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Lhcb and Physics Beyond the Standard Model-Some Aspects

Thesis Info

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Author

Hussain, Mureed

Program

PhD

Institute

National University of Sciences & Technology

City

Islamabad

Province

Islamabad

Country

Pakistan

Thesis Completing Year

2019

Thesis Completion Status

Completed

Subject

Physics

Language

English

Link

http://prr.hec.gov.pk/jspui/bitstream/123456789/12015/1/Mureed%20Hussain%20Physics%202019%20nust%20isb%20prr.pdf

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676726582442

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The Standard Model of particle physics is a very well tested theory today. There are some theoretical as well as experimental deficiencies in the Standard Model which hint for theories beyond the Standard Model. Any such theory may be tested by direct observation of some new particles, predicted by the theory, at High Energy Colliders, like the Large Hadron Collider(LHC). Since there has been no such particle detected till today, we need to study these new theories under the phenomenological aspects of our known experimental results. Such studies result in constraining the free parameter space of these models. In this thesis, we use experimental results from three different experiments at the LHC, namely the ATLAS experiment, the CMS experiment and the LHC-b experiment to constrain the parameter spaces of some of these models. The models discussed in this thesis are basically constructed by making minimal extensions in scalar and gauge structures of the Standard Model. We apply constraints on these models from the flavor physics observables which are mainly coming from the rare decays of B-mesons and are measured by the particle physics experiment, LHC-beauty (LHCb). In our study we also discuss some supersymmetric extensions of the Standard Model in light of the latest results on masses of particles and their superpartners (sparticles) provided by the ATLAS and the CMS experiments. It is also seen that the supersymmetric extensions of the Standard Model can provide a suitable dark matter candidate, the neutralino, with several coannihilation scenarios while having compatibilitywithallrecentexperimentalconstraintsfrom B-physicsandthesparticles mass bounds. Direct and indirect dark matter searches by XENON1t and Fermi-LAT collaborations are also incorporated to the studies of these models by measuring the dark matter relic density as well as spin-dependent and spin-independent cross sections forsomesampledatapoints. Compatibility ofsolutionswith Yukawa unifiedtheoriesis alsosearchedforthegaugesymmetrybasedsupersymmetricextensionsoftheStandard Model. We have also searched how the anomaly associated with the magnetic moment of muon can be solved within the context of the supersymmetric extensions of the Standard Model, in addition to all other constraints.
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دھڑکنوں سے پیام آیا ہے

دھڑکنوں سے پیام آیا ہے
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کوئی کیوں تیرے ساتھ ساتھ چلے
میں ہی ہوں اور میرا سایا ہے

اُس کی مسکان پر ہیں پھول فدا
چاند پر حسن اس کا چھایا ہے

کوئے جاناں میں بکتے یوسف کو
کوئی کیوں کر خرید لایا ہے

آج دھڑکن بھی تیز ہے دل کی
آج اُن کا سلام آیا ہے

میں بصد شوق منتظر تھی فضاؔ
دل یہ کس کا پیام لایا ہے

پاکستان میں جبری شادیوں كے اسباب و محرکات

Before the advent of Islam, a woman was considered as property, with no rights at all. They did not have the right to choose a husband. Islam liberated women and gave them the basic rights. Unfortunately, in Pakistan many parents and legal guardians misinterpret and misuse the guardianship of their children, especially with reference to marriage. They deny some religious rights to their children because of local traditions, customs and taboos. Forcing children to marry against their wishes, does not conform to the Islamic code. Forced marriages are considered illegle in Shariah. Even in the case of marriage of a minor arranged, by a father or a grandfather, the girl has the right to cancal it on reaching Puberty. According to Shariah the boy and the girls has the right to turn to a court for a settlement of the issue.

Screening of Commonly Used Feed Ingredients for Digestible Amino Acids, Metabolizable Energy and Their Effects on Three Different Broiler Strains

The present study was planned to examine digestible amino acids (DAA) and apparent metabolizable energy corrected for nitrogen (AMEn) of the commonly used indigenous poultry feed resources, and their effects on the performance of Cobb (500), Arbor Acre and Hubbard (Classic). The study comprised of three phases. In the first phase, standardized ileal amino acid digestibility (SIAAD) of 3 samples of each feed ingredient was determined in broilers at the age of 21 days. The test ingredients served as sole source of AAs in their respective diets. The diet based on each sample of each ingredient was fed to 36 birds in 6 replicates, each containing 6 birds. The acid insoluble ash (AIA), at the rate of 2% of the diet, was used as an external marker to determine digestibility. Among cereals, the corn had the highest SIAAD (90.11%) and among cereal by-products, wheat bran exhibited higher SIAAD (76.86%). Among protein meals, soybean had the highest digestibility but it was the lowest in guar meal. In the second phase, the AMEn of 3 sample of each feed ingredient was determined by substitution method in 21 days old broilers using AIA, at 1% of the diet, as an external marker. Among cereals, rice broken had the highest AMEn (3372 kcal/kg). Similar in cereal byproducts, rice polishings supplied the highest AMEn (1936 kcal/kg). The fish meal exhibited highest AMEn (2802 kcal/kg) in protein meals. In the third phase, 3 diets for each strain were formulated using DAA coefficients and AMEn values determined in first two phases to examine the growth performance of three broiler strains. The control diet (C) had standard DAA according to each strain’s requirement. The second diet (HDAA) supplied 10% more DAA and the third diet (LDAA) had 10% less DAA than C. Data were analyzed using Completely Randomized Design (CRD) having levels of DAAs nested within broiler strains. The growth performance of Arbor Acre at 42 days of age was better (P<0.05) followed by Hubbard and Cobb. All 3 strains of broilers fed LDAA diet ate more (P>0.05) feed and gained numerically more (P>0.05). Similarly, improved feed conversion ratio (P>0.05) was noticed in Cobb fed HDAA diet. However, Arbor Acre and Hubbard performed better on C diet. Dressing percentage remained similar among all diets in all strains; but, breast meat percentage improved (P>0.05) when fed HDAA diet in all strains. In conclusion, determining nutrient availability of locally available feed ingredients will not only help maintain national database repository but will also help cost-effective broiler production in the country.