188 research outputs found

    Hadronic Decay of Bc Meson to Pseudoscalar and Vector mesons using the Isgur-Scora-Grinstein-Wise Model

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    The extensive study of B meson decays has led to precise measurements of the standard model parameter

    Neutrino Physics: Leading Pathway to New Discovery

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    In this project i have discussed about neutrino oscillation in matter and its implication on astrophysical objects e.g.neutron star

    Flavour physics and CP violation

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    It is well known that the study of flavour physics and CP violation is very important to critically test the Standard Model and to look for possible signature of new physics beyond it. The observation of CP violation in kaon system in 1964 has ignited a lot of experimental and theoretical efforts to understand its origin and to look for CP violation effects in other systems besides the neutral kaons. The two B-factories BABAR and BELLE, along with other experiments, in the last decade or so made studies in flavour physics and CP violation a very interesting one. In this article we discuss the status and prospectives of the flavour physics associated with the strange, charm and bottom sectors of the Standard Model. The important results in kaon sector will be briefly discussed. Recently, mixing in the charm system has been observed, which was being pursued for quite some time without any success. The smallness of the mixing parameters in the charm system is due to the hierarchical structure of the CKM matrix. Interestingly, so far we have not found CP violation in the charm system but in the future, with more dedicated experiments at charm threshold, the situation could change. Many interesting observations have been made in the case of bottom mesons and some of them show some kind of deviations from that of the Standard Model expectations which are mainly associated with the b → s flavour changing neutral current transitions. It is long believed that the B s system could be the harbinger of new physics since it is a system in which both bottom and strange quarks are the constituents. Recently, D0 and CDF announced their result for the B s mixing which is claimed to be the first possible new physics signature in the flavour sector. We plan to touch upon all important issues pointing out both theoretical and experimental developments and future prospects in this review article

    Quantifying the second resonance effect in neutrino-Argon interaction using DUNE Near Detector

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    Heavy nuclear targets are used in neutrino oscillation experiments to boost the statistics of neutrino interactions. The complex nuclear environment contributes to the systematic uncertainty as the inevitable nuclear effects. Inadequate knowledge of the neutrino interaction with the nuclear target along with the imperfect reconstruction of neutrino energy seeds uncertainty in the cross-section. Uncertainty in the cross-section propagates as a systematic uncertainty in the determination of the neutrino oscillation parameters. For precision physics, future neutrino oscillation experiments will require understanding of the neutrino nucleus-interaction and neutrino energy reconstruction with a high level of accuracy. In this work, we aim to quantify the second resonance contributions to the neutrino interaction in Argon for reducing systematic uncertainties in the physics predictions for the DUNE Near Detector (ND). We present the results as the ratio distribution of [Formula presented] for Δ(1232) resonance and the extended analysis to the second resonance region P11(1440), D13(1520), and S11(1535). This inclusion shows a significant contribution to the total cross-section compared to the case where only the Δ(1232) resonance is considered

    Effective theory approach to new physics in b→u and b→c leptonic and semileptonic decays

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    Recent measurements of exclusive B-→τ-ν and B0→π+l-ν̄l decays via the b→ulν transition process differ from the standard model expectation and, if they persist in future B experiments, will be a definite hint of the physics beyond the standard model. Similar hints of new physics have been observed in b→c semileptonic transition processes as well. BABAR measures the ratio of branching fractions of B→(D,D*)τν to the corresponding B→(D,D*)lν, where l represents either an electron or a muon, and finds 3.4σ discrepancy with the standard model expectation. In this context, we consider a most general effective Lagrangian for the b→ulν and b→clν transition processes in the presence of new physics and perform a combined analysis of all the b→u and b→c semi-(leptonic) data to explore various new physics operators and their couplings. We consider various new physics scenarios and give predictions for the Bc→τν and B→πτν decay branching fractions. We also study the effect of these new physics parameters on the ratio of the branching ratios of B→πτν to the corresponding B→πlν decays

    Coherent State and Its Application

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    In this Thesis we construct coherent states and its application in future. Pure Coherent states are known as the most Classical state in Quantum mechanics. These states minimize the quantum mechanical uncertainty between x and p obey the classical equation of motion for the harmonic oscillator. And other is that coherent state in quantum computation. This dissertation discusses mainly transmission of coherent state qubits, generation of cat states and entanglement purification of any stabilizer state. A quantum computer is any device for computation that makes direct use of distinctively quantum mechanical phenomena, such as superposition and entanglement, to perform on operation on data

    CP Violation and Sterile Neutrino

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    Neutrinos are the most mysterious and interesting among all elementary particles. It does not have charge and it is massless according to S.M. Recent experiments indicate that neutrinos can oscillate from one avor to another avor which indicates the fact that neutrinos have tiny mass. The determination of mixing parameter and mass of neutrino is an interesting question in high energy physics. Furthermore, neutrinos could also be related to the matter-antimatter asymmetry of the universe, understanding of which requires determination of CP violation in neutrino sector. In this project, I have discussed about CP violation in neutrino oscillation in 3+1 scheme and compared it with ordinary three avour oscillation. The difference between oscillation probabilities of neutrinos and anti-neutrinos leads to CP violation. I investigated CP violation in neutrino sector in vacuum and matter using 1. three ordinary neutrinos(Ve; Vp and Vr) and with 2. one sterile neutrino withthree ordinary neutrinos ( 3+1 scheme)

    Phenomenological Studies of B mesons

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    The Standard Model (SM) is the most successful theoretical framework of particle physics ever formulated till today which says that matter ultimately consists of two types particles namely leptons and quarks, and it unifies the electromagnetic and weak forces, and also it describes the interaction between fundamental particles in terms of exchange of the fundamental force particles i.e. gauge bosons. The latest monumental discovery of a Higgs like particle by CMS and ATLAS further confirms the validity of the SM for which Peter Higgs and Francois Englert were awarded the Nobel Prize for the year 2013 in Physics

    Quantum Computation and Quantum Information

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    In this project, basics of quantum computation and quantum information is studied.The present work starts with the study of linear algebra which is essential to describe the state quantum systems. A basic description of Church Turing thesis is discussed.The basics of linear algebra is used to describe qubits and gates. Finally using circuit model of computation, circuits are used to implement quantum algorithms

    Evidence for a vector charmonium-like state in e+e−→D+sD∗s2(2573)−+c.c.

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    We report the measurement of e+e−→D+sD∗s2(2573)−+c.c. via initial-state radiation using a data sample of an integrated luminosity of 921.9 fb−1 collected with the Belle detector at the Υ(4S) and nearby. We find evidence for an enhancement with a 3.4σ significance in the invariant mass of D+sD∗s2(2573)−+c.c. The measured mass and width are (4619.8+8.9−8.0(stat.)±2.3(syst.)) MeV/c2 and (47.0+31.3−14.8(stat.)±4.6(syst.)) MeV, respectively. The mass, width, and quantum numbers of this enhancement are consistent with the charmonium-like state at 4626 MeV/c2 recently reported by Belle in e+e−→D+sDs1(2536)−+c.c. The product of the e+e−→D+sD∗s2(2573)−+c.c. cross section and the branching fraction of D∗s2(2573)−→D¯0K− is measured from D+sD∗s2(2573)− threshold to 5.6 GeV
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