Neha Shah

Personal Information

Neha Shah
Research Scholar
Department of Physics,
Indian Institute of Technology Bombay,
Powai, Mumbai- 400076
Mobile: +91-9819684639

The MS University of Baroda (2002)
The MS University of Baroda (2004)

Research Experience

I joined I.I.T. Bombay in July 2005. The first one year was devoted to course work and various laboratory classes. After successful completion of the course work, I joined the Experimental High Energy Physics group under the guidance of Prof Raghava Varma, who is associated with ALICE-PMD collaboration, STAR-PMD collaboration and WASA-at-COSY collaboration.

I am working on my doctoral thesis with WASA-at-COSY collaboration. Nineteen institutes from seven countries are participating in this experiment. The Wide Angle Shower Apparatus (WASA) is installed at COoler SYnchrotron (COSY) in Germany. The main aim of the WASA detector is to study various decay modes of the &eta-meson. The COSY provides accelerated beam of protons and deuterons in the momentum range 0.3 GeV/c to 3.7 GeV/c. WASA is a fixed target experiment. We have pellet target system which provides the target of hydrogen or deuterium of thickness of few μm. The WASA detector consists of two parts: the forward part and the central part. The forward part, having eleven planes of scintillation detectors, is designed to measure scattered particles. The central part, consisting of tracking chamber and calorimeter, is designed to measure decay products of the η-meson, like π±, e± and photon.

The production mechanism of &eta-meson in proton-proton interaction and three body ppη dynamics are not well understood near threshold. I am therefore investigating pp&eta dynamics at beam energy Tlab = 1.4 GeV (56 MeV above threshold) and measuring the total cross-section for production of η-meson. For selection of events, η→3π0 channel with branching ratio (32.51±0.29) % is chosen. The major background contribution is from pp→pp3π0 (σ = 1.09 μb) and pp→pp2π0 (σ = 250 μb). Because of split off in the detector, pp→pp2π0 contributes as a background. After applying various selection criterion (arrived at by extensive simulations) on the data, the contribution from pp→pp2π0 is negligible but the other background contributions cannot be neglected. We have used kinematic fitting to improve the invariant mass resolution of η in η→3π0 channel from 61 MeV to 5 MeV and to improve the signal to background ratio. Preliminary result for production cross-section is σ = (9.27±0.04stat±3.21sys) μb. The differential cross-section for ppη are studied. The distributions shows deviation from the phase space and they can be described by taking contributions from higher partial waves.

For any experiment luminosity measurement is very important. My thesis work also involves the measurement of luminosity for the WASA-at-COSY collaboration. Proton-proton elastic scattering has been chosen for this measurement. The elastic scattering events can be tagged by ensuring physical constraint on the planarity of the two scattered protons. We have selected the events coming in three sigma of the planarity distribution by fitting the signal with Gaussian and background as polynomial of order two. The signal to background ratio is 10.32 %. The elastic scattering cross-section at beam energy Tlab = 1.4 GeV is (21.52 ±0.07) mb. Total 89 hours of data taken in April 2007 is analyzed and the time integrated luminosity is (3445 ± 56stat±794sys) nb-1.


Measurement of the 3pi0 Dalitz Plot Distribution with the WASA Detector at COSY, Phys. Lett. B 677, 24-29, 2009.

Participation in Conferences

1. “Experimental study of ppeta dynamics with WASA-at-COSY” at International conference on Meson-Nucleon Physics and structure of the nucleon held at College of Williams and Marry, USA during May 31 - June 4, 2010.

2. “Experimental study of ppeta dynamics with WASA-at-COSY” at International Symposium on Nuclear Physics held at BARC, Mumbai during December 8-12, 2009.

3. “Measurement of luminosity using p-p elastic scattering at Tlab = 1400 MeV with WASA-at-COSY” at International symposium on Nuclear Physics held at BARC, Mumbai during December 8-12, 2009.

4. “Study of production mechanism of eta-meson in proton-proton collision and measurement of luminosity using proton-proton elastic scattering at Tlab = 1400 MeV with WASA-at-COSY” at DAE-BRNS symposium on Nuclear Physics held at I.I.T. Roorkee, Uttarakhand during December 22-26, 2008.

5. “Physics with WASA-at-COSY” at Quark Matter held in Jaipur during February 4-10, 2008.

6. “Physics with WASA-at-COSY” at DAE-BRNS symposium on Nuclear Physics held at Sambalpur University, Orissa during December 11-15, 2007.

Conference/School/Orientation/Workshop program

1. DAE-BRNS workshop on “Hadron Physics” held at Aligarh Muslim University, Aligarh during February 18-23, 2008.

2. 11th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon held at Institute of Kern Physik, Germany during September 10- 14, 2007.

3. Advanced school on Quark Gluon Plasma held at Indian Institute of Technology Bombay, Mumbai during July 3-13, 2007.

4. III-SERC School on Quark Gluon Plasma and Hadron Physics held at Institute of Physics, Orissa during December 21, 2006 to January 9, 2007.

5. Workshop on Supercomputing Relativistic Heavy-Ion Collision Physics held at Tata Institute of Fundamental Research, Mumbai during December 5-9, 2005.

6. V-SERC School on Experimental High energy physics held at Punjab University, Chandigarh during March 7-28, 2005.

7. A 15 days’ Orientation program entitled “Study of Beam Pulsing system used for The Pelletron Accelerator” at Nuclear Science Center, New Delhi during October 20 to November 3, 2003.

Teaching Experience

1. Worked as a teaching assistant in Nuclear Physics laboratory for M.Sc. and third year B.Tech. students of I.I.T. Bombay during academic year 2006 & spring semester 2008, where I worked with NaI(Tl) detectors, PMT’s, G. M. Counter and various NIM/CAMAC modules.

2. Worked as a teaching assistant in general physics laboratory for first year B.Tech. students of all disciplines in I.I.T. Bombay during autumn semester in 2007 & 2008.

3. Have also been involved in setting up and demonstrating Nuclear Physics experiments to the Ph.D. students in the country at a graduate school on experimental particle physics.

research-scholars/nehashah.txt · Last modified: 2010/08/14 00:18 by nehashah
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