Yazar "Achasov, M.N." seçeneğine göre listele

Listeleniyor 1 - 3 / 3
  • Küçük Resim Yok
    Öğe
    Measurement of the e+e-??+?-cross section between 600 and 900 MeV using initial state radiation
    (Elsevier B.V., 2016) Ablikim, M.; Achasov, M.N.; Adlarson, P.; Ahmed, S.; Albrecht, M.; Aliberti, R.; Çetin, Serkant Ali
    We extract the e+e-??+?- cross section in the energy range between 600 and 900 MeV, exploiting the method of initial state radiation. A data set with an integrated luminosity of 2.93 fb-1 taken at a center-of-mass energy of 3.773 GeV with the BESIII detector at the BEPCII collider is used. The cross section is measured with a systematic uncertainty of 0.9%. We extract the pion form factor |F?|2 as well as the contribution of the measured cross section to the leading-order hadronic vacuum polarization contribution to (g-2)?. We find this value to be a???,LO(600-900MeV)=(368.2±2.5stat±3.3sys)10-10, which is between the corresponding values using the BaBar or KLOE data. © 2015 The Authors.
  • Küçük Resim Yok
    Öğe
    Measurements of Born cross sections of e+e- ? Ds?+ DsJ- + c. c.
    (American Physical Society, 2021) Ablikim, M.; Achasov, M.N.; Adlarson, P.; Ahmed, S.; Albrecht, M.; Aliberti, R.; Çetin, Serkant Ali
    The Born cross sections are measured for the first time for the processes e+e-?Ds?+Ds0?(2317)-+c.c. and e+e-?Ds?+Ds1(2460)-+c.c. at the center-of-mass energy s=4.600 GeV, 4.612 GeV, 4.626 GeV, 4.640 GeV, 4.660 GeV, 4.68 GeV, and 4.700 GeV, and for e+e-?Ds?+Ds1(2536)-+c.c. at s=4.660 GeV, 4.680 GeV, and 4.700 GeV, using data samples collected with the BESIII detector at the BEPCII collider. No structures are observed in cross-section distributions for any of the processes. © 2021 authors. Published by the American Physical Society.
  • Küçük Resim Yok
    Öğe
    Observation of the decay D0 ??-?+??
    (American Physical Society, 2021) Ablikim, M.; Achasov, M.N.; Adlarson, P.; Ahmed, S.; Albrecht, M.; Aliberti, R.; Çetin, Serkant Ali
    By analyzing an e+e- annihilation data sample corresponding to an integrated luminosity of 2.93 fb-1 collected at a center-of-mass energy of 3.773 GeV with the BESIII detector, we measure the branching fraction of the D0??-?+?? decay for the first time. We obtain BD0??-?+??=(1.35±0.09stat±0.09syst)×10-3. Using the world average of BD0??-e+?e, we find a branching fraction ratio of BD0??-?+??/BD0??-e+?e=0.90±0.11, which agrees with the theoretical expectation of lepton flavor universality within the uncertainty. Combining the world average of BD+??0?+?? and the lifetimes of D0(+), we obtain a partial decay width ratio of ?D0??-?+??/(2?D+??0?+??)=0.71±0.14, which is consistent with the isospin symmetry expectation of unity within 2.1?. For the reported values of BD0??-?+??/BD0??-e+?e and ?D0??-?+??/2?D+??0?+??, the uncertainty is the quadratic sum of the statistical and systematic uncertainties. © 2021 authors. Published by the American Physical Society.