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@ARTICLE{Lhde:889271,
      author       = {Lähde, Timo A. and Meißner, Ulf-G. and Epelbaum, Evgeny},
      title        = {{A}n update on fine-tunings in the triple-alpha process},
      journal      = {The European physical journal / A},
      volume       = {56},
      number       = {3},
      issn         = {1434-601X},
      address      = {Heidelberg},
      publisher    = {Springer},
      reportid     = {FZJ-2021-00176},
      pages        = {89},
      year         = {2020},
      abstract     = {The triple-alpha process, whereby evolved stars create
                      carbon and oxygen, is believed to be fine-tuned to a high
                      degree. Such fine-tuning is suggested by the unusually
                      strong temperature dependence of the triple-alpha reaction
                      rate at stellar temperatures. This sensitivity is due to the
                      resonant character of the triple-alpha process, which
                      proceeds through the so-called “Hoyle state” of 12C with
                      spin-parity 0+. The question of fine-tuning can be studied
                      within the ab initio framework of nuclear lattice effective
                      field theory, which makes it possible to relate ad hoc
                      changes in the energy of the Hoyle state to changes in the
                      fundamental parameters of the nuclear Hamiltonian, which are
                      the light quark mass mq and the electromagnetic
                      fine-structure constant αem. Here, we update the effective
                      field theory calculation of the sensitivity of the
                      triple-alpha process to small changes in the fundamental
                      parameters. In particular, we consider recent high-precision
                      lattice QCD calculations of the nucleon axial coupling gA,
                      as well as new and more comprehensive results from stellar
                      simulations of the production of carbon and oxygen. While
                      the updated stellar simulations allow for much larger ad hoc
                      shifts in the Hoyle state energy than previously thought,
                      recent lattice QCD results for the nucleon S-wave singlet
                      and triplet scattering lengths now disfavor the “no
                      fine-tuning scenario” for the light quark mass mq.},
      cin          = {IAS-4 / IKP-3 / JARA-HPC},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IAS-4-20090406 / I:(DE-Juel1)IKP-3-20111104 /
                      $I:(DE-82)080012_20140620$},
      pnm          = {511 - Computational Science and Mathematical Methods
                      (POF3-511) / DFG project 196253076 - TRR 110: Symmetrien und
                      Strukturbildung in der Quantenchromodynamik (196253076) /
                      Nuclear Lattice Simulations $(jara0015_20200501)$},
      pid          = {G:(DE-HGF)POF3-511 / G:(GEPRIS)196253076 /
                      $G:(DE-Juel1)jara0015_20200501$},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000522277200005},
      doi          = {10.1140/epja/s10050-020-00093-0},
      url          = {https://juser.fz-juelich.de/record/889271},
}