http://hdl.handle.net/2440/6 2020-02-27T11:50:12Z http://hdl.handle.net/2440/123478 Title: Measurement of KS0 and Λ production in tt¯ dileptonic events in pp collisions at √s= 7 TeV with the ATLAS detector Author: Aad, G.; Abbott, B.; Abbott, D.; Abdinov, O.; Abud, A.; Abeling, K.; Abhayasinghe, D.; Abidi, S.; AbouZeid, O.; Abraham, N.; Abramowicz, H.; Abreu, H.; Abulaiti, Y.; Acharya, B.; Achkar, B.; Adachi, S.; Adam, L.; Bourdarios, C.; Adamczyk, L.; Adamek, L.; et al. Abstract: Measurements of KS0 and Λ0 production in tt¯ final states have been performed. They are based on a data sample with integrated luminosity of 4.6 fb⁻¹ from proton–proton collisions at a centre-of-mass energy of 7 TeV, collected in 2011 with the ATLAS detector at the Large Hadron Collider. Neutral strange particles are separated into three classes, depending on whether they are contained in a jet, with or without a b-tag, or not associated with a selected jet. The aim is to look for differences in their main kinematic distributions. A comparison of data with several Monte Carlo simulations using different hadronisation and fragmentation schemes, colour reconnection models and different tunes for the underlying event has been made. The production of neutral strange particles in tt¯ dileptonic events is found to be well described by current Monte Carlo models for K0S and Λ0 production within jets, but not for those produced outside jets. 2019-01-01T00:00:00Z http://hdl.handle.net/2440/123477 Title: Non-Halal biomarkers identification based on Fourier Transform Infrared Spectroscopy (FTIR) and Gas Chromatography-Time of Flight Mass Spectroscopy (GC-TOF MS) techniques Author: Witjaksono, G.; Saputra, I.; Latief, M.; Jaswir, I.; Akmeliawati, R.; Abdelkreem Saeed Rabih, A. Abstract: Consumption of meat from halal (lawful) sources is essential for Muslims. The identification of non-halal meat is one of the main issues that face consumers in meat markets, especially in non-Islamic countries. Pig is one of the non-halal sources of meat, and hence pig meat and its derivatives are forbidden for Muslims to consume. Although several studies have been conducted to identify the biomarkers for nonhalal meats like pig meat, these studies are still in their infancy stages, and as a result there is no universal biomarker which could be used for clear cut identification. The purpose of this paper is to use Fourier Transform Infrared Spectroscopy (FTIR) and Gas Chromatography-Time of Flight Mass Spectroscopy (GC-TOF MS) techniques to study fat of pig, cow, lamb and chicken to find possible biomarkers for pig fat (lard) identification. FTIR results showed that lard and chicken fat have unique peaks at wavenumbers 1159.6 cm-1, 1743.4 cm-1, 2853.1 cm-1 and 2922.5 cm-1 compared to lamb and beef fats which did not show peaks at these wavenumbers. On the other hand, GC/MS-TOF results showed that the concentration of 1,2,3-trimethyl-Benzene, Indane, and Undecane in lard are 250, 14.5 and 1.28 times higher than their concentrations in chicken fat, respectively, and 91.4, 2.3 and 1.24 times higher than their concentrations in cow fat, respectively. These initial results clearly indicate that there is a possibility to find biomarkers for non-halal identification. 2017-01-01T00:00:00Z http://hdl.handle.net/2440/123476 Title: Measurement of fiducial and differential W⁺W⁻ production cross-sections at √s=13 TeV with the ATLAS detector Author: Aaboud, M.; Aad, G.; Abbott, B.; Abbott, D.; Abdinov, O.; Abud, A.; Abhayasinghe, D.; Abidi, S.; AbouZeid, O.; Abraham, N.; Abramowicz, H.; Abreu, H.; Abulaiti, Y.; Acharya, B.; Achkar, B.; Adachi, S.; Adam, L.; Bourdarios, C.; Adamczyk, L.; Adamek, L.; et al. Abstract: A measurement of fiducial and differential cross-sections for W⁺W⁻ production in proton–proton collisions at s√=13 TeV with the ATLAS experiment at the Large Hadron Collider using data corresponding to an integrated luminosity of 36.1 fb⁻¹ is presented. Events with one electron and one muon are selected, corresponding to the decay of the diboson system as WW→e±νμ∓ν. To suppress top-quark background, events containing jets with a transverse momentum exceeding 35 GeV are not included in the measurement phase space. The fiducial cross-section, six differential distributions and the cross-section as a function of the jet-veto transverse momentum threshold are measured and compared with several theoretical predictions. Constraints on anomalous electroweak gauge boson self-interactions are also presented in the framework of a dimension-six effective field theory. 2019-01-01T00:00:00Z http://hdl.handle.net/2440/123475 Title: Limits on point-like sources of ultra-high-energy neutrinos with the Pierre Auger Observatory Author: Aab, A.; Abreu, P.; Aglietta, M.; Albuquerque, I.; Albury, J.; Allekotte, I.; Almela, A.; Alvarez Castillo, J.; Alvarez-Muniz, J.; Anastasi, G.; Anchordoqui, L.; Andrada, B.; Andringa, S.; Aramo, C.; Asorey, H.; Assis, P.; Avila, G.; Badescu, A.; Bakalova, A.; Balaceanu, A.; et al. Abstract: With the Surface Detector array (SD) of the Pierre Auger Observatory we can detect neutrinos with energy between 10¹⁷ eV and 10²⁰ eV from point-like sources across the sky, from close to the Southern Celestial Pole up to 60º in declination, with peak sensitivities at declinations around ~ −53º and ~+55º, and an unmatched sensitivity for arrival directions in the Northern hemisphere. A search has been performed for highly-inclined air showers induced by neutrinos of all flavours with no candidate events found in data taken between 1 Jan 2004 and 31 Aug 2018. Upper limits on the neutrino flux from point-like steady sources have been derived as a function of source declination. An unrivaled sensitivity is achieved in searches for transient sources with emission lasting over an hour or less, if they occur within the field of view corresponding to the zenith angle range between 60º and 95º where the SD of the Pierre Auger Observatory is most sensitive to neutrinos. 2019-01-01T00:00:00Z