We present the first observation of exclusive e(+)e(-) production in hadron-hadron collisions, using pp[over] collision data at (square root) s = 1.96 TeV taken by the run II Collider Detector at Fermilab, and corresponding to an integrated luminosity of 532 pb(-1). We require the absence of any particle signatures in the detector except for an electron and a positron candidate, each with transverse energy E(T) > 5 GeV and pseudorapidity |eta| < 2. With these criteria, 16 events are observed compared to a background expectation of 1.9+/-0.3 events. These events are consistent in cross section and properties with the QED process pp[over] --> p + e(+)e(-) + p[over] through two-photon exchange. The measured cross section is 1.6(-0.3)(+0.5)(stat) +/- 0.3(syst) pb. This agrees with the theoretical prediction of 1.71+/-0.01 pb.
Download full-text PDF |
Source |
---|---|
http://dx.doi.org/10.1103/PhysRevLett.98.112001 | DOI Listing |
Tissue Eng Part A
January 2025
Department of Plastic and Reconstructive Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan.
Adipose tissue engineering requires effective strategies for regenerating adipose tissue, with adipose-derived stem cells (ASCs) being favored due to their robust self-renewal capacity and multipotent differentiation potential. In this study, the efficacy of poly-L-lactic acid (PLLA) mesh containing collagen sponge (CS), seeded with ASCs to promote adipose tissue formation, was investigated. PLLA-CS implants seeded with GFP-positive ASCs were inserted at high concentration (1 × 10 cells/implant, H-ASC) and low concentration (1 × 10 cells/implant, L-ASC), as were unseeded controls.
View Article and Find Full Text PDFInvest Ophthalmol Vis Sci
January 2025
Eye Institute, Affiliated Hospital of Nantong University, Medical School of Nantong University, Nantong, Jiangsu, China.
Purpose: To investigate potential modes of programmed cell death in the lens epithelial cells (LECs) of patients with early age-related cortical cataract (ARCC) and to explore early-stage intervention strategies.
Methods: Anterior lens capsules were collected from early ARCC patients for comprehensive analysis. Ultrastructural examination of LECs was performed using transmission electron microscopy.
Infect Drug Resist
January 2025
Center of Infectious Diseases, West China Hospital of Sichuan University, Chengdu, Sichuan, 610041, People's Republic of China.
Objective: The artificial liver support system (ALSS) has been recruited as an available method for patients with acute-on-chronic liver failure (ACLF), but its impact on the outcome of ACLF remains controversial. This study aimed to investigate the association between ALSS treatment and short-term prognosis of hepatitis B-related ACLF (HBV-ACLF).
Methods: This was a retrospective observational cohort study, and data were obtained from the Center of Infectious Diseases, West China Hospital of Sichuan University, between Mar 2015 and December 2021.
J Orthop Case Rep
January 2025
Department of Orthopaedic Surgery, Sangre Grande Hospital, Sangre Grande, Trinidad and Tobago.
Background: In recent years, there has been a growing utilization of minimally invasive (MI) techniques, which provide the potential advantages of minimizing surgical stress, post-operative pain, and hospitalization duration. Nevertheless, the existing body of literature primarily comprises of studies conducted at a single medical site, which are of low quality and lack a comprehensive analysis of treatment techniques exclusively focused on spondylolisthesis. We conducted this systematic review and meta-analysis to compare minimally invasive surgery (MIS) and open surgery (OS) spinal fusion outcomes for the treatment of spondylolisthesis.
View Article and Find Full Text PDFImmune Netw
December 2024
Department of KONKUK-KIST Biomedical Science & Technology, Konkuk University, Seoul 05029, Korea.
Pathogen-associated molecular patterns (PAMPs) are highly conserved motifs originating from microorganisms that act as ligands for pattern recognition receptors (PRRs), which are crucial for defense against pathogens. Thus, PAMP-mimicking vaccines may induce potent immune activation and provide broad-spectrum protection against microbes. Dextran encapsulation can regulate the surface characteristics of nanoparticles (NPs) and induces their surface modification.
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!