Searches are performed for resonant and nonresonant Higgs boson pair production in the γγbb[over ¯] final state using 20 fb^{-1} of proton-proton collisions at a center-of-mass energy of 8 TeV recorded with the ATLAS detector at the CERN Large Hadron Collider. A 95% confidence level upper limit on the cross section times branching ratio of nonresonant production is set at 2.2 pb, while the expected limit is 1.0 pb. The difference derives from a modest excess of events, corresponding to 2.4 standard deviations from the background-only hypothesis. The limit observed in the search for a narrow X→hh resonance ranges between 0.7 and 3.5 pb as a function of the resonance mass.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1103/PhysRevLett.114.081802 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Indications, complications and outcomes of minimally-invasive lateral lumbar interbody fusion with anterior column realignment vs. standard LLIF using expandable interbody spacers.
Front Surg
December 2024
Spine Center of Eastern Switzerland, Cantonal Hospital of St. Gallen & Medical School of St. Gallen, St. Gallen, Switzerland.
Background: Anterior column realignment (ACR), using a lateral lumbar or thoracic interbody fusion (LLIF) approach to release the anterior longitudinal ligament (ALL), is a powerful technique to increase segmental lordosis. We here report our experience with the use of expandible LLIF cages for ACR.
Methods: Retrospective, single-center observational cohort study including consecutive patients treated by LLIF using an expandible interbody implant.
Impact of Next-to-Leading-Order Weak Standard-Model-Effective-Field-Theory Corrections in e^{+}e^{-}→ZH.
Phys Rev Lett
December 2024
High Energy Theory Group, Physics Department, Brookhaven National Laboratory, Upton, New York 11973, USA.
We present results from a complete next-to-leading order (NLO) calculation of e^{+}e^{-}→ZH in the standard model effective field theory (SMEFT) framework, including all contributions from dimension-six operators. At NLO, there are novel dependencies on CP violating parameters in the gauge sector, on modifications to the Higgs boson self-couplings, on alterations to the top quark Yukawa couplings, and on four-fermion operators involving the electron and the top quark, among others. We show that including only the logarithms resulting from renormalization group scaling can produce misleading results, and further, we explicitly demonstrate the constraining power of combining measurements from different energy scales.
View Article and Find Full Text PDFCost Savings in Chronic Pain Patients Initiating Peripheral Nerve Stimulation (PNS) with a 60-Day PNS Treatment.
Pain Ther
November 2024
SPR Therapeutics, Cleveland, OH, USA.
Article Synopsis
- This study examines the financial effects on healthcare payers of using 60-day peripheral nerve stimulation (60-Day PNS) compared to a conventional brief trial (PNS-BT) for chronic pain patients.
- Analysis of Medicare data revealed that patients starting with 60-Day PNS had lower costs and fewer complications when progressing to permanent implants compared to those starting with PNS-BT.
- Overall, the 60-Day PNS approach is more cost-effective, resulting in lower costs per successful treatment outcome for chronic pain management.
HHH whitepaper.
Eur Phys J C Part Fields
November 2024
Department of Physics, University of Wisconsin, Madison, WI 53706 USA.
Article Synopsis
- - The HHH Workshop held in Dubrovnik in July 2023 focused on advancing the understanding of the Higgs boson and its properties within the Standard Model (SM).
- - To confirm or challenge the SM, researchers need to measure the full potential of the Higgs, including the triple and quartic scalar couplings, particularly involving three scalar bosons at around 125 GeV.
- - The report highlights ongoing experimental efforts and theoretical models aimed at improving measurement rates and addressing challenges related to multi-scalar final states.
Emergent biaxiality in chiral hybrid liquid crystals.
Nat Commun
November 2024
Department of Physics and Chemical Physics Program, University of Colorado, Boulder, CO, USA.
Biaxial nematic liquid crystals are fascinating systems sometimes referred to as the Higgs boson of soft matter because of experimental observation challenges. Here we describe unexpected states of matter that feature biaxial orientational order of colloidal supercritical fluids and gases formed by sparse rodlike particles. Colloidal rods with perpendicular surface boundary conditions exhibit a strong biaxial symmetry breaking when doped into conventional chiral nematic fluids.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!