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B. Ananthanarayan

Bio: B. Ananthanarayan is an academic researcher from Indian Institute of Science. The author has contributed to research in topics: Unitarity & Pion. The author has an hindex of 27, co-authored 188 publications receiving 3469 citations. Previous affiliations of B. Ananthanarayan include Physical Research Laboratory & University of Bern.


Papers
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Journal ArticleDOI
TL;DR: In this paper, the Roy equations admit physically acceptable solutions only within a band of the (a_0^0,a_ 0^2) plane, and it is shown that the data on the reactions e+e- -> pi pi and tau-to-pi pi nu reduce the width of this band quite significantly.

335 citations

Journal ArticleDOI
TL;DR: In this article, the Roy equations admit physically acceptable solutions only within a band of the (a_0^0,a_ 0^2) plane, and it is shown that the data on the reactions e+e- -> pi pi and tau-to-pi pi nu reduce the width of this band quite significantly.
Abstract: We analyze the Roy equations for the lowest partial waves of elastic pi pi scattering and demonstrate that the two S-wave scattering lengths a_0^0 and a_0^2 are the essential parameters in the low energy region: Once these are known, the available experimental information determines the behaviour near threshold to within remarkably small uncertainties. An explicit numerical representation for the energy dependence of the S- and P-waves is given and it is shown that the threshold parameters of the D- and F-waves are also fixed very sharply in terms of a_0^0 and a^2_0. In agreement with earlier work, which is reviewed in some detail, we find that the Roy equations admit physically acceptable solutions only within a band of the (a_0^0,a_0^2) plane. We show that the data on the reactions e+e- -> pi pi and tau -> pi pi nu reduce the width of this band quite significantly. Furthermore, we discuss the relevance of the decay K -> pi pi e nu in restricting the allowed range of a_0^0, preparing the grounds for an analysis of the forthcoming precision data on this decay and on pionic atoms. We expect these to reduce the uncertainties in the two basic low energy parameters very substantially, so that a meaningful test of the chiral perturbation theory predictions will become possible.

284 citations

Journal ArticleDOI
TL;DR: In this paper, the International Linear Collider (ILC) is used for discovering physics beyond the Standard Model and for unraveling the structure of the underlying physics, and the physics return can be maximized by the use of polarized beams.
Abstract: The proposed International Linear Collider (ILC) is well-suited for discovering physics beyond the Standard Model and for precisely unraveling the structure of the underlying physics. The physics return can be maximized by the use of polarized beams. This report shows the paramount role of polarized beams and summarizes the benefits obtained from polarizing the positron beam, as well as the electron beam. The physics case for this option is illustrated explicitly by analyzing reference reactions in different physics scenarios. The results show that positron polarization, combined with the clean experimental environment provided by the linear collider, allows to improve strongly the potential of searches for new particles and the identification of their dynamics, which opens the road to resolve shortcomings of the Standard Model. The report also presents an overview of possible designs for polarizing both beams at the ILC, as well as for measuring their polarization.

266 citations

Journal ArticleDOI
TL;DR: In this paper, the International Linear Collider (ILC) is used for discovering physics beyond the Standard Model and for unraveling the structure of the underlying physics, and the physics return can be maximized by the use of polarized beams.

248 citations

Journal ArticleDOI
TL;DR: The year 2016 saw a most dramatic scientific event in the month of February with the announcement of the observation of gravitational waves by the Advanced LIGO collaboration as mentioned in this paper, which used as its principles, laser inteferometry with two constituent ultra-quiet laboratories separated by thousands of kilometres.
Abstract: The year 2016 saw a most dramatic scientific event in the month of February with the announcement of the observation of gravitational waves by the Advanced LIGO collaboration. This complex experiment uses as its principles, laser inteferometry with two constituent ultra-quiet laboratories separated by thousands of kilometres.

218 citations


Cited by
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Journal ArticleDOI
01 Dec 1949-Nature
TL;DR: Wentzel and Jauch as discussed by the authors described the symmetrization of the energy momentum tensor according to the Belinfante Quantum Theory of Fields (BQF).
Abstract: To say that this is the best book on the quantum theory of fields is no praise, since to my knowledge it is the only book on this subject But it is a very good and most useful book The original was written in German and appeared in 1942 This is a translation with some minor changes A few remarks have been added, concerning meson theory and nuclear forces, also footnotes referring to modern work in this field, and finally an appendix on the symmetrization of the energy momentum tensor according to Belinfante Quantum Theory of Fields Prof Gregor Wentzel Translated from the German by Charlotte Houtermans and J M Jauch Pp ix + 224, (New York and London: Interscience Publishers, Inc, 1949) 36s

2,935 citations

20 Jul 1986

2,037 citations