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Mass measurement using an intensity-modulated optical fiber sensor
, Article Optics and Lasers in Engineering ; Volume 38, Issue 6 , 2002 , Pages 537-548 ; 01438166 (ISSN) ; Sharif University of Technology
2002
Abstract
Design and operation of an opto-mechanical sensor for mass measurements is reported. This device uses a pair of optical fibers and a reflecting coated lens. The light intensity modulation is based on the relative motion of the lens due to a given mass with respect to the optical fibers. The modulated intensity because of the weighing mass has been measured by using a digital voltmeter. A full-range sensitivity of about 11.5 mV/g for a dynamic range of 80 g is obtained. A mass resolution of better than 0.25 g has been measured with this device. The measured output response is checked against the expected theoretical one and a general agreement observed. A comparison with similar experimental...
Top Quark Mass Measurement Via Leptonic Observables in the CMS Experiment using 13 TeV PP Collision Data at the LHC
, M.Sc. Thesis Sharif University of Technology ; Torabian, Mahdi (Supervisor) ; Zeinali, Maryam (Co-Supervisor)
Abstract
The top quark is the heaviest of elementary particles. It gives the dominant contribution to the radiative correction to the Higgs self coupling constant which itself determines the structure of the electroweak vacuum. Therefore, it is extremely important to have a precise measurement of the top quark mass. On the other hand, whereas the lifetime of top quark is short and rapidly decays to lighter particles, it is not easy to compute and measure its mass with a desired precision. In this work, we propose a measurement method to determine the top quark mass in the t▁t→leptons +jets channel by analyzing the decay of the b-hadron in the top quark decay chain. Through the reconstruction of the...
Precision measurement of a brown dwarf mass in a binary system in the microlensing event: OGLE-2019-BLG-0033/MOA-2019-BLG-035
, Article Astronomy and Astrophysics ; Volume 663 , 2022 ; 00046361 (ISSN) ; Udalski, A ; Bozza, V ; Rota, P ; Bond, I. A ; Yee, J. C ; Sajadian, S ; Mróz, P ; Poleski, R ; Skowron, J ; Szymanski, M. K ; Soszynski, I ; Pietrukowicz, P ; Kozlowski, S ; Ulaczyk, K ; Rybicki, K. A ; Iwanek, P ; Wrona, M ; Gromadzki, M ; Abe, F ; Barry, R ; Bennett, D. P ; Bhattacharya, A ; Fukui, A ; Fujii, H ; Hirao, Y ; Itow, Y ; Kirikawa, R ; Kondo, I ; Koshimoto, N ; Matsubara, Y ; Matsumoto, S ; Miyazaki, S ; Muraki, Y ; Olmschenk, G ; Ranc, C ; Okamura, A ; Rattenbury, N. J ; Satoh, Y ; Sumi, T ; Suzuki, D ; Silva, S. I ; Toda, T ; Tristram, P. J ; Vandorou, A ; Yama, H ; Beichman, C. A ; Bryden, G ; Novati, S. C ; Carey, S ; Gaudi, B. S ; Gould, A ; Henderson, C. B ; Johnson, S ; Shvartzvald, Y ; Zhu, W ; Dominik, M ; Hundertmark, M ; Jørgensen, U. G ; Longa-Peña, P ; Skottfelt, J ; Tregloan-Reed, J ; Bach-Møller, N ; Burgdorf, M ; D'Ago, G ; Haikala, L ; Hitchcock, J ; Khalouei, E ; Peixinho, N ; Rahvar, S ; Snodgrass, C ; Southworth, J ; Spyratos, P ; Zang, W ; Yang, H ; Mao, S ; Bachelet, E ; Maoz, D ; Street, R. A ; Tsapras, Y ; Christie, G. W ; Cooper, T ; De Almeida, L ; Do Nascimento, J.-D ; Green, J ; Han, C ; Hennerley, S ; Marmont, A ; McCormick, J ; Monard, L. A. G ; Natusch, T ; Pogge, R ; Sharif University of Technology
EDP Sciences
2022
Abstract
Context. Brown dwarfs are transition objects between stars and planets that are still poorly understood, for which several competing mechanisms have been proposed to describe their formation. Mass measurements are generally difficult to carry out for isolated objects as well as for brown dwarfs orbiting low-mass stars, which are often too faint for a spectroscopic follow-up. Aims. Microlensing provides an alternative tool for the discovery and investigation of such faint systems. Here, we present an analysis of the microlensing event OGLE-2019-BLG-0033/MOA-2019-BLG-035, which is caused by a binary system composed of a brown dwarf orbiting a red dwarf. Methods. Thanks to extensive ground...