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Search Results: 1 - 10 of 1066 matches for " Rusa Mandal "
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Implications from ${B\to K^*\ell^+\ell^-}$ observables using $3 \text{fb}^{-1}$ of LHCb data
Rusa Mandal,Rahul Sinha
Physics , 2015,
Abstract: The decay mode $B\to K^*\ell^+\ell^-$ results in the measurement of a large number of related observables by studying the angular distribution of the decay products and is regarded as a sensitive probe of physics beyond the standard model. Recently, LHCb has measured several of these observables using $3\text{fb}^{-1}$ data, as a binned function of $q^2$, the dilepton invariant mass squared. We show how data can be used without any approximations to extract theoretical parameters describing the decay and to obtain a relation amongst observables within the standard model. We find three kinds of significant disagreement between theoretical expectations and values obtained by fits. The values of the form factors obtained from experimental data show significant discrepancies when compared with theoretical expectations in several $q^2$ bins. We emphasize that this discrepancy cannot arise due to resonances and non-factorizable contributions from charm loops. Further, a relation between form factors expected to hold at large $q^2$ is very significantly violated. Finally, the relation between observables also indicates some deviations in the forward-backward asymmetry in the same $q^2$ regions. These discrepancies are possible evidence of physics beyond the standard model.
Testing New Physics Effects in $B \to K^*\ell^+\ell^-$
Rusa Mandal,Rahul Sinha,Diganta Das
Physics , 2014, DOI: 10.1103/PhysRevD.90.096006
Abstract: It is generally believed that the decay mode $B\to K^*\ell^+\ell^-$ is one of the best modes to search for physics beyond the standard model. The angular distribution enables the independent measurement of several observables as a function of the dilepton invariant mass. The plethora of observables so obtained enable unique tests of the standard model contributions. We start by writing the most general parametric form of the standard model amplitude for $B\to K^*\ell^+\ell^-$ taking into account comprehensively all contributions within SM. These include all short-distance and long-distance effects, factorizable and non-factorizable contributions, complete electromagnetic corrections to hadronic operators up to all orders, resonance contributions and the finite lepton and quark masses. The parametric form of the amplitude in the standard model results a new relation involving all the $CP$ conserving observables. The derivation of this relation only needs the parametric form of the amplitude and not a detailed calculation of it. Hence, we make no approximations, however, innocuous. The violation of this relation will provide a smoking gun signal of new physics. We use the $1 \text{fb}^{-1}$ LHC$b$ data to explicitly show how our relation can be used to test standard model and search for new physics that might contribute to this decay.
An Intervention Study in Malnutrition Among Infants in a Tribal Community of West Bengal
Mandal ON
Indian Journal of Community Medicine , 2005,
Abstract:
Revisiting Laws of Black Hole Mechanics and Violation of Null Energy Condition  [PDF]
Susobhan Mandal
Journal of High Energy Physics, Gravitation and Cosmology (JHEPGC) , 2019, DOI: 10.4236/jhepgc.2019.51004
Abstract: Most of the important and powerful theorems in General Relativity such as singularity theorems and the theorems applied for null horizons depend strongly on the energy conditions. However, the energy conditions on which these theorems are based on, are beginning to look at less secure if one takes into accounts quantum effects which can violate these energy conditions. Even there are classical systems that can violate these energy conditions which would be problematic in validation of those theorems. In this article, we revisit to a class of such important theorems, the laws of black hole mechanics which are meant to be developed on null like killing horizons using null energy condition. Then we show some classical and quantum mechanical systems which violate null energy condition based on which the above theorem stands.
Broken Charges Associated with Classical Spacetime Symmetries under Canonical Transformation in Real Scalar Field Theory  [PDF]
Susobhan Mandal
Journal of High Energy Physics, Gravitation and Cosmology (JHEPGC) , 2019, DOI: 10.4236/jhepgc.2019.51009
Abstract: We know from Noether’s theorem that there is a conserved charge for every continuous symmetry. In General Relativity, Killing vectors describe the spacetime symmetries and to each such Killing vector field, we can associate conserved charge through stress-energy tensor of matter which is mentioned in the article. In this article, I show that under simple set of canonical transformation of most general class of Bogoliubov transformation between creation, annihilation operators, those charges associated with spacetime symmetries are broken. To do that, I look at stress-energy tensor of real scalar field theory (as an example) in curved spacetime and show how it changes under simple canonical transformation which is enough to justify our claim. Since doing Bogoliubov transformation is equivalent to coordinate transformation which according to Einstein’s equivalence principle is equivalent to turn on effect of gravity, therefore, we can say that under the effect of gravity those charges are broken.
Heavy Metals in Soils around the Cement Factory inRockfort, Kingston, Jamaica  [PDF]
A. Mandal, M. Voutchkov
International Journal of Geosciences (IJG) , 2011, DOI: 10.4236/ijg.2011.21005
Abstract: This study deals with the distribution of heavy metals in soils around one of the most important industries in Kingston, Jamaica i.e. the Carib Cement factory at Rockfort. The dust emitted from the Caribbean Cement Company Limited (Carib Cement), located in Rockfort, Kingston, gets deposited in course of time over the soil, leaves and forms a grey cover on the surrounding soils. Geochemical analysis of the top soil, collected from the present study area has been undertaken to assess the impact of the dust emitted from the cement factory and its effect on the surrounding ecosystem. A total of seventeen top soil samples of 0-10 cm depth were collected from the close vicinity of the Rockfort and the Harbour view area and analysed by INAA, AAS, XRF for major, minor and trace elements. Results show that the top soils of the study area are enriched in Pb, Zn, Cr, Cd, V, Pb, and Hg which are released into the air from the cement kilns. Results show that the soils are enriched in Ca with a maximum value of 18% followed by Al, Fe and Na. Heavy metals in the soils of the study area shows relatively high concentrations of zinc with a maximum of 132 ppm followed by Cr (57) ppm and Pb (32) ppm. Maximum concentrations were found in soils sampled at a distance of 2-3 m from the cement factory as opposed to samples collected much further ie from the Harbour View area. High concentrations of the heavy metals in the soils near the cement factory as opposed to those further away can be due to the emissions from the factory. A significant contribution can also come from traffic emissions as the study area is located along one of the busiest street of Kingston, Jamaica.
Informal Wage, Informal Price and Extortion under Migration and Tariff Reform*  [PDF]
Biswajit Mandal, Saswati Chaudhuri
Modern Economy (ME) , 2011, DOI: 10.4236/me.2011.21006
Abstract: In this paper we propose a theoretical model where formal and informal sectors co-exist in tandem. Trade union segregates some labor from being formal. Capital is not allowed to freely move between formal and informal sectors. Using this sort of framework it has been shown that immigration of unskilled workers re-duces the return to informal labor and makes the informal good relatively cheap. A tariff slash also impinges on similar kind of results. In both the cases informal capitalists gain. Moreover, what is more striking is that both migration and tariff reform are equally bad for the economy as a whole since these policies enhance the ‘unproductive’ element or labor in the society which is really costly as these laborers could have been used to produce some more consumable commodities.
Mathematical Model to Locate Interference of Blast Waves from Multi-Hole Blasting Rounds  [PDF]
Sujit Kumar Mandal
Engineering (ENG) , 2012, DOI: 10.4236/eng.2012.43019
Abstract: Maximum charge per delay in a blasting round is universally accepted as the influencing parameter to quantify magni-tude of vibration for any distance of concern. However, for any blasting round experimental data reveals that for same charge per delay magnitude of vibration varies with total charge. Considering linear transmission of blast waves, the paper firstly investigates into the influence of explosive weight, blast design parameters and geology of strata on magnitude and characteristics of vibration parameters and thereafter communicates that possibly interference of blast waves generated from same and different holes of a blasting round result into variation in vibration magnitude. The paper lastly developed a mathematical model to evaluate points of interference of blast waves generated from single- and multi-hole blasting round.
In Vitro Organogenesis of Quisqualis indica Linn.  [PDF]
Jaydip Mandal, Undurthy Laxminarayana
American Journal of Plant Sciences (AJPS) , 2012, DOI: 10.4236/ajps.2012.39154
Abstract: Shoot organogenesis and plant regeneration were achieved on callus derived from leaf section and stem base explants of Quisqualis indica (Combretaceae). In vitro cultures were established using nodal segments obtained from mature field-grown shrubby plants. For the development of optimized protocol, different types and concentrations of plant growth regulators were used to induce adventitious shoot regeneration via callus from leaf section and one-node stem base explants obtained from in vitro regenerated micro shoots and direct field-grown newly flush-off shoots. The TDZ was considered to be the best among the cytokinins (6-benzyladenine (BA), 6-(?-?, dimethylallyamino purine) (2-iP) and thidiazuron (TDZ) added to the Murashige and Skoog’s medium (MS) for adventitious shoot productions. A combination of 1.0 mg/L TDZ and 0.5 mg/L GA3 was most effective in stimulating callus induction and adventitious shoot regeneration from the leaf section derived calli with an average of 6 shoots per callus explant and an average of 8 shoots per callus explant originated from one-node stem base explants. In vitro raised shoots were sub-cultured on MS medium supplemented with 1.0 mg/L BA and 0.5 mg/L GA3 for further shoot growth. Maximum rooting of in vitro regenerated shoots was obtained on MS medium supplemented with either 0.5 mg/L indole-3-acetic acid (IAA) or indole-3-butyric acid (IBA) individually or a combination of 0.5 mg/L IAA and 0.5 mg/L IBA. Plantlets raised in vitro were acclimatized and subsequently transferred to experimental field.
Effectiveness of Bumetanide Infusion in Treatment of Generalized Edema and Congestive Heart Failure  [PDF]
Anil K. Mandal
Open Journal of Internal Medicine (OJIM) , 2014, DOI: 10.4236/ojim.2014.43012
Abstract: Generalized edema (anasarca) is common in nephrotic syndrome which rarely produces shortness of breath. Increased shortness of breath associated with rapid weight gain and generalized edema signify congestive heart failure (CHF). Loop diuretics consisting of furosemide (Lasix®), bumetanide (Bumex®), torsemide (Demadex®) or ethacrynic acid (Edecrin) are effective diuretics to treat anasarca. However, efficacy varies depending on the renal function. Loop diuretic given orally or by intravenous boluses produce good urine output but overall response in reducing edema or shortness of breath as in CHF is less than optimum. Although literature information is very limited, continuous bumetanide infusion for 72 to 96 hours is found to be very effective in producing subjective relief of shortness of breath as well as objective improvement such as reduction in brain natriuretic peptide in CHF and improved kidney function, so that diuresis is sustained even after discontinuation of the infusion. Decrease in kidney function and electrolytes and acid-base imbalance are common but they are reversible with prompt replacement therapy. They pose no threat to life.
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