The CMS collaboration reached a major milestone last week by submitting for publication its 900th paper. As you can see in CMS’ publications website, starting in early 2010, CMS has been publishing about 100 papers every year on physics analyses using LHC collision data. The publications timeline of the 880 collider-data papers, split by physics topics, is available online.
Last year alone, CMS published 141 papers, which correspond to an average weekly rate of about three papers. That was the highest number of publications ever to be published by a HEP experiment. This year, 2019, CMS has already submitted for publication 34 papers, and more than 40 papers are currently at an advanced stage of review within the collaboration. This list includes the LHC’s very first paper, which was based on the analysis of the full LHC Run 2 data set (2015-18), corresponding to 143 inverse femtobarns of integrated luminosity. This paper, describing the first observation of the two excited Bc particles, was already published on March 27 in Physical Review Letters.
On a more general level, so far there are 204 CMS papers based on LHC collision data with more than 100 citations (three with more than 1,000, 12 with more than 500, and 35 with more than 250). The most cited CMS physics paper to date is obviously the 32-page “Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC,” which was published in Physical Letters B. It currently has 9,258 citations.
Physicists at the Fermilab LHC Physics Center (LPC) have been playing leading roles in many CMS publications. In fact, about one quarter of the papers published by CMS in the last two years have the majority of their authors affiliated with the LPC. These include recent highlights such as the observation of the Higgs boson decay into a pair of bottom quarks and the first measurements of extremely rare Standard Model processes producing four top quarks or three heavy vector bosons. Besides studying these rare Standard Model processes, LPC physicists are leading cutting-edge searches for new physics in the CMS data. For example, searches for heavy resonances decaying into top quark pairs are reaching unprecedented sensitivity of multi-TeV mass scales. New ideas are also being actively pursued, such as how to look for slow particles that arrive in the detector with a significant delay after the collision has happened.
The CMS group at Fermilab is an integral and critical member of the LPC. Fermilab scientists and research associates have been key to the entire program of the CMS experiment, ranging from precision measurements of Standard Model parameters through searches for new phenomena as well as the discovery and characterization of the Higgs boson in various production and decay modes. New and innovative ideas are being explored at Fermilab these days. Among them are searches for self-interacting dark matter and new phenomena manifesting itself in events with semi-invisible jets. Fermilab physicists are also at the frontier of software and computing for analysis with the deployment of machine learning at both object reconstruction and event selection, the development of reconstruction algorithms and simulation toolkits to make efficient use of advanced architectures in high-performance computers. These efforts also include the use of novel artificial intelligence techniques.
Boaz Klima is a Fermilab scientist and chair of the CMS Publications Committee.