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J. Balasubramanyam

Publications and source records attributed to J. Balasubramanyam.

6 recordsLinked to original sources
arXiv2009

Decay of Polarized Delta

The resonance $Δ(1232)$ with spin-parity ${3 \over 2}^+$, which contributes dominantly to the reactions like $γN \to πN$ and $NN \to NNπ$ at intermediate energies, may be expected to be produced in characteristically different polarized spin states. As such an analysis of the decay of polarized delta is presented, which may be utilized to probe empirically the production mechanism. It is shown that measurements of the angular distributions of the pion and the polarization of the nucleon arising out of ${\vecΔ}$ decay can determine empirically the Fano statistical tensors characterizing the ${\vecΔ}$.

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arXiv2008

Omega meson production in pp collisions with a polarized beam

Model independent formulae are derived for the beam analyzing power $A_y$ and beam to meson spin transfers in $pp \to pp ω$ taking into consideration all the six threshold partial wave amplitudes covering the $Ss, Sp$ and $Ps$ channels. Attention is also focussed on the empirical determination of the lowest three partial wave amplitudes $f_1, f_2, f_3$ without any discrete ambiguities.

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arXiv2007

Irreducible tensor approach to spin observables in photo production of mesons with arbitrary spin-parity $s^π$

A theoretical formalism leading to elegant derivation of formulae for all spin observables is outlined for photo production of mesons with arbitrary spin parity $s^π$. The salient features of this formalism based on irreducible tensor techniques are i) the number of independent irreducible tensor amplitudes is $4(2s+1)$, ii) a single compact formula is sufficient to express these amplitudes in terms of allowed electric and magnetic multipole amplitudes and iii) all the spin observables including beam analyzing powers as well as the differential cross section are expressible in terms of bilinear irreducible tensors of rank 0 to $2(s+1)$. The relationship between the irreducible tensor amplitudes and the helicity amplitudes is elucidated in general and explicit expressions for the helicity amplitudes are given in terms of the irreducible tensor amplitudes in the particular cases of pseudoscalar and vector meson photo production. The connection between the irreducible tensor amplitudes introduced here and the well known CGLN amplitudes for photo production of pseudoscalar mesons is also established.

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arXiv2005

Omega Production in pp Collisions

A model-independent irreducible tensor formalism which has been developed earlier to analyze measurements of $\vec{p}\vec{p}\to pp π^\circ$, is extended to present a theoretical discussion of $\vec{p}\vec{p}\to pp ω$ and the polarization of $ω$ in $pp\to pp \vecω$. The recent measurement of unpolarized differential cross section for $pp\to pp ω$ is analyzed using this theoretical formalism.

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