Probir Roy

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Born on 4 October 1942 into a Bengali Kayastha family at Calcutta in the Bengal state of British India to Kiran Lal Roy-Sujata Sikdar couple, Probir Roy graduated in physics with honours from Presidency College under Calcutta University in 1962 before moving to Cambridge University to obtain an MA (Cantab) from King's College, Cambridge in 1965.{{Cite web |url=http://www.theory.tifr.res.in/~probir/cv.pdf |title=Curriculum vitae on TIFR |year=2017 |publisher=Tata Institute of Fundamental Research}} Subsequently, he joined Stanford University for his doctoral studies and secured a PhD, mentored by S. M. Berman, for his thesis in Kaon physics, in 1968.{{Cite web |url=http://insaindia.res.in/detail/N92-1100 |title=Indian fellow |year=2017 |publisher=Indian National Science Academy |access-date=9 May 2017 |archive-date=27 February 2020 |archive-url=https://web.archive.org/web/20200227094517/http://insaindia.res.in/detail/N92-1100 |url-status=dead }} During this period, Roy worked at Stanford Linear Accelerator Center as a research assistant (1966–1968) and as a temporary research associate (1968). He remained in the US for three more years for his post-doctoral work at Cornell University where he worked at the laboratories of Kenneth G. Wilson, who would go on to receive the Nobel Prize in Physics in 1982,{{Cite web |url=https://www.nobelprize.org/nobel_prizes/physics/laureates/1982/ |title=The Nobel Prize in Physics 1982 |year=2017 |publisher=Nobel Foundation}} and Toichiro Kinoshita, an APS fellow,{{Cite web |url=http://history.aip.org/history/acap/biographies/bio.jsp?kinoshitat |title=Toichiro Kinoshita |year=2017 |publisher=Array of Contemporary American Physicists }}{{dead link|date=February 2018 |bot=InternetArchiveBot |fix-attempted=yes }} simultaneously serving the University as an instructor. Before returning to India in 1972, he had a one-year spell at CERN during 1971–72 as a visiting scientist.{{Cite web |url=http://www.theory.tifr.res.in/~probir/ |title=Faculty profile |year=2017 |publisher=Tata Institute of Fundamental Research}}

Roy's career at Tata Institute of Fundamental Research started in 1972 as a visiting fellow and he became a regular research fellow a year later. He served the institution for three decades and half and before his superannuation from TIFR service as a senior professor in 2017, he held various positions as reader (1976–83), associate professor (1983–90) and professor (1990–93). After retiring from regular service, Roy continued his research at Saha Institute of Nuclear Physics as a DAE Raja Ramanna fellow of the Board of Research in Nuclear Sciences (BRNS) until 2012{{cite book|author=Bipul Bhuyan|title=XXI DAE-BRNS High Energy Physics Symposium: Proceedings, Guwahati, India, December 8 – 12, 2014|url=https://books.google.com/books?id=fLNPCwAAQBAJ&pg=PR31|date=30 December 2015|publisher=Springer|isbn=978-3-319-25619-1|pages=31–}} and carries on his research at the Center for Astroparticle Physics and Space Science (CAPSS) of Bose Institute as a senior scientist of the Indian National Science Academy ever since. In between, he had several spells abroad as a visiting faculty and the institutions he has served include Oxford University, University of Texas at Austin, University of California, Riverside, University of Hawaii at Manoa, University of Helsinki and Kavli Institute for Theoretical Physics.

Roy is married to Manashi Bhattacharya and the couple has two children, Jagori and Analabha. The family lives in Salt Lake, a satellite city of Kolkata, West Bengal.{{Cite web |url=http://www.nasi.org.in/fellows.asp?RsFilter=R |title=NASI fellows |year=2017 |publisher=National Academy of Sciences, India |access-date=9 May 2017 |archive-date=15 March 2016 |archive-url=https://web.archive.org/web/20160315130140/http://nasi.org.in/fellows.asp?RsFilter=R |url-status=dead }}

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Roy's work in Kaon physics during his doctoral studies at Stanford University was based on the applications of algebra in the discipline and his thesis was subsequently published by the university under the title, Current-algebra Applications in Kaon Physics.{{cite book|author=Probir Roy|title=Current-algebra Applications in Kaon Physics|url=https://books.google.com/books?id=r_JEAAAAIAAJ|year=1968|publisher=Department of Physics, Stanford University.}} Later, he worked on scale invariance and deep inelastic scattering while at CERN, Geneva and his research thereafter has covered several aspects of high energy physics.{{Cite web |url=http://ssbprize.gov.in/content/Detail.aspx?AID=21 |title=Brief Profile of the Awardee |year=2017 |publisher=Shanti Swarup Bhatnagar Prize |access-date=12 November 2016}} Roy has developed a new sum rule in two-photon processes which is related to the collision of two real polarised photons and the equation is now known as Roy's Sum Rule.{{Cite web |url=http://www.theory.tifr.res.in/~probir/highlights-of-research.pdf |title=Highlights of Research |year=2017 |publisher=Tata Institute of Fundamental Research}} Further, he proposed a solution for U(n)-symmetric Thirring model which has been detailed in two of his articles{{Refn|group=note|co-written with Gautam Bhattacharyya}} published in 1975.{{Cite journal |last=Gautam Bhattacharya, Probir Roy |title=Spinor-inverted solution to Thirring Model and its generaltion to U(n) symmetry |url=https://inspirehep.net/record/1465/?ln=no |journal=Annals of Physics |date=1975 |volume=91 |issue=2 |pages=325–355 |doi=10.1016/0003-4916(75)90224-9|bibcode=1975AnPhy..91..325B |url-access=subscription }}{{Cite journal |last=Gautam Bhattacharya and Probir Roy |title=Exactly solvable two-dimensional U ( n ) gauge-field theory and its consequences |journal=Phys. Rev. D |date=1975 |volume=12 |issue=1721 |pages=1721–1728 |doi=10.1103/PhysRevD.12.1721|bibcode=1975PhRvD..12.1721B }} Later, shifting his focus to supersymmetry and supergravity, he suggested new τ -number violating signals for R-parity breaking and estimated an upper bound on the gaugino-gravitino mass ratio. Deep inelastic lepton-hadron-photon processes with regard to their phenomenological aspects have been another area of his studies.{{cite web | url=http://www.csirhrdg.res.in/ssb.pdf | title=Handbook of Shanti Swarup Bhatnagar Prize Winners | publisher=Council of Scientific and Industrial Research | year=1999 | access-date=9 May 2017 | archive-url=https://web.archive.org/web/20160304043957/http://www.csirhrdg.res.in/ssb.pdf | archive-date=4 March 2016 | url-status=dead }} Roy has also done extensive studies on neutrinos and Higgs mesons which covered the detection of heavy neutrinos, ultralight neutrinos in super-symmetry, oscillations and flavours, and his studies on neutrino detection helped India-based Neutrino Observatory in blueprinting the proposed detector at the observatory.

Roy's studies have been documented by way of a number of articles{{Cite web |url=https://www.researchgate.net/profile/Probir_Roy3 |title=On ResearchGate |year=2017 }}{{Cite web |url=http://www.theory.tifr.res.in/~probir/publications.pdf |title=List of Publications |year=2017 |publisher=Tata Institute of Fundamental Research}}{{Refn|group=note|Please see Selected bibliography section}} and the online article repository of the Indian Academy of Sciences has listed 106 of them.{{Cite web |url=http://repository.ias.ac.in/view/fellows/Roy=3AProbir=3A=3A.html |title=Browse by Fellow |year=2017 |publisher=Indian Academy of Sciences}} Besides, he has published four more books other than his PhD thesis viz. Theory of Lepton-Hadron Processes at High Energies: Partons, Scale Invariance and Light-Cone Physics,{{cite book|author=Probir Roy|title=Theory of Lepton-Hadron Processes at High Energies: Partons, Scale Invariance and Light-Cone Physics|url=https://archive.org/details/theoryofleptonha0000royp|url-access=registration|year=1975|publisher=Clarendon Press|isbn=978-0-19-851452-7}} Supersymmetry and Supergravity Nonperturbative QCD{{cite book|author1=Probir. Roy|author2=Virendra. Singh|title=Supersymmetry and Supergravity Nonperturbative QCD|url=https://books.google.com/books?id=4Uh3NQEACAAJ|year=1984|publisher=Springer|isbn=978-3-540-38942-2}} Phenomenology of the standard model and beyond,{{cite book|author1=Probir Roy|author2=Tata Institute of Fundamental Research|title=Phenomenology of the standard model and beyond: proceedings of the Workshop on High Energy Physics Phenomenology, 2–15 January 1989, TIFR, Bombay, India|url=https://books.google.com/books?id=vceBAAAAIAAJ|date=1 January 1989|publisher=World Scientific|isbn=978-9971-5-0909-5}} and Theory and Phenomenology of Sparticles: An Account of Four-Dimensional N=1 Supersymmetry in High Energy Physics.{{cite book|author1=Manuel Drees|author2=Rohini Godbole|author3=Probir Roy|title=Theory and Phenomenology of Sparticles: An Account of Four-Dimensional N=1 Supersymmetry in High Energy Physics|url=https://books.google.com/books?id=U3jVCgAAQBAJ|date=18 January 2005|publisher=World Scientific|isbn=978-981-4495-34-9}} Roy has also contributed chapters to books published by others{{cite book|author1=Hans Volker Klapdor-Kleingrothaus|author2=I. V. Krivosheina|author3=R. Viollier|title=Physics Beyond the Standard Models of Particles, Cosmology and Astrophysics: Proceedings of the Fifth International Conference, Beyond 2010 : Cape Town, South Africa, 1–6 February 2010|url=https://books.google.com/books?id=zaH15vMz2gMC&pg=PA293|year=2011|publisher=World Scientific|isbn=978-981-4340-85-4|pages=293–}}{{cite book|author=Christopher G. Tully|title=Elementary Particle Physics in a Nutshell|url=https://books.google.com/books?id=ZBA2UgZ-MtIC&pg=PA123|date=10 October 2011|publisher=Princeton University Press|isbn=978-1-4008-3935-3|pages=123–}} and has mentored doctoral and post-doctoral scholars. The lecture series or invited talks delivered by him included Linear collider signals of anomaly-mediated supersymmetry breaking, at the physics working group meeting of American Linear Collider Physics in 2004,{{Cite web |url=http://www.theory.tifr.res.in/~probir/AMSBnew.pdf |title=Linear collider signals of anomaly-mediated supersymmetry breaking |year=2017 |publisher=Tata Institute of Fundamental Research}} The wonderful world of neutrinos at S.N. Bose National Centre for Basic Sciences in 2004,{{Cite web |url=http://www.theory.tifr.res.in/~probir/PRTalk.pdf |title=The wonderful world of neutrinos |year=2017 |publisher=Tata Institute of Fundamental Research}} Measuring the deviation from maximal mixing of atmospheric neutrinos at INO, at PANIC 05 in Santa Fe, New Mexico,{{Cite web |url=http://www.theory.tifr.res.in/~probir/talk_panic_05.pdf |title=Measuring the deviation from maximal mixing of atomospheric neutrinos at INO |year=2017 |publisher=Tata Institute of Fundamental Research}} Event-shape of dileptons plus missing energy at a linear collider as a SUSY/ADD discriminant at Indian Institute of Science in 2006,{{Cite web |url=http://www.theory.tifr.res.in/~probir/lcws_talk.pdf |title=Event-shape of dileptons plus missing energy at a linear collider as a SUSY/ADD discriminant |year=2017 |publisher=Tata Institute of Fundamental Research}} Symmetries of nonhierarchical neutrinos from high to low scales at IWTHEP-2007,{{Cite web |url=http://www.theory.tifr.res.in/~probir/neutrino.pdf |title=Symmetries of nonhierarchical neutrinos from high to low scales |year=2017 |publisher=Tata Institute of Fundamental Research}} and Dark Energy of the Universe at Indian Institute of Science Education and Research, Pune in 2015.{{Cite web |url=http://www.iiserpune.ac.in/events/Dark+Energy+of+the+Universe%3A+Science+Club+Lecture+Series+talk+by+Prof.+Probir+Roy |title=Dark Energy of the Universe |year=2017 |publisher=IISER Pune}}

Roy is one among the Indian participants in the Oxford-India Network in Theoretical Physical Sciences, an initiative promoted by the John Fell Fund.{{Cite web |url=http://www-thphys.physics.ox.ac.uk/people/SubirSarkar/fellfund.html |title=Oxford-India Network in Theoretical Physical Sciences |year=2017 |publisher=Oxford University}} He was a member of the research committee of the Council of Scientific and Industrial Research during 1991–94. Roy served as the chairman of the Physics Graduate School from 1992 to 1997 and the Department of Theoretical Physics from 1997 to 2002, both based at Tata Institute of Fundamental Research. He sat in the governing council of S.N. Bose National Centre for Basic Sciences from 1997 to 2002 and in the editorial boards of Indian Journal of Pure and Applied Physics, Pramana and Indian Journal of Physics during various terms. He also served as the vice-president of the Indian Physical Society in 1996 and presided the society in 2002.

During his college days at King's College, Cambridge, Roy received three honours from the institution; Powel Prize for the best student in natural sciences (1964), senior scholarship (1964) and honorary scholarship (1965). The Council of Scientific and Industrial Research awarded him the Shanti Swarup Bhatnagar Prize, one of the highest Indian science awards in 1987.{{Cite web |url=http://www.csir.res.in/careeraward/prize-winner-indexdiscipline-wise |title=CSIR list of Awardees |year=2017 |publisher=Council of Scientific and Industrial Research}} The Indian Academy of Sciences elected him as a fellow in 1989{{Cite web |url=http://www.ias.ac.in/describe/fellow/Roy,_Prof._Probir |title=Fellow profile |year=2017 |publisher=Indian Academy of Sciences}} and he became a fellow of the Indian National Science Academy in 1992.{{Cite web |url=http://www.insaindia.res.in/pdf/YearBook_2016.pdf |title=INSA Year Book 2016 |year=2017 |publisher=Indian National Science Academy |access-date=9 May 2017 |archive-url=https://web.archive.org/web/20161104001952/http://www.insaindia.res.in/pdf/YearBook_2016.pdf |archive-date=4 November 2016 |url-status=dead }} Two years later, INSA selected him for the exchange fellowship between the academy of the Royal Society and the American Physical Society elected him as a fellow in 1995. He delivered the Meghnad Saha award oration of the Indian Association for the Cultivation of Science in 1997 and received the elected fellowship of the National Academy of Sciences, India in 2001.{{Cite web |url=http://www.nasi.org.in/Year%20Book%202015.pdf |title=NASI Year Book 2015 |year=2017 |publisher=National Academy of Sciences, India |access-date=9 May 2017 |archive-date=6 August 2015 |archive-url=https://web.archive.org/web/20150806211716/http://www.nasi.org.in/Year%20Book%202015.pdf |url-status=dead }}

• {{cite book|author=Probir Roy|title=Current-algebra Applications in Kaon Physics|url=https://books.google.com/books?id=r_JEAAAAIAAJ|year=1968|publisher=Department of Physics, Stanford University.}}
• {{cite book|author=Probir Roy|title=Theory of Lepton-Hadron Processes at High Energies: Partons, Scale Invariance and Light-Cone Physics|url=https://archive.org/details/theoryofleptonha0000royp|url-access=registration|year=1975|publisher=Clarendon Press|isbn=978-0-19-851452-7}}
• {{cite book|author1=Probir. Roy|author2=Virendra. Singh|title=Supersymmetry and Supergravity Nonperturbative QCD|url=https://books.google.com/books?id=4Uh3NQEACAAJ|year=1984|publisher=Springer|isbn=978-3-540-38942-2}}
• {{cite book|author1=Probir Roy|author2=Tata Institute of Fundamental Research|title=Phenomenology of the standard model and beyond: proceedings of the Workshop on High Energy Physics Phenomenology, 2–15 January 1989, TIFR, Bombay, India|url=https://books.google.com/books?id=vceBAAAAIAAJ|date=1 January 1989|publisher=World Scientific|isbn=978-9971-5-0909-5}}
• {{cite book|author1=Manuel Drees|author2=Rohini Godbole|author3=Probir Roy|title=Theory and Phenomenology of Sparticles: An Account of Four-Dimensional N=1 Supersymmetry in High Energy Physics|url=https://books.google.com/books?id=U3jVCgAAQBAJ|date=18 January 2005|publisher=World Scientific|isbn=978-981-4495-34-9}}

• {{cite book|author1=Hans Volker Klapdor-Kleingrothaus|author2=I. V. Krivosheina|author3=R. Viollier|title=Physics Beyond the Standard Models of Particles, Cosmology and Astrophysics: Proceedings of the Fifth International Conference, Beyond 2010 : Cape Town, South Africa, 1–6 February 2010|url=https://books.google.com/books?id=zaH15vMz2gMC&pg=PA293|year=2011|publisher=World Scientific|isbn=978-981-4340-85-4|pages=293–}}
• {{cite book|author=Christopher G. Tully|title=Elementary Particle Physics in a Nutshell|url=https://books.google.com/books?id=ZBA2UgZ-MtIC&pg=PA123|date=10 October 2011|publisher=Princeton University Press|isbn=978-1-4008-3935-3|pages=123–}}

• {{Cite journal |last=Gautam Bhattacharya, Probir Roy |title=Spinor-inverted solution to Thirring Model and its generaltion to U(n) symmetry |journal=Annals of Physics |date=1975 |volume=91 |issue=2 |pages=325–355 |doi=10.1016/0003-4916(75)90224-9|bibcode=1975AnPhy..91..325B }}
• {{Cite journal |last=Gautam Bhattacharya and Probir Roy |title=Exactly solvable two-dimensional U ( n ) gauge-field theory and its consequences |journal=Phys. Rev. D |date=1975 |volume=12 |issue=1721 |pages=1721–1728 |doi=10.1103/PhysRevD.12.1721|bibcode=1975PhRvD..12.1721B }}
• {{Cite journal |last=Ernest Ma, Probir Roy |title=Identifying τ as a nonleptonic superparticle |journal=Physical Review D |date=1990 |volume=41 |issue=3–1 |pages=988–991 |doi=10.1103/PhysRevD.41.988|pmid=10012426 |bibcode=1990PhRvD..41..988M }}
• {{Cite journal |last=Probir Roy |title=Radiative electroweak parameters |journal=Pramana - Journal of Physics |date=1993 |volume=41 |issue=Suppl |pages=75–82 |doi=10.1007/BF02908077|arxiv=hep-ph/9303325 |bibcode=1993Prama..41S..75R |s2cid=18365464 }}
• {{Cite journal |last=Partha Konar, Probir Roy |title=Event shape discrimination of supersymmetry from large extra dimensions at a linear collider |journal=Physics Letters B |date=2006 |volume=634 |issue=2–3 |pages=295–301 |doi=10.1016/j.physletb.2006.01.056|arxiv=hep-ph/0509161 |bibcode=2006PhLB..634..295K |s2cid=13912698 }}

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• {{Cite web |url=http://www.th.physik.uni-bonn.de/Groups/drees/book.html |title=Theory and Phenomenology of Sparticles |last=Manuel Drees, Rohini Godbole, Probir Roy |year=2017 |work=Official webpage|publisher=Physics Institute of Bonn University }}
• {{Cite web |url=https://inspirehep.net/record/359463?ln=en |title=Electroweak processes and precision tests |last=Probir Roy |date=January 1993 |work=Lecture given at Puri Winter School in Physics: Particle Physics and Cosmology at the Interface (BCSPIN)|publisher=Inspire HEP }}

• {{Cite web |url=http://ift.uni.wroc.pl/~karp52/POSTERS/R_Samanta.pdf |title=Residual Symmetry and Scaling Ansatz in Neutrino Mass Matrix: Maximal CP violation |last=Rome Samanta, Probir Roy, Ambar Ghosal |year=2017 |publisher=University of Wrocław |page=Article (full text) |access-date=9 May 2017 |archive-date=9 March 2018 |archive-url=https://web.archive.org/web/20180309054148/http://ift.uni.wroc.pl/~karp52/POSTERS/R_Samanta.pdf |url-status=dead }}

{{SSBPST recipients in Physical Science}}

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Category:1942 births

Category:Indian particle physicists

Category:Scientists from Kolkata

Category:Bengali physicists

Category:Presidency University, Kolkata alumni

Category:Alumni of King's College London

Category:Alumni of King's College, Cambridge

Category:Stanford University alumni

Category:Cornell University alumni

Category:Academic staff of Tata Institute of Fundamental Research

Category:University of Texas at Austin faculty

Category:University of California, Riverside people

Category:University of Hawaiʻi faculty

Category:Academic staff of the University of Helsinki

Category:Recipients of the Shanti Swarup Bhatnagar Award in Physical Science

Category:Fellows of the Indian Academy of Sciences

Category:Fellows of the Indian National Science Academy

Category:Fellows of the National Academy of Sciences, India

Category:Fellows of the American Physical Society

Category:Living people

Category:People associated with CERN