Browsing by Author "Sevgi Karadaǧ"

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Constraints on new physics with light mediators and generalized neutrino interactions via coherent elastic neutrino nucleus scattering
(American Physical Society, 2025) Sevgi Karadaǧ; Muhammed Deniz; S. Karmakar; Major Kumar Singh; Mehmet Demirci; C. Greeshma; Haubin Li; Shinted Lin; M. F. Mustamin; Vivek Sharma; Lakhwinder Singh; M. K. Singh; Venktesh Singh; Henry Tsz King Wong
Weinvestigate new physics effects on coherent elastic neutrino nucleus scattering within the framework of nonstandard interactions and generalized neutrino interactions. Additionally, we examine the possibility of light mediators from a simplified model that includes all possible Lorentz-invariant interactions of vector, axialvector, scalar, pseudoscalar, and tensor types. Constraints and allowed regions at the 90% CL for masses and couplings in each new physics scenario have been obtained through the analysis of TEXONOdata,whichincludes two datasets from a high-purity n-type point contact germanium detector in 2016 and an advanced p-type point contact Ge detector in 2025. The results are presented in comparison with other reactor and accelerator-based neutrino experiments for complementarity. © (2025), (Web Portal American Physical Society). All Rights Reserved.
Dark matter annual modulation analysis with combined nuclear and electron recoil channels
(American Physical Society, 2025) Haubin Li; Mukesh Kumar Pandey; C. H. Leung; Lakhwinder Singh; Henry Tsz King Wong; Hsinchang Chi; Muhammed Deniz; C. Greeshma; Jiunn Wei Chen; H. C. Hsu; Sevgi Karadaǧ; S. Karmakar; V. Kumar; Jin Li; Fong Kay Lin; Shinted Lin; Chengpang Liu; Shukui Liu; Hao Ma; Devendra Kumar Mishra; Kapil Saraswat; Vivek Sharma; Manoj Kumar Singh; Venktesh Singh; D. Tanabe; Jiashian Wang; Chihpan Wu; Litao Yang; C. H. Yeh; Qian Yue
After decades of experimental efforts, the DAMA/LIBRA(DL) annual modulation (AM) analysis on the χN (WIMP dark matter interactions on nucleus) channel remains the only one which can be interpreted as positive signatures. This has been refuted by numerous time-integrated (TI) and AM analysis. It has been shown that χe (WIMP interactions with electrons) alone is not compatible with the DL AM data. We expand the investigations by performing an AM analysis with the addition of χe long-range and short-range interactions to χN, derived using the frozen core approximation method. Two scenarios are considered, where the χN and χe processes are due to a single χ (Γtot1χ) or two different χ's (Γtot2χ). The combined fits with χN and χe provide stronger significance to the DL AM data which are compatible with the presence of additional physical effects beyond χN alone. This is the first analysis which explores how χe AM can play a role in DL AM. The revised allowed regions as well as the exclusion contours from the other null AM experiments are presented. All DL AM allowed parameter spaces in χN and χe channels under both Γtot1χ and Γtot2χ are excluded at the 90% confidence level by the combined null AM results. It can be projected that DL-allowed parameter spaces from generic models with interactions induced by two-WIMPs are ruled out. © 2025 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.