1,841 research outputs found

    Spectroscopy and Decay of B Hadrons at the Tevatron

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    This paper reviews the spectroscopy and decay of B hadrons at the Tevatron. We discuss the spectroscopy of excited B states (B**, Bs**) and the observation of the Sigma_b baryon at the Tevatron. The second part of this review discusses the decays of B hadrons and measurements of branching fractions. We focus on charmless two-body decays of B->hh.Comment: Contribution submitted to the proceedings of the Conference on Heavy Quarks and Leptons HQL 2007. 22 pages with 8 figures and 4 table

    B Physics at the Tevatron

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    After a five year upgrade period, the Fermilab experiments CDF and DO are taking high quality data in Run II of the Tevatron Collider. We report on the start-up of both detectors and present a selection of first B physics results from the Tevatron. We also compare different B hadron producers such as the Y(4S) with the hadron collider environment and discuss general features of B physics at a hadron collider.Comment: Posting for the archives: Invited review talk to appear in proceedings of "Physics at LHC" Conference held in Prague 200

    B States at the Tevatron

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    The CDF and D0 experiments have produced a wealth of heavy flavour physics results since the beginning of Run II of the Fermilab Tevatron. We review recent measurements of B hadron states including excited B states (B^{**}, B_s^{**}) and the Bc+ meson. We also summarize the discoveries of the Sigma_b baryon states and the Xi_b baryon.Comment: Contribution to proceedings of Heavy Quarks and Leptons, Melbourne, 2008. 6 pages with 6 figures and 1 tabl

    Physics of B0s Mesons and Bottom Baryons

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    We discuss the physics of B0s mesons focusing on CP violation in B0s -> J/Psi Phi decays at the Tevatron. We summarize measurements of the properties of bottom baryons at the Tevatron including the Sigma_b states and the Xi_b baryon. We also discuss the discovery of the Omega_b baryon.Comment: Contribution to proceedings of CIPANP 2009 conference, La Jolla, May 2009. 4 pages with 2 figure

    Properties of Heavy B Hadrons

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    We review recent measurements of heavy B hadron states including masses and lifetimes of the Bc meson as well as excited B states (B**, Bs**). We discuss properties of the Bs meson such as lifetime, lifetime difference delta_Gamma/Gamma and CP violation in Bs -> J/Psi Phi decays. We also summarize new measurements of the masses and lifetimes of bottom baryons including the Lambda_b baryon, the Sigma_b baryon states as well as the Xi_b and Omega_b baryons.Comment: Plenary talk at ICHEP08, Philadelphia, USA, July 2008. 15 pages with 10 figures and 1 table. Fixed typo

    Future of B Physics at CDF and DO

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    In this contribution to the panel discussion on ``The Future of Hadron B Experiments'' held at the 8th International Conference on B Physics at Hadron Machines (Beauty 2002) at Santiago de Compostela, Spain, we explore the physics potential for B physics at CDF and DO in five years and beyond. After a brief introduction to precision flavour physics, we concentrate our discussion on the future of CP violation by evaluating the prospects for measuring the CKM angles beta, gamma and alpha at the Tevatron Collider experiments CDF and DO by the end of Run II.Comment: Posting for the archives: Contribution to Panel Discussion on "The Future of Hadron B Experiments". Pub. Proceedings Beauty 2002: 8th International Conference on B Physics at Hadron Machines, Santiago de Compostela, Spai

    Brief Report from the Tevatron

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    We report on the B physics prospects from the Fermilab Tevatron, summarizing the B physics goals of the CDF and DO experiments using their upgraded detectors. We discuss the time schedule for completion of the detector upgrades and summarize the current measurement of the CP violation parameter sin(2 beta) at CDF.Comment: Final version as it will appear in Proceedings of XIX International Symposium on Lepton and Photon Interactions at High Energies, Stanford University, August 9-14, 1999. 8 pages plus title page; 5 figure

    Autoencoder-based Online Data Quality Monitoring for the CMS Electromagnetic Calorimeter

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    The online Data Quality Monitoring system (DQM) of the CMS electromagnetic calorimeter (ECAL) is a crucial operational tool that allows ECAL experts to quickly identify, localize, and diagnose a broad range of detector issues that would otherwise hinder physics-quality data taking. Although the existing ECAL DQM system has been continuously updated to respond to new problems, it remains one step behind newer and unforeseen issues. Using unsupervised deep learning, a real-time autoencoder-based anomaly detection system is developed that is able to detect ECAL anomalies unseen in past data. After accounting for spatial variations in the response of the ECAL and the temporal evolution of anomalies, the new system is able to efficiently detect anomalies while maintaining an estimated false discovery rate between 10−210^{-2} to 10−410^{-4}, beating existing benchmarks by about two orders of magnitude. The real-world performance of the system is validated using anomalies found in 2018 and 2022 LHC collision data. Additionally, first results from deploying the autoencoder-based system in the CMS online DQM workflow for the ECAL barrel during Run 3 of the LHC are presented, showing its promising performance in detecting obscure issues that could have been missed in the existing DQM system.Comment: Submitted to the Proceedings of 21st International Workshop on Advanced Computing and Analysis Techniques in Physics Research ACAT 2022 conferenc