Lepton Flavor Universality Tests Using Bc+ Decays at LHCb

UMD graduate student Emily Jiang delivered a CERN seminar on May 19, 2026, unveiling an important new result on studies of Lepton Flavor Universality using decays of the heaviest B meson, Bc+, which has quark contents of a bottom-quark and anti-charm quark.   

The result is primarily the work of Jiang, UMD alumnus Zishuo Yang (Ph.D., 2023), Phoebe Hamilton and Hassan Jawahery, members of the Large Hadron Collider beauty experiment (LHCb) at CERN in Geneva, Switzerland.  It was a seven-year effort undertaken while the UMD group was also working on the development and construction of the new LHCb detector.LHCbLHCb

These results are of significant interest in the field because they show deviation from the Standard Model predictions. Previous measurements of similar quantities using the light B mesons from the BaBar experiment at SLAC, Belle Experiment at the KEK laboratory in Japan and the LHCb experiment at CERN are also in tension with the Standard Model. The new results show a similar trend, reinforcing the effect and has been highly anticipated in the field.

Jiang’s presentation can be seen here: https://indico.cern.ch/event/1685950/attachments/3277204/5855756/26-04-23_ejiang_CERN_seminar.pdf

For further information:

https://bolek.web.cern.ch/RJpsi/

https://lhcb-outreach.web.cern.ch/2026/05/19/lepton-flavor-universality-tests-using-bc-decays-at-lhcb/

Barkeshli Selected for Frontiers of Science Award

Research by Professor Maissam Barkeshli and colleagues has been selected by the International Congress of Basic Science (ICBS) as a recipient of the 2026 Frontiers of Science Award in Condensed Matter Physics. The paper cited was Symmetry fractionalization, defects, and gauging of topological phases by Barkeshli, Parsa Bonderson, Meng Cheng and Zhenghan Wang.Maissam BarkeshliMaissam Barkeshli

The Frontiers of Science Award, inaugurated in 2023 under the auspices of the ICBS, honors recent papers recognized for a major breakthrough in their respective fields and includes a nomination process and review by a panel of experts.

Awards will be presented at the International Congress of Basic Science in Beijing on August 9, 2026. 

Barkeshli has also received a Sloan Fellowship and an NSF Career Award, and was recently selected for a Simons Collaboration

Kara Hoffman Named Chair of Department of Physics

Professor Kara Hoffman was named chair of the Department of Physics, effective July 1, 2026.Kara Hoffman. Photo courtesy of same.Kara Hoffman. Photo courtesy of same.

“Kara Hoffman brings to this role a record of scholarly achievement and an understanding of the department's strengths and aspirations,” said Amitabh Varshney, dean of UMD’s College of Computer, Mathematical, and Natural Sciences. “As a longstanding member of our faculty, she is prepared to lead the department’s continued growth and success.”

The Department of Physics ranks No. 14 overall (and 5th among public institutions) in physics graduate programs according to U.S. News & World Report and has 50 tenured/tenure-track faculty members, nearly 600 students and annual research funding of over $30 million. 

“It is an honor to be chosen to chair a department of this prominence," Hoffman said. “The strength of the department derives from the talent of our faculty and students, the dedicated support of our staff, as well as our partnerships with some of the world’s preeminent research institutions.” 

Hoffman plans to continue recruiting outstanding faculty members and students and providing excellent opportunities outside the classroom for the large fraction of physics majors who conduct research.

“As chair, I look forward to supporting these activities, as well as looking for new opportunities and initiatives,” Hoffman added. “While these are challenging times for research funding, I believe we can emerge even stronger.”Kara Hoffman at the South Pole. Photo courtesy of same.Kara Hoffman at the South Pole. Photo courtesy of same.

Hoffman, who joined UMD in 2004, serves as the principal investigator on the National Science Foundation (NSF) grant that supports the analysis of data taken with the world’s largest neutrino telescope, the IceCube Neutrino Observatory at the South Pole. She has been conducting research at the observatory since the construction of the telescope commenced in 2004. 

Scientists have used IceCube to discover a population of high-energy neutrinos originating from outside our galaxy and from within the Milky Way plane. In addition, IceCube has made several contributions to particle physics, including the first observation of the Glashow resonance. 

Hoffman’s research has focused on multimessenger astrophysics, which aims to correlate information across multiple telescopes—including optical, gamma-ray and gravitational-wave instruments—often in real time, to identify some of the most energetic objects in our universe and gain a deeper understanding of the physical processes that drive them. 

In addition, Hoffman received an NSF Major Research Instrumentation grant that funded the construction of a next-generation neutrino array, the Askaryan Radio Array, also at the South Pole. The array is one of a few instruments pioneering a new detection technique that would extend the sensitivity of neutrino telescopes to higher energies.

Hoffman has held various leadership roles at UMD, including as director of the Center for Experimental Fundamental Physics (2012-15), as a faculty senator (2015-18) and as the department’s associate chair for undergraduate education (2016-20). In the latter role, she restructured the undergraduate laboratory sequence, facilitated the inclusion of active learning in undergraduate courses, recruited new instructors and oversaw the transition to online learning during the pandemic.  Hoffman is also a Fellow of the Joint Space-Science Institute and has served in various leadership roles within her field, including as a member of the executive committee of the Division of Particles and Fields at the American Physical Society (2010-13).Kara Hoffman at the South Pole. Photo courtesy of same.Kara Hoffman at the South Pole. Photo courtesy of same.

She has mentored more than a dozen postdoctoral researchers and graduate students. Hoffman earned her Ph.D. in high-energy physics in 1998 and her master’s degree in physics in 1994 from Purdue University and her bachelor’s degree in physics from the University of Kentucky in 1992. Before joining UMD, she was a Fellow at CERN and a research associate at the University of Chicago’s Enrico Fermi Institute. 

Hoffman succeeds Steve Rolston, who completed a 10-year term as physics chair. During Rolston’s tenure as chair, he hired 14 faculty members, founded the Mid-Atlantic Quantum Alliance, sponsored the Conference for Undergraduate Women in Physics, and sponsored four Conferences for Undergraduate Underrepresented Minorities in Physics—while also successfully navigating the department’s operations during the pandemic. During the past decade, six physics faculty members were elected to the National Academy of Sciences, four were named Distinguished University Professors and four were named Distinguished Scholar-Teachers. While chair, Rolston also maintained his own quantum research program, authoring 32 publications and graduating eight Ph.D. students.

College Celebrates 2026 Employee Award Recipients

The University of Maryland's College of Computer, Mathematical, and Natural Sciences (CMNS) celebrated its 2026 employee award recipients at an awards ceremony on May 1, 2026. This year's awardees were selected from a pool of hundreds of nominations from the Science Terp community. Chris Zapata received the Dean's Outstanding TA Award. Congratulations to all! Chris Zapata receives congratulations from CMNS Dean Amitabh Varshney.Chris Zapata receives congratulations from CMNS Dean Amitabh Varshney.

Dean’s Outstanding Teaching Assistant Award

Christopher Zapata, Department of Physics
Nominated by students, this award honors an undergraduate or a graduate student who is performing the role of teaching assistant for a course being taught by CMNS.

Dean’s Distinguished Research Scientist Award

Xi Shao, Research Scientist, Earth System Science Interdisciplinary Center
Recognizes the vital role played by research scientists in advancing the mission of the college. Honors research excellence evidenced by the discovery of new knowledge as demonstrated by published work in books, journals and leading conferences; invited talks, prizes, inventions, patents and other recognitions; and, as appropriate, the track record of their competitive research funding.

Dean’s Outstanding Employee Awards

Faye Levine, Graphic Designer, Dean's Office
Jessica Sadler, Program Manager, Department of Mathematics
Valerie Bonhomme, Program Administrative Specialist, Marine Estuarine Environmental Sciences
Katrina Dela Cruz, Storekeeper, Department of Cell Biology & Molecular Genetics
Recognizes employee dedication to the well-being and operation of the college and its administrative units. Awardees exemplify strong capability, commitment and service to both CMNS and the greater university community.

Dean’s Award for Excellence in Teaching

Timothy Canty, Associate Professor, Department of Atmospheric & Oceanic Science
Nominated by students, this award honors a tenured or tenure-track faculty member.

Dean’s Outstanding Lecturer Award

Maira Goytia, Senior Lecturer, Department of Biology
Nominated by students, this award honors a lecturer or instructor.

Thelma M. Williams Advisor of the Year Award

Haizhao Yang, Associate Professor, Department of Mathematics and Department of Computer Science
Nominated by students, this award honors a faculty or staff member who performs the service of advising undergraduate students in the college.

CMNS Board of Visitors Distinguished Faculty Award

Thomas Goldstein, Professor, Department of Computer Science
Honors a faculty member actively involved in a solid research program that has gained significant national and international attention.

CMNS Board of Visitors Junior Faculty Award 

Maria Molina, Assistant Professor, Department of Atmospheric & Oceanic Science
Honors an assistant professor who has not yet been granted tenure and has shown exceptional accomplishment in teaching and/or research, thus clearly establishing themselves as excellent faculty members.

CMNS Board of Visitors Creative Educator Award

Myungin Lee, Lecturer, Department of Computer Science
Honors a faculty member for cross-disciplinary education, collaboration with corporations and institutions outside the university, innovative approaches to education, enrichment of students' educational experience outside the classroom, and the embedding of entrepreneurship as an integral part of students' academic experience.

CMNS Board of Visitors Outstanding Graduate Student Award

Smrithan Ravichandran, Chemical Physics
Honors a CMNS doctoral graduate student who has advanced to candidacy and demonstrated scholarly and research excellence.

Additional images of the event are visible here:  2026 CMNS Awards gallery.