-ISSN: 1095-9203
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• 10
Article
Language: English
In: Journal of the American Chemical Society, 25 June 2008, Vol.130(25), pp.7820-1
Description: Assembly of gold nanoparticles (AuNP) into designer architectures with reliablity is important for nanophotonics and nanoelectronics applications. Toward this goal we present a new strategy to prepare AuNPs monofunctionalized with lipoic acid modified DNA oligos. This strategy offers increased bonding strength between DNA oligos and AuNP surface. These conjugates are further selectively mixed with other DNA strands and assembled into fixed sized DNA nanostructures carring a discrete number of AuNPs at desired positions. Atomic force microscopy imaging reveals a dramatically improved yield of the AuNPs on DNA tile structure compared to the ensembles using monothiolate AuNP-DNA conjugates.
Keywords: Nanotechnology ; DNA -- Chemistry ; Gold -- Chemistry ; Nanoparticles -- Chemistry
ISSN: 00027863
E-ISSN: 1520-5126
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