Yazar "Dag, Huseyin" seçeneğine göre listele

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    Klein-Nishina cross-sections and radiation interaction coefficients of human organs and dosimetric materials for diagnostic and radiation dosimetry applications
    (Springer Heidelberg, 2025) Levet, Aytac; Dag, Huseyin; Al-Buriahi, Mohammed Sultan; Buyukyildiz, Mehmet
    X-ray and gamma-ray have been frequently used worldwide for different aims such as scans, diagnostic, and therapeutic applications. While these processes occur for the aims, people unintentionally receive various doses of these rays which are highly energetic. Thus, electronic and energy transfer cross-sections, Compton mass attenuation coefficients, Compton mass energy transfer coefficients (CMETC) according to effective charges and charge to atomic weight ratios should be investigated for our health especially organs or dosimetric materials. In the present study, these parameters have been studied using Klein-Nishina approach in the wide energy region. The cross-sections have been firstly calculated in the photon energies. The investigated parameters of the materials have been then determined using the relevant cross-sections and effective atomic numbers in the same energy range. The results were compared with each other and some possible results from the literature. A good agreement was observed for electronic and energy transfer cross-sections (Diff. <= 0.16%). In addition, a comparison with the literature was conducted for possible materials at certain photon energies, and maximum difference (%) in soft tissue was observed up to around 33.61% for CMETCs. The reported data should be useful using the gamma rays in medicine and dosimetry applications.
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    Resolving the W boson mass in the lepton specific two Higgs doublet model
    (Iop Publishing Ltd, 2026) Cici, Ali; Dag, Huseyin
    In 2022, the collider detector at Fermilab (CDF) collaboration reported the W-boson mass (M-W = 80.4335 +/- 0.0094 GeV), which deviates from the standard model (SM) prediction (M-W(SM) = 80.357 +/- 0.006 GeV) by similar to 7 sigma. In contrast, the CMS collaboration obtained M-W = 80.3602 +/- 0.0099 GeV, which was very close to the SM global electroweak fit value of similar to 80.357 GeV. Motivated by this situation, we reassess the W-boson mass within the lepton-specific two Higgs doublet model (LS-2HDM). To this end, we perform random scans (generated with SARAH 4.13.0 and evaluated with SPheno 4.0.3) and confront the results with up-to-date theoretical and experimental constraints. The scan enforces vacuum stability, perturbative unitarity, and perturbativity; electroweak precision observables via the oblique parameters (S,T,U); LEP bounds on H-+/-; rare B-meson decays; lepton flavor universality (LFU) in Z and tau decays; and 13 TeV LHC searches for additional Higgs bosons. Viable points are further tested with HiggsTools (HiggsSignals + HiggsBounds). In the LS-2HDM, if h(1) is the SM-like Higgs at m(h1) similar or equal to 125 |cos((beta-alpha))|less than or similar to 0.06, 17 less than or similar to tan beta less than or similar to 39, 144 less than or similar to m(h2) less than or similar to 414 GeV, and 435 less than or similar to m(A,H) +/- less than or similar to 685 GeV, the model reproduces the 2024 CMS W-boson mass within 3 sigma. Solutions near the 2022 CDF value (M-W = 80.4335 +/- 0.0094 GeV) survive; however, after applying all constraints, including HiggsTools, they approach it at best within less than or similar to 2 sigma. Our findings emphasize that LS-2HDM favors the CMS results consistently with the current experimental results. Although one can theoretically accommodate the CDF results in this model, up-to-date electroweak precision bounds on oblique parameters (S,T,U) with the SM-like Higgs and LFU constraints exclude these solutions. Our results for W-boson mass can only be as close as about 2 sigma to the CDF results.