Fri·Jun 24, 2016Friday·June 24, 2016

1. 01*

   Jet substructure using semi-inclusive jet functions within SCET

   Zhong-Bo Kang🇺🇸 · Felix Ringer🇺🇸 · Ivan Vitev🇺🇸

   We propose a new method to evaluate jet substructure observables in inclusive jet measurements, based upon semi-inclusive jet functions in the framework of Soft Collinear Effective Theory (SCET). As a first example, we consider the jet fragmentation function, where a hadron $h$ is identified inside a fully reconstructed jet. We introduce a new semi-inclusive fragmenting jet function ${\mathcal{G}}_i^h(z={\omega }_J/\omega ,z_h={\omega }_h/{\omega }_J,{\omega }_J,R,\mu )$, which depends on the jet radius $R$ and the large light-cone momenta of the parton `$i$' initiating the jet ($\omega$), the jet (${\omega }_J$), and the hadron $h$ (${\omega }_h$). The jet fragmentation function can then be expressed as a semi-inclusive observable, in the spirit of actual experimental measurements, rather than as an exclusive one. We demonstrate the consistency of the effective field theory treatment and standard perturbative QCD calculations of this observable at next-to-leading order (NLO). The renormalization group (RG) equation for the semi-inclusive fragmenting jet function ${\mathcal{G}}_i^h(z,z_h,{\omega }_J,R,\mu )$ are also derived and shown to follow exactly the usual timelike DGLAP evolution equations for fragmentation functions. The newly obtained RG equations can be used to perform the resummation of single logarithms of the jet radius parameter $R$ up to next-to-leading logarithmic (NLL${}_R$) accuracy. In combination with the fixed NLO calculation, we obtain NLO+NLL${}_R$ results for the hadron distribution inside the jet. We present numerical results for $pp\to (\mathrm{jet}h)X$ in the new framework, and find excellent agreement with existing LHC experimental data.

   ↳ hep-phhep-exnucl-exnucl-thJHEP(2016)·113 citations
2. 02*

   Search for electron antineutrinos associated with gravitational wave events GW150914 and GW151226 using KamLAND

   KamLAND Collaboration: A. Gando🇯🇵 · Y. Gando🇯🇵 · T. Hachiya🇯🇵 · A. Hayashi🇯🇵 · S. Hayashida🇯🇵 · H. Ikeda🇯🇵 · K. Inoue🇯🇵 · K. Ishidoshiro🇯🇵 · Y. Karino🇯🇵 · M. Koga🇯🇵 · S. Matsuda🇯🇵 · T. Mitsui🇯🇵 and 35 other authors

   We present a search for low energy antineutrino events coincident with the gravitational wave events GW150914 and GW151226, and the candidate event LVT151012 using KamLAND, a kiloton-scale antineutrino detector. We find no inverse beta-decay neutrino events within $\pm 500$ seconds of either gravitational wave signal. This non-detection is used to constrain the electron antineutrino fluence and the luminosity of the astrophysical sources.

   ↳ astro-ph.HEhep-exnucl-exApJL(2016)·33 citations
3. 03*

   The true quantum face of the "exponential" decay law

   K. Urbanowski🇵🇱

   Results of theoretical studies of the quantum unstable systems caused that there are rather widespread belief that a universal feature od the quantum decay process is the presence of three time regimes of the decay process: the early time (initial) leading to the Quantum Zeno (or Anti Zeno) Effects, "exponential" (or "canonical") described by the decay law of the exponential form, and late time characterized by the decay law having inverse--power law form. Based on the fundamental principles of the quantum theory we give the proof that there is no time interval in which the survival probability (decay law) could be a decreasing function of time of the purely exponential form but even at the "exponential" regime the decay curve is oscillatory modulated with a smaller or a large amplitude of oscillations depending on parameters of the model considered.

   ↳ quant-phhep-exhep-phnucl-exEur.Phys.J.D(2017)·13 citations
4. 04*

   Ultracold neutron detection with 6Li-doped glass scintillators, NANOSC: a fast ultracold neutron detector for the nEDM experiment at the Paul Scherrer Institute

   G. Ban🇫🇷 · G. Bison🇨🇭 · K. Bodek🇵🇱 · Z. Chowdhuri🇨🇭 · P. Geltenbort🇫🇷 · W.C. Griffith🇬🇧 · V. Hélaine🇨🇭 · R. Henneck🇨🇭 · M. Kasprzak🇧🇪 · Y. Kermaidic🇫🇷 · K. Kirch🇨🇭 · S. Komposch🇨🇭 and 23 other authors

   This paper summarizes the results from measurements aiming to characterize ultracold neutron detection with 6Li-doped glass scintillators. Single GS10 or GS20 scintillators, with a thickness of 100-200 micrometer, fulfill the ultracold neutron detection requirements with an acceptable neutron-gamma discrimination. This discrimination is clearly improved with a stack of two scintillators: a 6Li-depleted glass bonded to a 6Li-enriched glass. The optical contact bonding is used between the scintillators in order to obtain a perfect optical contact. The scintillator's detection efficiency is similar to that of a 3He Strelkov gas detector. Coupled to a digital data acquisition system, counting rates up to a few 10^5 counts/s can be handled. A detector based on such a scintillator stack arrangement was built and has been used in the neutron electric dipole moment experiment at the Paul Scherrer Institute since 2010. Its response for the regular runs of the neutron electric dipole moment experiment is presented.

   ↳ physics.ins-detnucl-exEPJA(2016)·29 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.