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arXiv:1303.6733
Date: Wed, 27 Mar 2013 03:22:14 GMT   (313kb)

Title: Unambiguous Determination of the Neutrino Mass Hierarchy Using Reactor
  Neutrinos
Authors: Yu-Feng Li, Jun Cao, Yifang Wang, Liang Zhan
Categories: hep-ex hep-ph
Comments: 14 pages, 7 figures
\\
  Determination of the neutrino mass hierarchy in a reactor neutrino experiment
at medium baseline is discussed. Observation of the interference effects
between the \Delta m^2_{31} and \Delta m^2_{32} oscillations enables a relative
measurement independent of the knowledge of the absolute mass-squared
difference. With a 20 kton liquid scintillator detector of 3%/\sqrt{E(MeV)}
energy resolution, the Daya Bay II Experiment at a baseline of \sim 50 km from
reactors of total thermal power 36 GW can determine the mass hierarchy at a
confidence level of \Delta \chi^2_{MH} \sim (10-12) (3-3.5 \sigma) in 6 years
after taking into account the real spatial distribution of reactor cores. We
show that the unknown residual energy non-linearity of the liquid scintillator
detector has limited impact on the sensitivity due to the self-calibration of
small oscillation peaks. Furthermore, an extra increase of \Delta \chi^2_{MH}
\simeq 4(9) can be obtained, by including the precise measurement of the
effective mass-squared difference \Delta m^2_{\mu\mu} of expected relative
error 1.5% (1%) from ongoing long-baseline muon neutrino disappearance
experiments. The sensitivities from the interference and from absolute
measurements can be cross checked. When combining these two, the mass hierarchy
can be determined at a confidence level of \Delta \chi^2_{MH} \sim (15-20) (4
\sigma) in 6 years.
\\ ( http://arxiv.org/abs/1303.6733 ,  313kb)
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arXiv:1303.6861
Date: Wed, 27 Mar 2013 15:35:43 GMT   (195kb,D)

Title: Study of B0 -> D*- pi+ pi- pi+ and B0 -> D*- K+ pi- pi+ decays
Authors: LHCb collaboration: R. Aaij, C. Abellan Beteta, A. Adametz, B. Adeva,
  M. Adinolfi, C. Adrover, A. Affolder, Z. Ajaltouni, J. Albrecht, F. Alessio,
  M. Alexander, S. Ali, G. Alkhazov, P. Alvarez Cartelle, A.A. Alves Jr, S.
  Amato, Y. Amhis, L. Anderlini, J. Anderson, R. Andreassen, R.B. Appleby, O.
  Aquines Gutierrez, F. Archilli, A. Artamonov, M. Artuso, E. Aslanides, G.
  Auriemma, S. Bachmann, J.J. Back, C. Baesso, V. Balagura, W. Baldini, R.J.
  Barlow, C. Barschel, S. Barsuk, W. Barter, Th. Bauer, A. Bay, J. Beddow, I.
  Bediaga, S. Belogurov, K. Belous, I. Belyaev, E. Ben-Haim, M. Benayoun, G.
  Bencivenni, S. Benson, J. Benton, A. Berezhnoy, R. Bernet, M.-O. Bettler, M.
  van Beuzekom, A. Bien, S. Bifani, T. Bird, A. Bizzeti, P.M. Bj\ornstad, T.
  Blake, F. Blanc, C. Blanks, J. Blouw, S. Blusk, A. Bobrov, et al. (558
  additional authors not shown)
Categories: hep-ex
Comments: 12 pages, 2 figures
Report-no: LHCb-PAPER-2012-046, CERN-EP-PH-2013-041
\\
  Using proton-proton collision data collected by the LHCb experiment at
sqrt(s) = 7 TeV, corresponding to an integrated luminosity of 1.0 fb^{-1}, the
ratio of branching fractions of the B0 -> D*- pi+ pi- pi+ decay relative to the
B0 -> D*- pi+ decay is measured to be B(B0 -> D*- pi+ pi- pi+) / B(B0 -> D*-
pi+) = 2.64 \pm 0.04 (stat.) \pm 0.13 (syst.). The Cabibbo-suppressed decay B0
-> D*- K+ pi- pi+ is observed for the first time and the measured ratio of
branching fractions is B(B0 -> D*- K+ pi- pi+) / B(B0 -> D*- pi+ pi- pi+) =
(6.47 \pm 0.37 (stat.) \pm 0.35 (syst.)) x 10^{-2}. A search for orbital
excitations of charm mesons contributing to the B0 -> D*- pi+ pi- pi+ final
state is also performed, and the first observation of the B0 ->
Dbar_{1}(2420)^0 pi+ pi- decay is reported with the ratio of branching
fractions B(B0 -> (Dbar_{1}(2420)^0 -> D*- pi+) pi- pi+) / B(B0 -> D*- pi+ pi-
pi+) = (2.04 \pm 0.42 (stat.) \pm 0.22 (syst.)) x 10^{-2}, where the numerator
represents a product of the branching fractions B(B0 -> Dbar_{1}(2420)^0 pi-
pi+) and B(Dbar_{1}(2420)^0 -> D*- pi+).
\\ ( http://arxiv.org/abs/1303.6861 ,  195kb)
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arXiv:1303.6355 (*cross-listing*)
Date: Tue, 26 Mar 2013 00:31:36 GMT   (118kb)

Title: Decoding the riddle of Y(4260) and $Z_c(3900)$
Authors: Qian Wang, Christoph Hanhart, Qiang Zhao
Categories: hep-ph hep-ex nucl-ex nucl-th
Comments: Revtex, 5 pages, 3 eps figures
\\
  The observation of $Z_c(3900)$ by the BESIII collaboration in the invariant
mass spectrum of $J/\psi\pi^\pm$ in $e^+e^-\to J/\psi\pi^+\pi^-$ at the center
of mass 4.260 GeV suggests the existence of a charged $\bar D D^*+D\bar D^*$
molecular state with $I(J^P)=1(1^+)$, which could be an isovector brother of
the famous X(3872) and an analogue of $Z_b(10610)$ claimed by the Belle
Collaboration. We demonstrate that this observation provides strong evidence
that the mysterious Y(4260) is a $\bar{D}D_1(2420) +D\bar{D}_1(2420)$ molecular
state. Especially, we show that the decay of this molecule naturally populates
low momentum $\bar DD^*$ pairs and leads unavoidably to a cusp at the $\bar
DD^*$ threshold. We discuss the signatures that distinguish such a $\bar DD^*$
cusp from the presence of a true resonance.
\\ ( http://arxiv.org/abs/1303.6355 ,  118kb)
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arXiv:1303.6636 (*cross-listing*)
Date: Tue, 26 Mar 2013 20:00:02 GMT   (549kb,D)

Title: Scale-invariant resonance tagging in multijet events and new physics in
  Higgs pair production
Authors: Maxime Gouzevitch, Alexandra Oliveira, Juan Rojo, Rogerio Rosenfeld,
  Gavin Salam, Veronica Sanz
Categories: hep-ph hep-ex
Comments: 38 pages, 17 figures
Report-no: CERN-PH-TH/2012-311, ICTP-SAIFR/2013-003
\\
  We study resonant pair production of heavy particles in fully hadronic final
states by means of jet substructure techniques. We propose a new resonance
tagging strategy that smoothly interpolates between the highly boosted and
fully resolved regimes, leading to uniform signal efficiencies and background
rejection rates across a broad range of masses. Our method makes it possible to
efficiently replace independent experimental searches, based on different final
state topologies, with a single common analysis. As a case study, we apply our
technique to pair production of Higgs bosons decaying into $b\bar{b}$ pairs in
generic New Physics scenarios. We adopt as benchmark models radion and massive
KK graviton production in warped extra dimensions. We find that despite the
overwhelming QCD background, the $4b$ final state has enough sensitivity to
provide a complementary handle in searches for enhanced Higgs pair production
at the LHC.
\\ ( http://arxiv.org/abs/1303.6636 ,  549kb)
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arXiv:1303.6637 (*cross-listing*)
Date: Tue, 26 Mar 2013 20:00:03 GMT   (457kb,D)

Title: Calculating Track-Based Observables for the LHC
Authors: Hsi-Ming Chang, Massimiliano Procura, Jesse Thaler, Wouter J.
  Waalewijn
Categories: hep-ph hep-ex nucl-th
Comments: 5 pages, 5 figures
Report-no: MIT--CTP 4449
\\
  By using observables that only depend on charged particles (tracks), one can
efficiently suppress pile-up contamination at the LHC. Such measurements are
not infrared safe in perturbation theory, so any calculation of track-based
observables must account for hadronization effects. We develop a formalism to
perform these calculations in QCD, by matching partonic cross sections onto new
non-perturbative objects called track functions which absorb infrared
divergences. The track function T_i(x) describes the energy fraction x of a
hard parton i which is converted into charged hadrons. We give a
field-theoretic definition of the track function and derive its renormalization
group evolution, which is in excellent agreement with the Pythia parton shower.
We then perform a next-to-leading order calculation of the total energy
fraction of charged particles in e+ e- -> hadrons. To demonstrate the
implications of our framework for the LHC, we match the Pythia parton shower
onto a set of track functions to describe the track mass distribution in Higgs
plus one jet events. We also show how to reduce smearing due to hadronization
fluctuations by measuring dimensionless track-based ratios.
\\ ( http://arxiv.org/abs/1303.6637 ,  457kb)
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arXiv:1303.6638 (*cross-listing*)
Date: Tue, 26 Mar 2013 20:00:06 GMT   (258kb)

Title: Probing dark matter couplings to top and bottom at the LHC
Authors: Tongyan Lin, Edward W. Kolb, Lian-Tao Wang
Categories: hep-ph hep-ex
\\
  Monojet searches are a powerful way to place model-independent constraints on
effective operators coupling dark matter to the standard model. For operators
generated by the exchange of a scalar mediator, however, couplings to light
quarks are suppressed and the prospect of probing such interactions through the
inclusive monojet channel at the LHC is limited. We propose dedicated searches,
focusing on bottom and top quark final states, to constrain this class of
operators. We show that a search in mono b-jets can significantly improve
current limits. The mono-b signal arises partly from direct production of
b-quarks in association with dark matter, but the dominant component is from
top quark pair production in the kinematic regime where one top is boosted. A
search for tops plus missing energy can strengthen the bounds even more; in
this case signal and background have very different missing energy
distributions. We find an overall improvement by several orders of magnitude in
the bound on the direct detection cross section for scalar or pseudoscalar
couplings.
\\ ( http://arxiv.org/abs/1303.6638 ,  258kb)
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arXiv:1303.6677 (*cross-listing*)
Date: Tue, 26 Mar 2013 21:54:49 GMT   (1146kb,D)

Title: GiBUU and Shallow Inelastic Scattering
Authors: O. Lalakulich and U. Mosel
Categories: nucl-th hep-ex hep-ph nucl-ex
Comments: Proceedings of NuInt12 conference, 11 pages, 14 figures
\\
  In this talk we shortly describe the physics contents of the GiBUU transport
code, used to describe lepton scattering off nuclei. Particular attention will
be given to validation of the GiBUU in pion-, electron- and photon-induced
reactions, which serve as a benchmark for neutrino-induced ones. We mainly
concentrate on those properties of benchmark reactions, which are relevant to
the region of Shallow Inelastic Scattering (SIS). Our results in this region
are presented for integrated and differential cross sections. Comparison with
recent MINOS inclusive data, as well as predictions for the differential cross
sections measurable in \Minerva and \Nova experiments are made.
\\ ( http://arxiv.org/abs/1303.6677 ,  1146kb)
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arXiv:1303.6685 (*cross-listing*)
Date: Tue, 26 Mar 2013 22:28:26 GMT   (1954kb)

Title: Brane SUSY Breaking and Inflation: Implications for Scalar Fields and
  CMB Distorsion
Authors: A. Sagnotti (Scuola Normale Superiore and INFN, Pisa, ITALY)
Categories: hep-th gr-qc hep-ex hep-ph
Comments: 9 pages, 4 figures, talk presented at Rencontres de Moriond EW2013,
  La Thuile, March 2 - 9 2013
\\
  I elaborate on a link between the string--scale breaking of supersymmetry
that occurs in a class of superstring models and the onset of inflation. The
link rests on spatially flat cosmologies supported by a scalar field driven by
an exponential potential. If, as in String Theory, this potential is steep
enough, under some assumptions that are spelled out in the text the scalar can
only climb up as it emerges from an initial singularity. In the presence of
another mild exponential, slow--roll inflation is thus injected during the
ensuing descent and definite imprints are left in the CMB power spectrum: the
quadrupole is systematically reduced and, depending on the choice of two
parameters, an oscillatory behavior can also emerge for low multipoles l < 50,
in qualitative agreement with WMAP9 and PLANCK data.
\\ ( http://arxiv.org/abs/1303.6685 ,  1954kb)
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arXiv:1303.6731 (*cross-listing*)
Date: Wed, 27 Mar 2013 02:57:31 GMT   (555kb)

Title: Low beta spoke cavity multipacting analysis
Authors: Xu Bo, Li Han, Zhang Juan, Sha Peng, Wang Qunyao, Lin Haiying, Huang
  Hong, Dai Jianping, Sun Yi, Wang Guangwei, Pan Weimin
Categories: physics.acc-ph hep-ex
\\
  The simulation and analysis for electron multipacting phenomenon in low
{\beta} spoke superconducting cavity in ADS proton accelerator are proposed.
Using both CST and Track3P codes, the electron multipacting calculation for
{\beta} = 0.12 spoke superconducting cavity is implemented. The methods of
multipacting calculation on both codes are studied and described. With the
comparison between the calculation results and the cavity vertical test
results, the accuracy and reliability of different code on calculating
multipacting are analyzed. Multipacting calculation can help to understand the
result of vertical test and also can help to do the optimation in cavity
design.
\\ ( http://arxiv.org/abs/1303.6731 ,  555kb)
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arXiv:1303.6842 (*cross-listing*)
Date: Wed, 27 Mar 2013 14:39:13 GMT   (141kb)

Title: Predictions of charged charmonium-like structures with hidden-charm and
  open-strange channel
Authors: Dian-Yong Chen, Xiang Liu and Takayuki Matsuki
Categories: hep-ph hep-ex nucl-th
Comments: 5 pages, 3 figures
\\
  We propose the initial single chiral particle emission (ISChE) mechanism,
with which the hidden-charm di-kaon decays of higher charmonia and
charmonium-like states are studied. Calculating the distributions of
differential decay width, we obtain the line shape of the $J/\psi K^+$
invariant mass spectrum of $\psi_i\to J/\psi K^+K^-$, where $\psi_i=\psi(4415),
Y(4660)$, and $\psi(4790)$. Our numerical results show that there exist
enhancement structures with both hidden-charm and open-strange, which are near
the $D_s\bar{D}^*/\bar{D}_s^*D$ and $D^*\bar{D}_s^*/\bar{D}^*D_s^*$ thresholds.
These charged charmonium-like structures predicted in this paper can be
accessible at future experiment, especially BESIII, BelleII and SuperB.
\\ ( http://arxiv.org/abs/1303.6842 ,  141kb)
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arXiv:1303.6912 (*cross-listing*)
Date: Wed, 27 Mar 2013 17:49:15 GMT   (2970kb)

Title: News on Right Handed Neutrinos
Authors: Marco Drewes
Categories: hep-ph astro-ph.CO hep-ex
Comments: 44 pages, 14 figures
Report-no: TUM-HEP-881/13
\\
  Neutrinos are the only particles in the Standard Model of particle physics
that have only been observed with left handed chirality to date. If right
handed neutrinos exist, they could be responsible for several phenomena that
have no explanation within the Standard Model, including neutrino oscillations,
the baryon asymmetry of the universe, dark matter and dark radiation. After a
pedagogical introduction, we review recent progress in the phenomenology of
right handed neutrinos. We in particular discuss the mass ranges suggested by
hints for neutrino oscillation anomalies and dark radiation (eV), sterile
neutrino dark matter scenarios (keV) and experimentally testable theories of
baryogenesis (GeV to TeV). We summarize constraints from theoretical
considerations, laboratory experiments, astrophysics and cosmology for each of
these.
\\ ( http://arxiv.org/abs/1303.6912 ,  2970kb)
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arXiv:1303.6918 (*cross-listing*)
Date: Wed, 27 Mar 2013 18:12:41 GMT   (1186kb,D)

Title: Post-Sphaleron Baryogenesis and an Upper Limit on the
  Neutron-Antineutron Oscillation Time
Authors: K.S. Babu, P.S. Bhupal Dev, Elaine C.F.S. Fortes and R.N. Mohapatra
Categories: hep-ph hep-ex
Comments: 20 pages, 2 tables, 8 figures
Report-no: OSU-HEP-13-02, MAN/HEP/2012/017, UMD-PP-013-003
\\
  A new scenario for baryogenesis has been proposed wherein the baryon
asymmetry of the universe is produced below the electroweak phase transition
temperature after the sphaleron processes have gone out of equilibrium. This
mechanism, termed post-sphaleron baryogenesis (PSB), arises naturally in
quark-lepton unified models based on the gauge symmetry SU(2)_L x SU(2)_R x
SU(4)_c realized in the multi-TeV scale. These models embed naturally the
seesaw mechanism for neutrino masses, and predict color-sextet scalar particles
in the TeV range which may be accessible to the LHC experiments. A necessary
consequence of this scenario is the baryon number violating \Delta B=2 process
of neutron-antineutron (n-\bar{n}) oscillations. In this paper we show that the
constraints of PSB, when combined with the neutrino oscillation data and
restrictions from flavor changing neutral currents mediated by the colored
scalars imply an upper limit on the n-\bar{n} oscillation time of 5 x 10^{10}
sec. regardless of the quark-lepton unification scale. If this scale is
relatively low, in the (200-250) TeV range, \tau_{n-\bar{n}} is predicted to be
less than 10^{10} sec., which is accessible to the next generation of proposed
experiments.
\\ ( http://arxiv.org/abs/1303.6918 ,  1186kb)
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arXiv:1303.6928 (*cross-listing*)
Date: Wed, 27 Mar 2013 19:07:37 GMT   (688kb,D)

Title: Updated S3 Model of Quarks
Authors: Ernest Ma, Blazenka Melic
Categories: hep-ph hep-ex
Comments: 14 pages, 2 figures
Report-no: UCRHEP-T526
\\
  A model proposed in 2004 using the non-Abelian discrete symmetry S3 for
understanding the flavor structure of quarks and leptons is updated, with
special focus on the quark and scalar sectors. We show how the approximate
residual symmetries of this model explain both the pattern of the quark mixing
matrix and why the recently observed particle of 126 GeV at the Large Hadron
Collider is so much like the one Higgs boson of the Standard Model. We identify
the strongest phenomenological bounds on the scalar masses of this model, and
predict a possibly observable decay b -> s tau- mu+, but not b -> s tau+ mu-.
\\ ( http://arxiv.org/abs/1303.6928 ,  688kb)
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arXiv:1112.5675 (*cross-listing*)
replaced with revised version Wed, 27 Mar 2013 17:28:42 GMT   (16kb)

Title: Top++: a program for the calculation of the top-pair cross-section at
  hadron colliders
Authors: Michal Czakon and Alexander Mitov
Categories: hep-ph hep-ex
Comments: v2.0: Major update: includes full NNLO result; functionality updates.
  Program webpage: http://www.alexandermitov.com/software
\\ ( http://arxiv.org/abs/1112.5675 ,  16kb)
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arXiv:1206.4142
replaced with revised version Wed, 27 Mar 2013 09:21:51 GMT   (120kb)

Title: Search for solar axions produced by Compton process and bremsstrahlung
  using axioelectric effect
Authors: A. V. Derbin, I. S. Drachnev, A. S. Kayunov, V. N. Muratova
Categories: hep-ex hep-ph
Comments: 6 pages, 6 figures, corrected typo in fig.1
Journal-ref: JETP Lett., 95, 379 (2012)
\\ ( http://arxiv.org/abs/1206.4142 ,  120kb)
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arXiv:1211.1980 (*cross-listing*)
replaced with revised version Tue, 26 Mar 2013 21:15:10 GMT   (1825kb)

Title: Higgs CP Properties From Early LHC Data
Authors: Ayres Freitas, Pedro Schwaller
Categories: hep-ph hep-ex
Comments: 18 pages, 5 figures; v2: references added and minor typos fixed
Report-no: ANL-HEP-PR-12-84
Journal-ref: Phys. Rev. D 87, 055014 (2013)
DOI: 10.1103/PhysRevD.87.055014
\\ ( http://arxiv.org/abs/1211.1980 ,  1825kb)
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arXiv:1211.1981 (*cross-listing*)
replaced with revised version Tue, 26 Mar 2013 21:08:58 GMT   (3040kb,D)

Title: More Energy, More Searches, but the pMSSM Lives On
Authors: Matthew W. Cahill-Rowley, JoAnne L. Hewett, Ahmed Ismail, and Thomas
  G. Rizzo
Categories: hep-ph hep-ex
Comments: 33 pages, 9 figures
Report-no: SLAC-PUB-15273
\\ ( http://arxiv.org/abs/1211.1981 ,  3040kb)
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arXiv:1212.0648 (*cross-listing*)
replaced with revised version Wed, 27 Mar 2013 16:20:08 GMT   (132kb,D)

Title: X(3872) is not a true molecule
Authors: Susana Coito, George Rupp, Eef van Beveren
Categories: hep-ph hep-ex nucl-th
Comments: Revtex4, 10 pages, 4 figures, 8 plots, 7 tables; v2: SVJour Document
  Class, a few extra references, several typos and other minor imprecisions
  corrected, version accepted for publication in Eur. Phys. J. C
\\ ( http://arxiv.org/abs/1212.0648 ,  132kb)
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arXiv:1212.6541 (*cross-listing*)
replaced with revised version Wed, 27 Mar 2013 19:53:19 GMT   (28kb)

Title: Nuclear modification of vector boson production in proton-lead
  collisions at the LHC
Authors: Zhong-Bo Kang, Jian-Wei Qiu
Categories: hep-ph hep-ex nucl-ex nucl-th
Comments: 9 pages, 5 figures, minor modification, version to appear in PLB
DOI: 10.1016/j.physletb.2013.03.030
\\ ( http://arxiv.org/abs/1212.6541 ,  28kb)
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