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Measurements using the inelasticity distribution of multi-TeV neutrino interactions in IceCube

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Abstract
Inelasticity, the fraction of a neutrino's energy transferred to hadrons, is a quantity of interest in the study of astrophysical and atmospheric neutrino interactions at multi-TeV energies with IceCube. In this work, a sample of contained neutrino interactions in IceCube is obtained from five years of data and classified as 2650 tracks and 965 cascades. Tracks arise predominantly from charged-current nu(mu) interactions, and we demonstrate that we can reconstruct their energy and inelasticity. The inelasticity distribution is found to be consistent with the calculation of Cooper-Sarkar et al. across the energy range from similar to 1 to similar to 100 TeV. Along with cascades from neutrinos of all flavors, we also perform a fit over the energy, zenith angle, and inelasticity distribution to characterize the flux of astrophysical and atmospheric neutrinos. The energy spectrum of diffuse astrophysical neutrinos is described well by a power law in both track and cascade samples, and a best-fit index gamma = 2.62 +/- 0.07 is found in the energy range from 3.5 TeV to 2.6 PeV. Limits are set on the astrophysical flavor composition and are compatible with a ratio of (1/3 : 1/3 : 1/3)(circle plus). Exploiting the distinct inelasticity distribution of nu(mu) and (nu) over bar (mu) interactions, the atmospheric nu(mu) to (nu) over bar (mu) flux ratio in the energy range from 770 GeV to 21 TeV is found to be 0.77(-0.25)(+0.44) times the calculation by Honda et al. Lastly, the inelasticity distribution is also sensitive to neutrino charged-current charm production. The data are consistent with a leading-order calculation, with zero charm production excluded at 91% confidence level. Future analyses of inelasticity distributions may probe new physics that affects neutrino interactions both in and beyond the Standard Model.
Keywords
PROPAGATION, PERFORMANCE, ICE

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Chicago
Aartsen, M. G., M. Ackermann, J. Adams, J. A. Aguilar, M. Ahlers, M. Ahrens, I. Al Samarai, et al. 2019. “Measurements Using the Inelasticity Distribution of multi-TeV Neutrino Interactions in IceCube.” Physical Review D 99 (3).
APA
Aartsen, M. G., Ackermann, M., Adams, J., Aguilar, J. A., Ahlers, M., Ahrens, M., Al Samarai, I., et al. (2019). Measurements using the inelasticity distribution of multi-TeV neutrino interactions in IceCube. PHYSICAL REVIEW D, 99(3).
Vancouver
1.
Aartsen MG, Ackermann M, Adams J, Aguilar JA, Ahlers M, Ahrens M, et al. Measurements using the inelasticity distribution of multi-TeV neutrino interactions in IceCube. PHYSICAL REVIEW D. 2019;99(3).
MLA
Aartsen, M. G. et al. “Measurements Using the Inelasticity Distribution of multi-TeV Neutrino Interactions in IceCube.” PHYSICAL REVIEW D 99.3 (2019): n. pag. Print.
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  abstract     = {Inelasticity, the fraction of a neutrino's energy transferred to hadrons, is a quantity of interest in the study of astrophysical and atmospheric neutrino interactions at multi-TeV energies with IceCube. In this work, a sample of contained neutrino interactions in IceCube is obtained from five years of data and classified as 2650 tracks and 965 cascades. Tracks arise predominantly from charged-current nu(mu) interactions, and we demonstrate that we can reconstruct their energy and inelasticity. The inelasticity distribution is found to be consistent with the calculation of Cooper-Sarkar et al. across the energy range from similar to 1 to similar to 100 TeV. Along with cascades from neutrinos of all flavors, we also perform a fit over the energy, zenith angle, and inelasticity distribution to characterize the flux of astrophysical and atmospheric neutrinos. The energy spectrum of diffuse astrophysical neutrinos is described well by a power law in both track and cascade samples, and a best-fit index gamma = 2.62 +/- 0.07 is found in the energy range from 3.5 TeV to 2.6 PeV. Limits are set on the astrophysical flavor composition and are compatible with a ratio of (1/3 : 1/3 : 1/3)(circle plus). Exploiting the distinct inelasticity distribution of nu(mu) and (nu) over bar (mu) interactions, the atmospheric nu(mu) to (nu) over bar (mu) flux ratio in the energy range from 770 GeV to 21 TeV is found to be 0.77(-0.25)(+0.44) times the calculation by Honda et al. Lastly, the inelasticity distribution is also sensitive to neutrino charged-current charm production. The data are consistent with a leading-order calculation, with zero charm production excluded at 91% confidence level. Future analyses of inelasticity distributions may probe new physics that affects neutrino interactions both in and beyond the Standard Model.},
  articleno    = {032004},
  author       = {Aartsen, M. G. and Ackermann, M. and Adams, J. and Aguilar, J. A. and Ahlers, M. and Ahrens, M. and Al Samarai, I. and Altmann, D. and Andeen, K. and Anderson, T. and Ansseau, I. and Anton, G. and Arguelles, C. and Auffenberg, J. and Axani, S. and Backes, P. and Bagherpour, H. and Bai, X. and Barbano, A. and Barron, J. P. and Barwick, S. W. and Baum, V. and Bay, R. and Beatty, J. J. and Tjus, J. Becker and Becker, K. -H. and BenZvi, S. and Berley, D. and Bernardini, E. and Besson, D. Z. and Binder, G. and Bindig, D. and Blaufuss, E. and Blot, S. and Bohm, C. and Boerner, M. and Bos, F. and Boeser, S. and Botner, O. and Bourbeau, E. and Bourbeau, J. and Bradascio, F. and Braun, J. and Brenzke, M. and Bretz, H. -P. and Bron, S. and Brostean-Kaiser, J. and Burgman, A. and Busse, R. S. and Carver, T. and Cheung, E. and Chirkin, D. and Clark, K. and Classen, L. and Collin, G. H. and Conrad, J. M. and Coppin, P. and Correa, P. and Cowen, D. 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N. and Tonnis, C. and Toscano, S. and Tosi, D. and Tselengidou, M. and Tung, C. F. and Turcati, A. and Turley, C. F. and Ty, B. and Unger, E. and Elorrieta, M. A. Unland and Usner, M. and Vandenbroucke, J. and Van Driessche, Ward and van Eijk, D. and van Eijndhoven, N. and Vanheule, Sander and van Santen, J. and Vraeghe, Matthias and Walck, C. and Wallace, A. and Wallraff, M. and Wandler, F. D. and Wandkowsky, N. and Watson, T. B. and Waza, A. and Weaver, C. and Weiss, M. J. and Wendt, C. and Werthebach, J. and Westerhoff, S. and Whelan, B. J. and Whitehorn, N. and Wiebe, K. and Wiebusch, C. H. and Wille, L. and Williams, D. R. and Wills, L. and Wolf, M. and Wood, J. and Wood, T. R. and Woolsey, E. and Woschnagg, K. and Wrede, G. and Xu, D. L. and Xu, X. W. and Xu, Y. and Yanez, J. P. and Yodh, G. and Yoshida, S. and Yuan, T.},
  issn         = {2470-0010},
  journal      = {PHYSICAL REVIEW D},
  keywords     = {PROPAGATION,PERFORMANCE,ICE},
  language     = {eng},
  number       = {3},
  pages        = {20},
  title        = {Measurements using the inelasticity distribution of multi-TeV neutrino interactions in IceCube},
  url          = {http://dx.doi.org/10.1103/PhysRevD.99.032004},
  volume       = {99},
  year         = {2019},
}

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