Negative / Null Result ReportOpen accessComputer Science
Samson Clymton, Sang-Ho Kim, Hyun-Chul Kim · 2026 · arXiv
We investigate $J/ψ$ photoproduction off the proton, $γp \to J/ψp$, to elucidate the nonexistence of hidden-charm pentaquark signals reported by the GlueX and CLAS12 experiments. Within a coupled-channel rescattering mechanism, we employ the transition amplitudes from a previous coupled-channel analysis that dynamically generates the $P_{c\bar{c}}$ states. The kernel amplitudes for the transition to the $J/ψN$ channel include both $t$-channel heavy-meson exchange and $u$-channel heavy-baryon exchange. We find that the rescattering contributions from the $\bar{D}^{(*)}Σ_c$ channels -- indispens
View details →Negative / Null Result ReportOpen accessComputer Science
Ho-Chin Tsai, Kwei-Chou Yang · 2013 · arXiv
We take into account a generic form of a Dirac fermionic dark matter (DM), which communicates with the Standard Model quarks via a scalar mediator, in a model-independent way. Four special interaction scenarios are investigated, where one is parity conserving and the other three are parity violating. Three of them result in the $v$ suppressed DM-nucleon cross sections, where $v \sim 10^{-3} c$ is the velocity of the DM in the laboratory frame. We constrain the masses of the dark matter and mediator as well as the couplings from the thermal relic abundance, and the recent results of the XENON10
View details →Negative / Null Result ReportOpen accessComputer Science
Riccardo Catena, Paolo Gondolo · 2014 · arXiv
The effective theory of isoscalar dark matter-nucleon interactions mediated by heavy spin-one or spin-zero particles depends on 10 coupling constants besides the dark matter particle mass. Here we compare this 11-dimensional effective theory to current observations in a comprehensive statistical analysis of several direct detection experiments, including the recent LUX, SuperCDMS and CDMSlite results. From a multidimensional scan with about 3 million likelihood evaluations, we extract the marginalized posterior probability density functions (a Bayesian approach) and the profile likelihoods (a
View details →Negative / Null Result ReportOpen accessPhysics
Rodger I. Thompson, Jill Bechtold, John H. Black et al. · 2009 · arXiv
In an effort to resolve the discrepancy between two measurements of the fundamental constant mu, the proton to electron mass ratio, at early times in the universe we reanalyze the same data used in the earlier studies. Our analysis of the molecular hydrogen absorption lines in archival VLT/UVES spectra of the damped Lyman alpha systems in the QSOs Q0347-383 and Q0405-443 yields a combined measurement of a (Delta mu)/mu value of (-7 +/- 8) x 10^{-6}, consistent with no change in the value of mu over a time span of 11.5 gigayears. Here we define (Delta mu) as (mu_z - mu_0) where mu_z is the valu
View details →Negative / Null Result ReportOpen accessPhysics
T. Liu, K. Rolfs, I. Fan et al. · 2020 · arXiv
By measuring the nuclear magnetic spin precession frequencies of polarized $^{129}$Xe and $^{3}$He, a new upper limit on the $^{129}$Xe atomic electric dipole moment (EDM) $ d_\mathrm{A} (^{129}\mathrm{Xe})$ was reported in Phys. Rev. Lett. 123, 143003 (2019). Here, we propose a new evaluation method based on global phase fitting (GPF) for analyzing the continuous phase development of the $^{3}$He-$^{129}$Xe comagnetometer signal. The Cramer-Rao Lower Bound on the $^{129}$Xe EDM for the GPF method is theoretically derived and shows the potential benefit of our new approach. The robustness of t
View details →Negative / Null Result ReportOpen accessPhysics
Yun-Jing Huang, Yuji Urata, Kuiyun Huang et al. · 2020 · arXiv
We present the result of a search for orphan Gamma-Ray Burst (GRB) afterglows in the Pan-STARRS1 (PS1) COSMOS survey. There is extensive theoretical and observational evidence suggesting that GRBs are collimated jets; the direct observation of orphan GRB afterglows would further support this model. An optimal survey strategy is designed by coupling the PS1 survey with the Subaru/Hyper-Suprime-Cam (HSC) survey. The PS1 COSMOS survey, one of the survey fields in the PS1 Medium Deep Survey (PS1/MDS), searches a field of 7 deg$^2$ from December 2011 to January 2014, reaching a limiting magnitude R
View details →Negative / Null Result ReportOpen accessPhysics
D. Abriola, F. T. Avignone, R. L. Brodzinski et al. · 1998 · arXiv
Data collected during three years with a germanium spectrometer at the Sierra Grande underground laboratory have been analyzed for distinctive features of annual modulation of the signal induced by WIMP dark matter candidates. The main motivation for this analysis was the recent suggestion by the DAMA/NaI Collaboration that a yearly modulation signal could not be rejected at the 90% confidence level when analyzing data obtained with a high-mass low-background scintillator detector. We performed two different analyses of the data: First, the statistical distribution of modulation-significance v
View details →Negative / Null Result ReportOpen accessComputer Science
Chan-Chi Chiou, Otto C. W. Kong, Rishikesh D. Vaidya · 2007 · arXiv
We present a detailed analysis of the neutron, deuteron and mercury electric dipole moment from supersymmetry without R parity, focusing on the quark-scalar loop contributions. Being proportional to top Yukawa and top mass, such contributions are often large. Analytical expressions illustrating the explicit role of the R-parity violating parameters are given following perturbative diagonalization of mass-squared matrices for the scalars. Dominant contributions come from the combinations $B_i λ^{\prime}_{ij1}$ for which we obtain robust bounds. It turns out that neutron and deuteron EDMs receiv
View details →Negative / Null Result ReportOpen accessPhysics
Pasquale Galianni, Martin Feix, Hongsheng Zhao et al. · 2011 · arXiv
A unique signature of the modified Newtonian dynamics (MOND) paradigm is its peculiar behavior in the vicinity of the points where the total Newtonian acceleration exactly cancels. In the Solar System, these are the saddle points of the gravitational potential near the planets. Typically, such points are embedded into low-acceleration bubbles where modified gravity theories a` la MOND predict significant deviations from Newton's laws. As has been pointed out recently, the Earth-Sun bubble may be visited by the LISA Pathfinder spacecraft in the near future, providing a unique occasion to put th
View details →Negative / Null Result ReportOpen accessPhysics
Khun Sang Phukon, Gregory Baltus, Sarah Caudill et al. · 2021 · arXiv
We perform a search for binary black hole mergers with one subsolar mass black hole and a primary component above $2 M_\odot$ in the second observing run of LIGO/Virgo. Our analysis therefore extends previous searches into a mass region motivated by the presence of a peak in any broad mass distribution of primordial black holes (PBHs) around $[2-3] M_\odot$ coming from the equation of state reduction at the QCD transition. Four candidate events are found passing a false alarm rate (FAR) threshold of 2 per year, although none are statistically significant enough for being clear detections. We f
View details →Negative / Null Result ReportOpen accessPhysics
Víctor Navas-Portella, Abigail Jiménez, Álvaro Corral · 2018 · arXiv
Coulomb-stress theory has been used for years in seismology to understand how earthquakes trigger each other. Whenever an earthquake occurs, the stress field changes, and places with positive increases are brought closer to failure. Earthquake models that relate earthquake rates and Coulomb stress after a main event, such as the rate-and-state model, assume that the magnitude distribution of earthquakes is not affected by the change in the Coulomb stress. By using different slip models, we calculate the change in Coulomb stress in the fault plane for every aftershock after the Landers event (C
View details →Negative / Null Result ReportOpen accessComputer Science
Ohad Inbar, Joachim Meyer · 2022 · arXiv
The 'intuitive' trust people feel when encountering robots in public spaces is a key determinant of their willingness to cooperate with these robots. We conducted four experiments to study this topic in the context of peacekeeping robots. Participants viewed scenarios, presented as static images or animations, involving a robot or a human guard performing an access-control task. The guards interacted more or less politely with younger and older male and female people. Our results show strong effects of the guard's politeness. Age and sex of the people interacting with the guard had no signific
View details →Negative / Null Result ReportOpen accessPhysics
Anuj Chaudhri, Jennifer R. Lukes · 2012 · arXiv
Homogeneous nucleation of a vapor bubble from a bulk metastable phase is studied here for the first time using the multibody dissipative particle dynamics model. The van der Waals equation of state is used to define a conservative force that describes the model fluid used in this study. Additional computational tools were developed to help visualize the vapor bubble formed in the system. Continuum thermodynamic ideas are used to help identify the bubble interface and separate particles that constitute the vapor bubble and bulk liquid regions respectively. Using this idea, the density variation
View details →Negative / Null Result ReportOpen accessEngineering
Ezra Tampubolon, Haris Ceribasic, Holger Boche · 2020 · arXiv
Congestion game is a widely used model for modern networked applications. A central issue in such applications is that the selfish behavior of the participants may result in resource overloading and negative externalities for the system participants. In this work, we propose a pricing mechanism that guarantees the sub-linear increase of the time-cumulative violation of the resource load constraints. The feature of our method is that it is resource-centric in the sense that it depends on the congestion state of the resources and not on specific characteristics of the system participants. This f
View details →Negative / Null Result ReportOpen accessPhysics
S. S. Tie, C. S. Kochanek · 2017 · arXiv
Quasar microlensing analyses implicitly generate a model of the variability of the source quasar. The implied source variability may be unrealistic yet its likelihood is generally not evaluated. We used the damped random walk (DRW) model for quasar variability to evaluate the likelihood of the source variability and applied the revised algorithm to a microlensing analysis of the lensed quasar RX J1131-1231. We compared the estimates of the source quasar disk and average lens galaxy stellar mass with and without applying the DRW likelihoods for the source variability model and found no signific
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B Gu, J Chetwood, A Pudipeddi et al. · 2026 · Journal of Crohn’s and Colitis
Abstract Background Emerging evidence suggests early initiation of advanced therapies (AT) may improve outcomes, but optimal timing remains unclear. We aimed to assess the impact of AT timing on persistence. Methods We interrogated the…
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Ching-Tai Huang, Avijit Dutta, Tse-Ching Chen et al. · 2016 · The Journal of Immunology
Abstract The host immune system responds to influenza virus infection for eradication of the virus but the immune response associated inflammation causes tissue injury and damage to the host as well. Severe influenza with morbidity and…
View details →Negative / Null Result ReportMedicine
Balcı, Saltık, Aktemur et al. · 2026 · Life (Basel, Switzerland)
The migrating myoelectric complex (MMC) is the electrical basis of fasting small intestinal motility. Although oxytocin (OT) regulates gastrointestinal functions through oxytocin receptors (OTRs), its effect on jejunal MMC activity during…
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Samar Mahmoud Elbahy, Ola Galal Ali, Sara Soliman Ali et al. · 2024 · Egyptian Pediatric Association Gazette
Abstract Background Among preterm babies, patent ductus arteriosus (PDA) is a prevalent condition, and hemodynamically significant patent ductus arteriosus (hsPDA) constitutes an important problem that impacts their outcome. There has…
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Fishella Aprista Rahmanti, Willy Sandhika, Lusiani Tjandra · 2025 · Folia Medica Indonesiana
Residual Cancer Burden (RCB) is a validated scoring system that quantifies the amount of tumour remaining after neoadjuvant chemotherapy (NAC) for breast cancer, providing prognostic information beyond binary outcomes, such as pathologic…
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David Camacho, Denise Burnette, Maria P Aranda et al. · 2019 · Innovation in Aging
Abstract Loneliness and pain are significant public health problems in later life, yet limited research has examined how these factors interact among racially diverse older adults. Guided by the Biopsychosocial Model of Pain, we used data…
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Arni Gershman, Rivka Farkash, Amjad Abu-Salman et al. · 2025 · Journal of Clinical Medicine
Background: Atrial fibrillation (AF) is a common tachyarrhythmia associated with increased morbidity. AF frequently occurs alongside mitral regurgitation (MR). Although the impact of MR severity on AF is well proven, its effect on AF…
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M Shvydka, M Lutay, I Golikova · 2026 · European Heart Journal - Cardiovascular Imaging
Abstract Introduction Non-invasive diagnostic methods for coronary artery disease (CAD) are gaining increasing importance due to their accessibility, diagnostic value, safety, and cost-effectiveness. Both global longitudinal strain (GLS)…
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Ameera Al-Humidi, Mohammed Abdulsalam · 2025 · Yemeni Journal for Medical Sciences
Background: Sleep deprivation is total or partial absence of sleep. It is a risk factor for many diseases including disorders of reproductive system. Objective: This study aimed to investigate the correlation between sleep deprivation and…
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Peter J. Millett, Sean Smith, Charles Ho et al. · 2014 · Orthopaedic Journal of Sports Medicine
Objectives: Significant Association Between Snapping Scapula Syndrome and Anterior Angulation of the Superomedial Scapular Angle. Methods: In this Institutional Review Board approved study, bony morphologies of the scapula were evaluated…
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Yoshitaka Okabe, Hisayosi Murai, souichiro usui et al. · 2015 · Circulation
Background: Simplicity HTN-3 trial showed the negative result for renal denervation (RDN) in patient with resistant hypertension. One of limitations was that no appreciate evaluation of renal sympathetic nerve activity (RSNA) was applied…
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C Hur, V Nanavaty, A Chehab et al. · 2021 · Human Reproduction
Abstract Study question Does mitochondrial DNA content (mtDNA) correlate with clinical parameters and embryo morphokinetics using advanced time-lapse technology? Summary answer mtDNA correlated with embryo morphokinetics and the growth…
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Y Obayashi, S C Butcher, X Galloo et al. · 2026 · European Heart Journal - Cardiovascular Imaging
Abstract Background/Introduction Right ventricular (RV) function is a key factor in risk stratification of patients with tricuspid regurgitation (TR). Right ventricular myocardial work (RVMW) has been proposed as a novel echocardiographic…
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Manabu Akagawa, Roberto Berebichez‐Fridman, Loic Villet et al. · 2026 · Knee Surgery, Sports Traumatology, Arthroscopy
Abstract Purpose This study aimed to clarify the clinical relevance of quadriceps tendon alignment (QTA), focusing on the quadriceps tendon axial angle (QTAx), in patients undergoing ‘physiological total knee arthroplasty (TKA)’. This…
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Meng Meng, Daoyi Gong, Yunfei Lan et al. · 2024 · International Journal of Disaster Risk Science
Abstract The recent increase of regional wildfire occurrences has been associated with climate change. In this study, we investigated the association between the February to March wildfire points and burned area in the southern region of…
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