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Journal articleHayrapetyan A, Tumasyan A, Adam W, et al., 2025,
Measurement of the double-differential inclusive jet cross section in proton-proton collisions at √<i>s</i>=5<i>.</i>02 TeV
, JOURNAL OF HIGH ENERGY PHYSICS- Cite
- Citations: 2
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Journal articleZunica G, Zuliani D, Zou Q, et al., 2025,
Long-lived particle reconstruction downstream of the LHCb magnet
, European Physical Journal C, Vol: 85, ISSN: 1434-6044Charged-particle trajectories are usually reconstructed with the LHCb detector using combined information from the tracking devices placed upstream and downstream of the 4 T m dipole magnet. Trajectories reconstructed using only information from the tracker downstream of the dipole magnet, which are referred to as T tracks, have not been used for physics analysis to date. The challenges of the reconstruction of long-lived particles with T tracks for physics use are discussed and solutions are proposed. The feasibility and the tracking performance are studied using samples of long-lived Λ and KS0 hadrons decaying between 6.0 and 7.6 m downstream of the proton–proton collision point, thereby traversing most of the magnetic field region and providing maximal sensitivity to magnetic and electric dipole moments. The reconstruction can be expanded upstream to about 2.5 m for use in direct searches of exotic long-lived particles. The data used in this analysis have been recorded between 2015 and 2018 and correspond to an integrated luminosity of 6 fb-1. The results obtained demonstrate the possibility to further extend the decay volume and the physics reach of the LHCb experiment.
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Journal articleKarikar A, Das K, Das I, 2025,
Magnetoresistive and magnetocaloric properties of polycrystalline Sm0.50Sr0.50MnO3 compound with short range magnetic ordering
, Journal of Materials Science Materials in Electronics, Vol: 36, ISSN: 0957-4522In this study, the magnetic and magneto-transport properties of polycrystalline Sm0.50Sr0.50MnO3 have been investigated. The presence of short-range magnetic order plays a crucial role in influencing electron transport, making it a promising pathway for tuning magnetoresistive properties for specific applications. This research focuses on the effects of magnetic nanoclusters on spin-dependent scattering and their impact on magneto-transport and magnetocaloric properties in polycrystalline Sm0.50Sr0.50MnO3. Experimental results reveal a significant magnetocaloric effect and notable magnetoresistance within the liquid nitrogen temperature range. At 100 K, the magnetoresistance reaches approximately 70% under an external magnetic field of 20 kOe. The magnetocaloric entropy change is calculated to be 3.5 J/kg-K for a 70 kOe magnetic field, with the entropy change curve exhibiting a broadened peak, leading to a substantial Relative Cooling Power (RCP). These findings enhance our understanding of the material’s behavior and highlight its potential for various technological applications.
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Journal articleAad G, Aakvaag E, Abbott B, et al., 2025,
Combination of searches for singly and doubly charged Higgs bosons produced via vector-boson fusion in proton–proton collisions at s=13 TeV with the ATLAS detector
, Physics Letters Section B Nuclear Elementary Particle and High Energy Physics, Vol: 860, ISSN: 0370-2693A combination of searches for singly and doubly charged Higgs bosons, H<sup>±</sup> and H<sup>±±</sup>, produced via vector-boson fusion is performed using 140 fb<sup>−1</sup> of proton–proton collisions at a centre-of-mass energy of 13 TeV, collected with the ATLAS detector during Run 2 of the Large Hadron Collider. Searches targeting decays to massive vector bosons in leptonic final states (electrons or muons) are considered. New constraints are reported on the production cross-section times branching fraction for charged Higgs boson masses between 200 GeV and 3000 GeV. The results are interpreted in the context of the Georgi-Machacek model for which the most stringent constraints to date are set for the masses considered in the combination.
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Journal articleAad G, Aakvaag E, Abbott B, et al., 2025,
Measurement of top-quark pair production in association with charm quarks in proton–proton collisions at s=13 TeV with the ATLAS detector
, Physics Letters Section B Nuclear Elementary Particle and High Energy Physics, Vol: 860, ISSN: 0370-2693Inclusive cross-sections for top-quark pair production in association with charm quarks are measured with proton–proton collision data at a center-of-mass energy of 13 TeV corresponding to an integrated luminosity of 140 fb<sup>−1</sup>, collected with the ATLAS experiment at the LHC between 2015 and 2018. The measurements are performed by requiring one or two charged leptons (electrons and muons), two b-tagged jets, and at least one additional jet in the final state. A custom flavor-tagging algorithm is employed for the simultaneous identification of b-jets and c-jets. In a fiducial phase space that replicates the acceptance of the ATLAS detector, the cross-sections for tt¯+≥2c and tt¯+1c production are measured to be 1.28<inf>−0.24</inf><sup>+0.27</sup>pb and 6.4<inf>−0.9</inf><sup>+1.0</sup>pb, respectively. The measurements are primarily limited by uncertainties in the modeling of inclusive tt¯ and tt¯+bb¯ production, in the calibration of the flavor-tagging algorithm, and by data statistics. Cross-section predictions from various tt¯ simulations are largely consistent with the measured cross-section values, though all underpredict the observed values by 0.5 to 2.0 standard deviations. In a phase-space volume without requirements on the tt¯ decay products and the jet multiplicity, the cross-section ratios of tt¯+≥2c and tt¯+1c to total tt¯+jets production are determined to be (1.23±0.25)% and (8.8±1.3)%.
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Journal articleAhmed A, Sharma J, Bhattacharya A, et al., 2025,
Unconventional Anomalous Hall Effect in Hexagonal Polar Magnet Y3Co8Sn4
, Advanced Functional Materials, ISSN: 1616-301XA rare realization of unconventional anomalous Hall effect (UAHE) both below and above the magnetic transition temperature (T<inf>C</inf>) in a hexagonal noncentrosymmetric magnet Y<inf>3</inf>Co<inf>8</inf>Sn<inf>4</inf>, using a combined experimental and ab initio calculations. Occurrence of such UAHE is mainly attributed to the reciprocal ((Formula presented.)) topology (i.e., the presence of topological Weyl points at/near the Fermi level), along with some contribution from the topological magnetic texture (at low temperatures), as inferred from the measured field-dependent ac susceptibility. The effect of UAHE on the measured transport behavior however evolves differently with temperature above and below T<inf>C</inf> = 53 K, suggesting different physical mechanism responsible in the two phases. A unique planar ferrimagnetic ordering is found to be the most stable state with ab-plane as the easy plane below T<inf>C</inf>. The simulated net magnetization and the moment per Co atom agrees fairly well with the experimentally measured values. A reasonably large anomalous Hall conductivity (AHC) is also observed in both the phases (above and below T<inf>C</inf>) of the present compound, which is again not so ubiquitous. The results underscore the family of R<inf>3</inf>Co<inf>8</inf>Sn<inf>4</inf> (R = rare earth) polar magnets as a compelling backdrop for exploring the synergy of magnetism and topological non-trivial electronic states, pivotal for spintronic applications.
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Journal articleGallagher J, Grant CM, Green MJ, et al., 2025,
Combination of searches for singly produced vectorlike top quarks in (Formula presented) collisions at (Formula presented) with the ATLAS detector
, Physical Review D, Vol: 111, ISSN: 2470-0010A combination of searches for the single production of vectorlike top quarks ((Formula presented)) is presented. These analyses are based on proton-proton collisions at (Formula presented) recorded in 2015-2018 with the ATLAS detector at the Large Hadron Collider, corresponding to an integrated luminosity of (Formula presented). The (Formula presented) decay modes considered in this combination are into a top quark and either a Standard Model Higgs boson or a (Formula presented) boson ((Formula presented) and (Formula presented)). The individual searches used in the combination are differentiated by the number of leptons ((Formula presented), (Formula presented)) in the final state. The observed data are found to be in good agreement with the Standard Model background prediction. Interpretations are provided for a range of masses and couplings of the vectorlike top quark for benchmark models and generalized representations in terms of 95% confidence level limits. For a benchmark signal prediction of a vectorlike top quark SU(2) singlet with electroweak coupling, (Formula presented), of 0.5, masses below 2.1 TeV are excluded, resulting in the most restrictive limits to date.
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Journal articleYoung R, Yoshida S, Xie C, et al., 2025,
Askaryan Radio Array: searching for the highest energy neutrinos
, European Physical Journal Special Topics, ISSN: 1951-6355Searches for ultra-high energy (Eν≥10 PeV) cosmogenic and astrophysical neutrinos (UHENs) have been conducted by several experiments over the last two decades. The Askaryan Radio Array (ARA), located near the geographical South Pole, was one of the first two experiments to use radio antennas sensitive to orthogonal polarizations for detection of neutrino-induced Askaryan radiation. ARA comprises five independent autonomous stations, with an additional low-threshold phased array string with station 5, which were deployed at a depth of 100–200 m over the period 2012–2018, corresponding to a total livetime of more than 27 station-years. In this article, we present a brief overview of the detector, its detection technique, and discuss a few of its major achievements with a focus on the current status of the array-wide UHEN search. We expect to produce the most sensitive results on the neutrino flux by any existing in-ice neutrino experiment below 1000 EeV energy.
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Journal articleAhmed A, Bhattacharya A, Singh P, et al., 2025,
Fermi Surface Nesting and Anomalous Hall Effect in Magnetically Frustrated Mn2PdIn
, Advanced Functional Materials, ISSN: 1616-301XNoncollinear magnets with near-zero net magnetization and nontrivial bulk electronic topology hold significant promise for spintronic applications, though their scarcity necessitates deliberate design strategies. In this work, a topologically nontrivial electronic structure is reported in metallic Mn<inf>2</inf>PdIn, which crystallizes in the inverse Heusler structure and exhibits a spin-glassy ground state with quenched magnetization. The system features Weyl-type band crossings near the Fermi level and reveals a novel interplay among momentum-space nesting, orbital hybridization, and spin-orbit coupling. Comprehensive magnetotransport measurements reveal a pronounced anomalous Hall effect (AHE) in Mn<inf>2</inf>PdIn. The observed quadratic relationship between the longitudinal and anomalous Hall resistivities highlights the dominance of the intrinsic Berry curvature contribution to the AHE. These findings establish inverse Heusler alloys as compelling platforms for realizing noncollinear magnets that host Weyl-type semimetallic or metallic phases-combining suppressed magnetization with robust electronic transport-thereby offering a promising route toward their seamless integration into next-generation spintronic devices.
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Journal articleHayrapetyan A, Tumasyan A, Adam W, et al., 2025,
Study of WH production through vector boson scattering and extraction of the relative sign of the W and Z couplings to the Higgs boson in proton-proton collisions at √S=13 Te
, PHYSICS LETTERS B, Vol: 860, ISSN: 0370-2693 -
Journal articleHayrapetyan A, Tumasyan A, Adam W, et al., 2025,
Search for bottom quark associated production of the standard model Higgs boson in final states with leptons in proton-proton collisions at √<i>s</i>=13 TeV
, PHYSICS LETTERS B, Vol: 860, ISSN: 0370-2693 -
Journal articleHayrapetyan A, Tumasyan A, Adam W, et al., 2025,
Search for a standard model-like Higgs boson in the mass range between 70 and 110 GeV in the diphoton final state in proton-proton collisions at √<i>s</i>=13 TeV
, PHYSICS LETTERS B, Vol: 860, ISSN: 0370-2693- Cite
- Citations: 2
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Journal articleAad G, Aakvaag E, Abbott B, et al., 2024,
Simultaneous Unbinned Differential Cross-Section Measurement of Twenty-Four Z+jets Kinematic Observables with the ATLAS Detector.
, Phys Rev Lett, Vol: 133Z boson events at the Large Hadron Collider can be selected with high purity and are sensitive to a diverse range of QCD phenomena. As a result, these events are often used to probe the nature of the strong force, improve Monte Carlo event generators, and search for deviations from standard model predictions. All previous measurements of Z boson production characterize the event properties using a small number of observables and present the results as differential cross sections in predetermined bins. In this analysis, a machine learning method called omnifold is used to produce a simultaneous measurement of twenty-four Z+jets observables using 139 fb^{-1} of proton-proton collisions at sqrt[s]=13 TeV collected with the ATLAS detector. Unlike any previous fiducial differential cross-section measurement, this result is presented unbinned as a dataset of particle-level events, allowing for flexible reuse in a variety of contexts and for new observables to be constructed from the twenty-four measured observables.
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Journal articleAaij R, Abdelmotteleb ASW, Beteta CA, et al., 2024,
Measurement of Λ<SUP>0</SUP><sub>b</sub>, Λ<SUP>+</SUP><sub>c</sub>, and Λ Decay Parameters Using Λ<SUP>0</SUP><sub>b</sub> →Λ<SUP>+</SUP><sub>c</sub> h<SUP>-</SUP> Decays
, PHYSICAL REVIEW LETTERS, Vol: 133, ISSN: 0031-9007- Cite
- Citations: 6
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Journal articlePal K, Dey S, Alam A, et al., 2024,
Revealing exchange bias in spin compensated systems for spintronics applications.
, Sci Rep, Vol: 14Antiferromagnetic materials offer potential for spintronic applications due to their resilience to magnetic field perturbations and lack of stray fields. Achieving exchange bias in these materials is crucial for certain applications; however, discovering such materials remains challenging due to their compensated spin structure. The quest for antiferromagnetic materials with exchange bias became a reality through our experimental study and theoretical simulation on Sr 2 FeIrO 6 and Sr 2 CoIrO 6 . This study also unveils the impact of ionic disorder and lattice distortion on magnetic properties. The presence of exchange bias in both materials, given their antiferromagnetic nature, is intriguing. This study opens up new avenues for achieving exchange bias in spin-compensated systems, offering potential for low power and ultra fast antiferromagnetic spintronic applications in future research endeavors.
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Journal articleChatterjee S, Das I, 2024,
Desertion of anomalous magnetic transition and emergence of metallic state in Cu doped Eu2Ru2O7 pyrochlore.
, J Chem Phys, Vol: 161In this paper, we present a detailed investigation of the structural, magnetic, and electrical transport properties of Eu2-xCuxRu2O7 (x = 0, 0.2, 0.4) pyrochlores. X-ray diffraction measurements confirm the single-phase nature of all samples and also manifest the reduction of lattice parameters with the increase in copper doping concentration. The experimental results of the magnetic measurements indicate that an anomalous magnetic transition around 23 K arises due to the contribution of non-magnetic Eu3+ ions. The strength of this unnatural magnetic transition reduces with decreasing Eu concentration [i.e., with increasing copper doping (x)] and finally disappears for x = 0.4. Moreover, electrical transport measurements reveal a considerable decrease in resistivity for Cu doped samples compared to undoped samples, which indicates the increase in charge carrier concentration with increasing Cu content.
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Journal articleAad G, Abbott B, Abdallah J, et al., 2024,
Operation and performance of the ATLAS tile calorimeter in LHC Run 2
, EUROPEAN PHYSICAL JOURNAL C, Vol: 84, ISSN: 1434-6044- Cite
- Citations: 2
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Journal articleHayrapetyan A, Tumasyan A, Adam W, et al., 2024,
Model-independent search for pair production of new bosons decaying into muons in proton-proton collisions at √s=13 TeV
, JOURNAL OF HIGH ENERGY PHYSICS- Cite
- Citations: 1
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Journal articleAaij R, Abdelmotteleb ASW, Abellan Beteta C, et al., 2024,
Analysis of Λ<SUP>0</SUP><sub>b</sub> →pK<SUP>-</SUP> μ<SUP>+</SUP> μ<SUP>-</SUP> decays
, JOURNAL OF HIGH ENERGY PHYSICS -
Conference paperCraplet A, 2024,
Sub-GeV particle identification with aerogel Cherenkov threshold detectors and tagged photon beam for the Water Cherenkov Test Experiment
, 42nd International Conference on High Energy Physics, Publisher: Sissa Medialab, Pages: 1114-1114 -
Journal articleAaij R, Abdelmotteleb ASW, Beteta CA, et al., 2024,
Measurement of <i>CP</i> Violation Observables in <i>D</i><SUP>+</SUP> → <i>K</i><SUP>-</SUP> <i>K</i><SUP>+</SUP> π<SUP>+</SUP> Decays
, PHYSICAL REVIEW LETTERS, Vol: 133, ISSN: 0031-9007- Cite
- Citations: 1
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Journal articleAad G, Aakvaag E, Abbott B, et al., 2024,
Disentangling Sources of Momentum Fluctuations in Xe plus Xe and Pb plus Pb Collisions with the ATLAS Detector
, PHYSICAL REVIEW LETTERS, Vol: 133, ISSN: 0031-9007- Cite
- Citations: 4
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Journal articleMazumdar D, Das K, Das I, 2024,
Magnetic exchange coupled composite behavior in the doped manganite nanoparticles: A proposed phenomenological model
, Physica B Condensed Matter, Vol: 695, ISSN: 0921-4526In this paper, we comprehensively investigate the isothermal magnetization behavior of doped perovskite manganite nanoparticles. The focus is on understanding the impact of variation of particle sizes on the soft and hard magnetic phases with respect to the changes in the coercive field and remanent magnetization, both theoretically and experimentally. The study seeks to correlate experimental findings with the proposed phenomenological model to gain deeper insights into the underlying mechanisms governing exchange coupling and anisotropy effects in the nanocrystalline composites. The proposed phenomenological model beautifully demonstrates how the values of saturation magnetization and coercive field changes with changing the particle size in the nanocrystalline La<inf>0.48</inf>Ca<inf>0.52</inf>MnO<inf>3</inf> (LCMO48) and La<inf>0.46</inf>Ca<inf>0.54</inf>MnO<inf>3</inf> (LCMO46) compounds. In addition, the model provide an insights into the limitations of critical radius, size and shape of the nanocrystalline particle. This investigation looks into how the size of particles affects their magnetic properties, specifically coercive field and remanent magnetization.
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Journal articleTaniuchi N, Abe K, Abe S, et al., 2024,
Search for proton decay via <i>p</i> → <i>e</i><SUP>+</SUP>η and <i>p</i> → μ<SUP>+</SUP>η with a 0.37 Mton-year exposure of Super-Kamiokande
, PHYSICAL REVIEW D, Vol: 110, ISSN: 2470-0010- Cite
- Citations: 2
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Journal articleDas K, Mazumdar D, Das I, 2024,
Structural distortion driven polaronic transport and table-like magnetocaloric properties in polycrystalline Tb0.7Sr0.3MnO3 compound.
, Phys Chem Chem Phys, Vol: 26, Pages: 29987-30001This research mainly explores the structural, magnetic, magneto-transport, and magnetocaloric properties of the polycrystalline Tb0.7Sr0.3MnO3 compound. The results reveal a significant modification of the compound's ground state with increasing the strength of the magnetic field. The strong distortion in the crystal structure highly controls the magnetic and magneto-transport properties of the system. Along with this, a prominent 'table-like' nature in the temperature-dependent magnetic entropy change has been noticed, showcasing the potential application of the compound in the field of Ericsson refrigeration technology. Notably, a substantial low-field magnetoresistance is noticed around T ∼ 60 K. The temperature dependent electrical resistivity data can be well explained with the help of polaronic transport conduction mechanisms namely small-polaron hopping and variable-range hopping models. Various significant parameters are calculated and the system possesses a non-adiabatic polaron hopping mechanism with a large electron-phonon coupling constant. This investigation contributes valuable insights into the intricate dynamics of the 3d-4f exchange interaction and crystallographic distortion, shedding light on the underlying mechanisms governing the magnetic and electrical transport properties of the Sr-doped TbMnO3 compound.
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Journal articleAaij R, Abdelmotteleb ASW, Abellan Beteta C, et al., 2024,
Study of the rare decay <i>J</i>/ψ → μ<SUP>+</SUP>μ<SUP>-</SUP>μ<SUP>+</SUP>μ<SUP>-</SUP>
, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479 -
Journal articleAaij R, Abdelmotteleb ASW, Beteta CA, et al., 2024,
Svtudy of charmonium production via the decay to p p at √s=13 TeV
, EUROPEAN PHYSICAL JOURNAL C, Vol: 84, ISSN: 1434-6044- Cite
- Citations: 2
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Journal articleHayrapetyan A, Tumasyan A, Adam W, et al., 2024,
Measurement of boosted Higgs bosons produced via vector boson fusion or gluon fusion in the H → b(b)over-bar decay mode using LHC proton-proton collision data at √<i>s</i>=13 TeV
, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479 -
Journal articleAaij R, Abdelmotteleb ASW, Abellan Beteta C, et al., 2024,
Measurement of the effective leptonic weak mixing angle
, JOURNAL OF HIGH ENERGY PHYSICS, ISSN: 1029-8479 -
Journal articleAad G, Aakvaag E, Abbott B, et al., 2024,
Measurements of Lund subjet multiplicities in 13 TeV proton-proton collisions with the ATLAS detector
, Physics Letters Section B Nuclear Elementary Particle and High Energy Physics, Vol: 859, ISSN: 0370-2693This Letter presents a differential cross-section measurement of Lund subjet multiplicities, suitable for testing current and future parton shower Monte Carlo algorithms. This measurement is made in dijet events in 140 fb<sup>−1</sup> of s=13 TeV proton–proton collision data collected with the ATLAS detector at CERN's Large Hadron Collider. The data are unfolded to account for acceptance and detector-related effects, and are then compared with several Monte Carlo models and to recent resummed analytical calculations. The experimental precision achieved in the measurement allows tests of higher-order effects in QCD predictions. Most predictions fail to accurately describe the measured data, particularly at large values of jet transverse momentum accessible at the Large Hadron Collider, indicating the measurement's utility as an input to future parton shower developments and other studies probing fundamental properties of QCD and the production of hadronic final states up to the TeV-scale.
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