2,699 research outputs found

    Threshold Effects on Quasi-degenerate Neutrinos with High-scale Mixing Unification

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    We consider threshold effects on neutrino masses and mixings in a recently proposed model for understanding large solar and atmospheric mixing angles using radiative magnification for the case of quasi-degenerate neutrinos. We show that the magnitude of the threshold effects is sufficient to bring concordance between the predictions of this model and latest data from KamLAND{\rm KamLAND} and SNO{\rm SNO} on observations of neutrino oscillations.Comment: Four pages, no figure

    New Uncertainties in QCD-QED Rescaling Factors using Quadrature Method

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    In this paper we briefly outline the quadrature method for estimating uncertainties in a function of several variables and apply it to estimate the numerical uncertainties in QCD-QED rescaling factors. We employ here the one-loop order in QED and three-loop order in QCD evolution equations of fermion mass renormalization. Our present calculations are found to be new and also reliable compared to the earlier values employed by various authors.Comment: 14 page

    Revamped vaccination policy in India, need of the hour

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    The unprecedented COVID pandemic has caused catastrophic loss all over the world. India has faced a flabbergasting second COVID wave. The current COVID mutant strain is more virulent and has become a variant of concern (VOC) with its high infectivity rate. The current second wave is more detrimental when compared to the first wave, where its transmissibility is high, affecting the younger generation, and even the mortality rate is high. Currently, there is no specific treatment against COVID-19. The health care workers (HCW’s) have been fighting the pandemic tirelessly since the beginning of the pandemic, and many were affected, and severe loss of HCWs occurred. The only ray of hope in fighting against this deadly virus is vaccination. Studies have shown that COVID vaccination is effective in preventing the severity of the disease. Hence vaccination is now is the need of the hour. COVID vaccination has to be taken rampant with vaccinating every citizen of the country in the current crisis. The government of India should make serious efforts that vaccination is available and accessible to everyone. With every citizen being vaccinated, one can flatten the current wave and also can prevent further outbreaks

    Non-invasive Diagnostic Measures of Sensorineural Hearing Loss in Chinchillas

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    According to the World Health Organization, disabling hearing loss affects nearly 466 million people worldwide. Sensorineural hearing loss (SNHL), which is characterized as damage to the inner ear (e.g., cochlear hair cells) and/or to the neural pathways connecting the inner ear and brain, accounts for 90% of all disabling hearing loss. More concerning is that significant perceptual and physiological aspects of SNHL remain “hidden” from standard clinical diagnostics. Hidden hearing loss (HHL) manifests as the inability to understand speech in loud, noisy environments (e.g., listening in a noisy restaurant) despite a normal audiogram (i.e., normal detection of soft sounds). Recently, HHL has been suggested to result from cochlear synaptopathy, a significant loss of inner-hair-cell/ afferent-nerve synaptic terminals after an acoustic over-exposure causing “only” a temporary threshold shift (TTS), e.g., after a rock concert. In this study, three physiological non-invasive diagnostic measures of HHL will be evaluated in chinchillas: otoacoustic emissions, auditory brainstem responses, and middle-ear-muscle reflex strength. As a first step, the effect of anesthesia will be evaluated. Four animals will be tested twice while awake and then also twice while under anesthesia (xylazine and ketamine). The repeatability, accuracy, and precision of each measure will be examined. Future work will include collecting these measures before and after TTS-inducing noise exposure. The long-term goal of this study is to establish and characterize reliable and efficient HHL measures in the lab using our noise-induced synaptopathy chinchilla model, and then to translate the animal results into a plausible clinical HHL diagnostic for humans

    COVID-19 pandemic: a narrative review on legislative and regulatory framework in India for disaster and epidemic

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    Public health legislation plays an important role in the containment of any epidemic or pandemic. During a pandemic, it might be necessary to override the existing laws or (individual) human rights for the containment of the pandemic. The objective of the study is to review the legal framework pertaining to COVID-19 pandemic preparedness in India. This study has been done as an unsystematic narrative review where various legislations were assembled from electronic data base, websites from various legislative and Ministries and discussion with experts. Owing to contain the spread of the novel coronavirus Government of India announced nationwide lockdown on 24th March, 2020.  For proper implementation of lockdown measures various legislative laws belonging to different ministries is required. There are two pioneer acts namely The Epidemic disease act of 1897 and The Disaster management act of 2005. Under these two acts the government has laid down various rules and regulations that have to be followed during lockdown. This article describes the need for the law in a crisis like this and various legislations that have been implemented during lockdown

    Radiative Generation of the LMA Solution from Small Solar Neutrino Mixing at the GUT Scale

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    We show that in see-saw models with small or even vanishing lepton mixing angle θ12\theta_{12}, maximal θ23\theta_{23}, zero θ13\theta_{13} and zero CP phases at the GUT scale, the currently favored LMA solution of the solar neutrino problem can be obtained in a rather natural way by Renormalization Group effects. We find that most of the running takes place in the energy ranges above and between the see-saw scales, unless the charged lepton Yukawa couplings are large, which would correspond to a large tanβ\tan \beta in the Minimal Supersymmetric Standard Model (MSSM). The Renormalization Group evolution of the solar mixing angle θ12\theta_{12} is generically larger than the evolution of θ13\theta_{13} and θ23\theta_{23}. A large enhancement occurs for an inverted mass hierarchy and for a regular mass hierarchy with m2m1m2+m1|m_2 - m_1| \ll |m_2 + m_1|. We present numerical examples of the evolution of the lepton mixing angles in the Standard Model and the MSSM, in which the current best-fit values of the LMA mixing angles are produced with vanishing solar mixing angle θ12\theta_{12} at the GUT scale.Comment: 10 pages, 6 figures; reference added, minor changes in the text; results unchanged; final version to appear in JHE

    Search for pair production of heavy vector-like quarks decaying into high-pT W bosons and top quarks in the lepton-plus-jets final state in pp collisions at √s=13 TeV with the ATLAS detector

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    A search is presented for the pair production of heavy vector-like B quarks, primarily targeting B quark decays into a W boson and a top quark. The search is based on 36.1 fb−1 of pp collisions at s√=13 TeV recorded in 2015 and 2016 with the ATLAS detector at the CERN Large Hadron Collider. Data are analysed in the lepton-plus-jets final state, characterised by a high-transverse-momentum isolated electron or muon, large missing transverse momentum, and multiple jets, of which at least one is b-tagged. No significant deviation from the Standard Model expectation is observed. The 95% confidence level lower limit on the B mass is 1350 GeV assuming a 100% branching ratio to Wt. In the SU(2) singlet scenario, the lower mass limit is 1170 GeV. The 100% branching ratio limits are found to be also applicable to heavy vector-like X production, with charge +5/3, that decay into Wt. This search is also sensitive to a heavy vector-like B quark decaying into other final states (Zb and Hb) and thus mass limits on B production are set as a function of the decay branching ratios