Articles written in Pramana – Journal of Physics
Volume 19 Issue 3 September 1982 pp 237-248 Nuclear And Particle Physics
Within the framework of the survival hypothesis for Higgs scalars we comprehensively examine the following question: could there be neutron-antineutron oscillations in SO(10) grand unified theories which would be detectable in the forthcoming experiments? In the process of answering this, we critically discuss and supplement the existing knowledge of the relevant patterns of SO(10) symmetry breakdown in relation to the said oscillations. However, our conclusions are negative with the oscillation period being 1025 years or higher.
Volume 52 Issue 5 May 1999 pp 1- Rapid Communication
Results for solar neutrino detection from the SuperKamiokande collaboration have been presented recently while those from the Sudbury Neutrino Observatory are expected in the near future. These experiments are sensitive to the8B neutrinos from the sun, the shape of whose spectrum is well-known but the normalization is less certain. We propose several variables, insensitive to the absolute flux of the incident beam, which probe the shape of the observed spectrum and can sensitively signal neutrino oscillations. They provide methods to extract the neutrino mixing angle and mass splitting from the data and also to distinguish oscillation to sequential neutrinos from those to a sterile neutrino.
Volume 54 Issue 1 January 2000 pp 35-46
A brief introduction to the phenomena of vacuum neutrino oscillations and resonant flavour conversion is presented with a heavy pedagogic leaning. Variants of these ideas, e.g., neutrino helicity flip in a magnetic field, violation of the equivalence principle, etc. are outlined. A few vexing issues pertaining to the quantum mechanics of neutrino oscillations are discussed. Expectations from some of the future experiments are summarized.
Volume 55 Issue 1-2 July 2000 pp 307-313
This report summarises the work done in the ‘Beyond the Standard Model’ working group of the Sixth Workshop on High Energy Physics Phenomenology (WHEPP-6) held at the Institute of Mathematical Sciences, Chennai, Jan 3–15, 2000. The participants in this working group were: R Adhikari, B Ananthanarayan, K P S Balaji, Gour Bhattacharya, Gautam Bhattacharyya, Chao-Hsi Chang (Zhang). D Choudhury, Amitava Datta, Anindya Datta, Asesh K Datta, A Dighe, N Gaur, D Ghosh, A Goyal, K Kar, S F King, Anirban Kundu, U Mahanta, R N Mohapatra, B Mukhopadhyaya, S Pakvasa, P N Pandita, M K Parida, P Poulose, G Raffelt, G Rajasekaran, S Rakshit, Asim K Ray, A Raychaudhuri, S Raychaudhuri, D P Roy, P Roy, S Roy, K Sridhar and S Vempati.
Volume 55 Issue 1-2 July 2000 pp 347-355
MVN Murthy Urjit A Yajnik KRS Balaji G Bhattacharyya Amol Dighe Shashikant Dugad ND Hari Dass PK Kabir Kamales Kar D Indumathi John G Learned Debasish Majumdar NK Mondal MVN Murthy SN Nayak Sandip Pakvasa Amitava Raychaudhuri RS Raghavan G Rajasekaran R Ramachandran Alak K Ray Asim K Ray Saurabh Rindani HS Sharatchandra Rahul Sinha Nita Sinha S Umasankar Urjit A Yajnik
We have identified some important and worthwhile physics opportunities with a possible neutrino detector located in India. Particular emphasis is placed on the geographical advantage with a stress on the complimentary aspects with respect to other neutrino detectors already in operation.
Volume 60 Issue 2 February 2003 pp 405-409
Raj Gandhi Kamales Kar S Uma Sankar Abhijit Bandyopadhyay Rahul Basu Pijushpani Bhattacharjee Biswajoy Brahmachari Debrupa Chakraborti M Chaudhury J Chaudhury Sandhya Choubey E J Chun Atri Desmukhya Anindya Datta Gautam Dutta Sukanta Dutta Anjan Giri Sourendu Gupta Srubabati Goswami Namit Mahajan H S Mani A Mukherjee Biswarup Mukhopadhyaya S N Nayak M Randhawa Subhendu Rakshit Asim K Ray Amitava Raychaudhuri D P Roy Probir Roy Suryadeep Roy Shiv Sethi G Sigl Arunansu Sil N Nimai Singh Mark Vagins Urjit Yagnik
This is the report of neutrino and astroparticle physics working group at WHEPP-7. Discussions and work on CP violation in long baseline neutrino experiments, ultra high energy neutrinos, supernova neutrinos and water Cerenkov detectors are discussed.
Volume 86 Issue 2 February 2016 pp 407-417 Special: Neutrino Physics
𝜃13 is small compared to the other neutrino mixing angles. The solar mass splitting is about two orders smaller than the atmospheric splitting. We indicate how both could arise from a perturbation of a more symmetric structure. The perturbation also affects the solar mixing angle and can tweak alternate mixing patterns such as tribimaximal, bimaximal, or other variants to viability. For real perturbations only normal mass ordering with the lightest neutrino mass less than 10−2 eV can accomplish this goal. Both mass orderings can be accommodated by going over to complex perturbations if the lightest neutrino is heavier. The CP-phase in the lepton sector, fixed by 𝜃13 and the lightest neutrino mass, distinguishes different options.
Volume 88 Issue 5 May 2017 Article ID 0079 Research Article
A KUMAR A M VINOD KUMAR ABHIK JASH AJIT K MOHANTY ALEENA CHACKO ALI AJMI AMBAR GHOSAL AMINA KHATUN AMITAVA RAYCHAUDHURI AMOL DIGHE ANIMESH CHATTERJEE ANKIT GAUR ANUSHREE GHOSH ASHOK KUMAR ASMITA REDIJ B SATYANARAYANA B S ACHARYA BRAJESH C CHOUDHARY C RANGANATHAIAH C D RAVIKUMAR CHANDAN GUPTA D INDUMATHI DALJEET KAUR DEBASISH MAJUMDAR DEEPAK SAMUEL DEEPAK TIWARI G RAJASEKARAN GAUTAM GANGOPADHYAY GOBINDA MAJUMDER H B RAVIKUMAR J B SINGH J S SHAHI JAMES LIBBY JYOTSNA SINGH K RAVEENDRABABU K K MEGHNA K R REBIN KAMALESH KAR KOLAHAL BHATTACHARYA LALIT M PANT M SAJJAD ATHAR M V N MURTHY MANZOOR A MALIK MD NAIMUDDIN MOHAMMAD SALIM MONOJIT GHOSH MOON MOON DEVI NABA K MONDAL NAYANA MAJUMDAR NITA SINHA NITALI DASH POMITA GHOSHAL POONAM MEHTA PRAFULLA BEHERA R KANISHKA RAJ GANDHI RAJESH GANAI RASHID HASAN S KRISHNAVENI S M LAKSHMI S K SINGH S S R INBANATHAN S UMA SANKAR SADIQ JAFER SAIKAT BISWAS SANJEEV KUMAR SANJIB KUMAR AGARWALLA SANDHYA CHOUBEY SATYAJIT SAHA SHAKEEL AHMED SHIBA PRASAD BEHERA SRUBABATI GOSWAMI SUBHASIS CHATTOPADHYAY SUDEB BHATTACHARYA SUDESHNA BANERJEE SUDESHNA DASGUPTA SUMANTA PAL SUPRATIK MUKHOPADHYAY SUSHANT RAUT SUVENDU BOSE SWAPNA MAHAPATRA TAPASI GHOSH TARAK THAKORE V K S KASHYAP V S SUBRAHMANYAM VENKTESH SINGH VINAY B CHANDRATRE VIPIN BHATNAGAR VIVEK M DATAR WASEEM BARI Y P VIYOGI
The upcoming 50 kt magnetized iron calorimeter (ICAL) detector at the India-based Neutrino Observatory (INO) is designed to study the atmospheric neutrinos and antineutrinos separately over a wide range of energies andpath lengths. The primary focus of this experiment is to explore the Earth matter effects by observing the energy and zenith angle dependence of the atmospheric neutrinos in the multi-GeV range. This study will be crucial toaddress some of the outstanding issues in neutrino oscillation physics, including the fundamental issue of neutrino mass hierarchy. In this document, we present the physics potential of the detector as obtained from realistic detector simulations.We describe the simulation framework, the neutrino interactions in the detector, and the expected responseof the detector to particles traversing it. The ICAL detector can determine the energy and direction of the muons to a high precision, and in addition, its sensitivity to multi-GeV hadrons increases its physics reach substantially. Itscharge identification capability, and hence its ability to distinguish neutrinos from antineutrinos, makes it an efficient detector for determining the neutrino mass hierarchy. In this report, we outline the analyses carried out for the determination of neutrino mass hierarchy and precision measurements of atmospheric neutrino mixing parameters at ICAL, and give the expected physics reach of the detector with 10 years of runtime. We also explore the potential of ICAL for probing new physics scenarios like CPT violation and the presence of magnetic monopoles.
Volume 97, 2023
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