University of Minnesota
School of Physics & Astronomy
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Hajime Muramatsu

PAN 424 (office), 624-7861
OMWL 450 (lab)
muramatsu @

Summary of Interests
Particle Physics

About My Work

I am mainly working on Charm Physics at BESIII ( currently that utilizes samples taken at the BEPCII e+e- symmetric collider (Ecm ~ 2-4 GeV). I have been also serving as a co-convener of the Charm analysis group in the BESIII collaboration since 2012.

Recently, my focus has been to search for rare/forbidden decays of D mesons based on the BESIII data which is the largest sample of psi(3770) taken at the threshold of DDbar production in the world.
I am also interested in Physics analyses that employ the quantum coherent effect between a pair of DDbar produced in the BESIII sample.

As a co-convener of the Charm group, I am also leading the preparation for the up coming Ds data taking and the corresponding Physics analyses. We will have 3/fb of e+e- annihilation sample at around Ecm = 4.180 GeV by the end of Spring 2016 which allows us to perform various precision measurements and rare/forbidden searches in Ds decays.

I am also involved with the project, Mu2e ( and very much anxious to see its data taking start in the near future. The Mu2e tracker is made from ~20k straw tubes for which the local Minnesota group are performing gas leak test.

Selected Publications

M. Ablikim et al. (BESIII Collaboration), Search for D0 -> gamma gamma and improved measurement of the branching fraction for D0 -> pi0pi0, Phys.Rev.D91, 112015 (2015)

H. Muramatsu, Search for D0 -> gamma gamma at BESIII, Proceeding of the 5th International Workshop on Charm Physics: arXiv:1208.4744

J. Y. Ge et al. (CLEO Collaboration), Branching fractions for Y(3S) -> pi0 hb and psi(2S) -> pi0 hc, Phys.Rev.D84, 032008 (2011)

M. Kornicer et al. (CLEO Collaboration), Measurements of branching fractions for electromagnetic transitions involving the chi_bJ(1P) states, Phys.Rev.D83, 054003 (2011)

G. Bonvicini et al. (CLEO Collaboration), Measurement of the eta_b(1S) mass and the branching fraction for Y(3S) -> gamma eta_b(1S), Phys.Rev.D81, 031104 (2010)

Q. He et al. (CLEO Collaboration), Observation of Y(2S) -> eta Y(1S) and Search for Related Transitions, Phys.Rev.Lett.101, 192001 (2008)

D. M. Asner et al. (CLEO Collaboration), Observation of chi_bJ(1P,2P) decays to light hadrons, Phys.Rev.D78, 091103 (2008)

D. Besson et al. (CLEO Collaboration), Measurement of xsec(e+e- -> psi(3770) -> hadrons) at Ecm = 3773 MeV, Phys.Rev.Lett.96, 092002 (2006)

J. L. Rosner et al. (CLEO Collaboration), Observation of the h_c(1P) State of Charmonium, Phys.Rev.Lett.95, 102003 (2005), Phys.Rev.D72, 092004 (2005)

M. Artuso et al. (CLEO Collaboration), Photon Transitions in Y(2S) and Y(3S) Decays, Phys.Rev.Lett.94, 032001 (2005)

S. B. Athar et al. (CLEO Collaboration), Photon transitions in psi(2S) decays to chi_cJ(1P) and eta_c(1S), Phys.Rev.D70, 112002 (2004)