2,021 research outputs found
Spectroscopy and Decay of B Hadrons at the Tevatron
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
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
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
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
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
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
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
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 to , 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
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