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3.0
Jun 28, 2018
06/18
by
E. Iancu; J. D. Madrigal; A. H. Mueller; G. Soyez; D. N. Triantafyllopoulos
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Linear and non-linear QCD evolutions at high energy suffer from severe issues related to convergence, due to higher order corrections enhanced by large double and single transverse logarithms. We resum double logarithms to all orders by taking into account successive soft gluon emissions strongly ordered in lifetime. We further resum single logarithms generated by the first non-singular part of the splitting functions and by the one-loop running of the coupling. The resulting collinearly...
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1509.08214
5
5.0
Jun 28, 2018
06/18
by
Kristopher J. Healey
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In these proceedings for CIPANP2015 we present a brief overview of the current status of the theoretical approaches used by our group for the extraction of $|V_{cb}|$ and $|V_{ub}|$ through inclusive semi-leptonic $B$ decays. We discuss the calculations and implications of the recent perturbative corrections to power-suppressed contributions for $|V_{cb}|$, and present an overview of the major sources of theoretical uncertainty for $|V_{ub}|$.
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1509.08782
3
3.0
Jun 28, 2018
06/18
by
Y. Feng; J. -X. Wang
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Using nonrelativistic QCD (NRQCD) factorization, we calculate the yields for $J/\psi$, $\psi(2S)$ and $\Upsilon(1S)$ hadroproduction at $\sqrt{s}=$ 72 GeV and 115 GeV including the next-to-leading order QCD corrections. Both these center-of-mass energies correspond to those obtained with 7~TeV and 2.76~TeV nucleon beam impinging a fixed target. We study the cross section integrated in $p_t$ as a function of the rapidity as well as the $p_t$ differential cross section in the central rapidity...
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1510.05277
6
6.0
Jun 28, 2018
06/18
by
Alexander Belyaev; Veronica Sanz; Marc Thomas
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Understanding the extent to which experimental searches are sensitive to Light Stops (LST) scenarios is essential to resolve questions about naturalness, electroweak baryogenesis and Dark Matter. In this paper we characterize the reach on LST scenarios in two ways. We extend experimental searches to cover specific gaps in the LST parameter space, showing for the first time that assuming a single decay channel one can exclude the region of $m_{\tilde{t}}
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1510.07688
3
3.0
Jun 28, 2018
06/18
by
Thomas Wolkanowski; Milena Soltysiak; Francesco Giacosa
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We study the light scalar sector up to $1.8$ GeV by using a quantum field theoretical approach which includes a single kaonic state in a Lagrangian with both derivative and non-derivative interactions. By performing a fit to $\pi K$ phase shift data in the $I=1/2,$ $J=0$ channel, we show that $K_{0}^{\ast}(800)$ (or $\kappa$) emerges as a dynamically generated companion pole of $K_{0}^{\ast }(1430)$. This is a result of investigating quantum fluctuations with one kaon and one pion circulating...
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1512.01071
3
3.0
Jun 28, 2018
06/18
by
Oleksii Matsedonskyi; Giuliano Panico; Andrea Wulzer
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Colored fermionic partners of the top quark are well-known signatures of the Composite Higgs scenario and for this reason they have been and will be subject of an intensive experimental study at the LHC. Performing an assessment of the theoretical implications of this experimental effort is the goal of the present paper. We proceed by analyzing a set of simple benchmark models, characterized by simple two-dimensional parameter spaces where the results of the searches are conveniently visualized...
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1512.04356
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4.0
Jun 28, 2018
06/18
by
Hisaki Hatanaka
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The Higgsless model in warped extra dimension is reexamined. Dirichlet boundary conditions on the TeV brane are replaced with Robin boundary conditions which are parameterized by a mass parameter $M$. We calculate the Peskin-Takeuchi precision parameters $S$, $T$ and $U$ at tree level. We find that to satisfy the constraints on the precision parameters at $99 \%$ [$95 \%$] confidence level (CL) the first Kaluza-Klein excited $Z$ boson, $Z'$, should be heavier than 5 TeV [8 TeV]. The Magnitude...
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1512.06595
3
3.0
Jun 29, 2018
06/18
by
Antony Prakash Monteiro; Manjunath Bhat; K. B. Vijaya Kumar
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The phenomenological relativistic quark model (RQM) has been employed to obtain the masses of ground state pseudo scalar and vector $c\bar{b}$ states. In the frame work of RQM a study of M1 radiative decays of $c\bar{b}$ has been made. The Hamiltonian used in the investigation has confinement potential and confined one gluon exchange potential (COGEP). An overall agreement is obtained with the experimental masses and decay widths. Calculated values are compared with other theoretical models.
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1601.05874
3
3.0
Jun 29, 2018
06/18
by
Rodrigo Alonso; Elizabeth E. Jenkins; Aneesh V. Manohar
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We construct Higgs Effective Field Theory (HEFT) based on the scalar manifold H^n, which is a hyperbolic space of constant negative curvature. The Lagrangian has a non-compact O(n,1) global symmetry group, but it gives a unitary theory as long as only a compact subgroup of the global symmetry is gauged. Whether the HEFT manifold has positive or negative curvature can be tested by measuring the S-parameter, and the cross sections for longitudinal gauge boson and Higgs boson scattering, since the...
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1602.00706
3
3.0
Jun 29, 2018
06/18
by
Da Liu; Alex Pomarol; Riccardo Rattazzi; Francesco Riva
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Even though the Standard Model (SM) is weakly coupled at the Fermi scale, a new strong dynamics involving its degrees of freedom may conceivably lurk at slightly higher energies, in the multi TeV range. Approximate symmetries provide a structurally robust context where, within the low energy description, the dimensionless SM couplings are weak, while the new strong dynamics manifests itself exclusively through higher-derivative interactions. We present an exhaustive classification of such...
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1603.03064
3
3.0
Jun 29, 2018
06/18
by
Martin Bauer; Torben Schell; Tilman Plehn
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The next generation of experiments in particle physics will for the first time systematically test flavor physics models based on flavon fields. Starting from the current quark-flavor constrains on such models we show how the new generation of lepton flavor experiments will dominate indirect searches in the coming decades. A future 100 TeV hadron collider will then be the first experiment to probe flavons as propagating degrees of freedom. Our estimate of the collider reach relies on a proper...
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1603.06950
3
3.0
Jun 29, 2018
06/18
by
Ilkka Helenius; Hannu Paukkunen; Nestor Armesto
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An updated analysis regarding the expected nuclear PDF constraints from the future Large Hadron Electron Collider (LHeC) experiment is presented. The new study is based on a more flexible small-$x$ parametrization which provides less biased uncertainty estimates in the region where there are currently no data constraints. The effect of the LHeC is quantified by directly including a sample of pseudodata according to the expected precision of this planned experiment. As a result, a significant...
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1606.09003
3
3.0
Jun 30, 2018
06/18
by
Alexandre Alves; M. Dias; F. de Campos
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The aim of this work is to explore the possibility to discover a fermionic field with mass dimension one, the Elko field, in the 14 TeV Large Hadron Collider (LHC), in processes with missing energy and one jet. We explore the possibility of a triple coupling with the Higgs field, generating also a contribution to the Elko mass term, and suggest some possibilities for future studies in this field.
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1410.3766
3
3.0
Jun 30, 2018
06/18
by
I. P. Ivanov; C. C. Nishi
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An attractive feature of New Physics models with multiple Higgs fields is that they are equipped with discrete symmetry groups in the Higgs and flavour sectors. These symmetry groups are often broken at the global minimum of the Higgs potential, either completely or to a proper subgroup, with certain phenomenological consequences. Here, we systematically explore these symmetry breaking patterns in the scalar sector of the three-Higgs-doublet model (3HDM). We use the full list of discrete...
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1410.6139
4
4.0
Jun 30, 2018
06/18
by
Mohammad Ahmady; Sébastien Lord; Ruben Sandapen
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Light front Holography is a formalism developed by Brodsky and de T\'{e}ramond in which analytic forms for the hadronic bound state wavefunctions can be obtained. We have used the holographic light front wavefunctions thus obtained in order to calculate the distribution amplitudes of the light vector mesons $\rho$ and $K^*$. As a result, we are able to calculate the form factors for $B\to \rho , K^*$ transitions as well as $\Lambda_{\rm QCD}/m_b$ contributions in radiative $B_{(s)}\to (\rho...
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1410.8552
4
4.0
Jun 30, 2018
06/18
by
Chee Sheng Fong; Hisakazu Minakata; Boris Panes; Renata Zukanovich Funchal
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We discuss possible interpretations of the 37 high energy neutrino events observed by the IceCube experiment in the South Pole. We examine the possibility to explain the observed neutrino spectrum exclusively by the decays of a heavy long-lived particle of mass in the PeV range. We compare this with the standard scenario, namely, a single power-law spectrum related to neutrinos produced by astrophysical sources and a viable hybrid situation where the spectrum is a product of two components: a...
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1411.5318
3
3.0
Jun 30, 2018
06/18
by
S. M. Seif; T. A. Azim
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In this work, the radiative corrections to the production of a light Higgs boson ($h^0$) with a pair of lightest neutralinos (${\tilde{\chi}}_1^0$) in $e^+ e^-$ collisions within MSSM are presented, including the on-shell renormalization scheme in the loop calculations. We have studied the QED corrections as well as the weak corrections, where the contribution from both corrections is significant and needs to be taken into account in the future linear colliders experiments. The result includes...
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1412.0109
5
5.0
Jun 30, 2018
06/18
by
Kassahun Betre; Sonia El Hedri; Devin G. E. Walker
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We place perturbative unitarity constraints on both the dimensionful and dimensionless parameters in the Next-to-Minimal Supersymmetric Standard Model (NMSSM) Higgs Sector. These constraints, plus the requirement that the singlino and/or Higgsino constitutes at least part of the observed dark matter relic abundance, generate upper bounds on the Higgs, neutralino and chargino mass spectrum. Requiring higher order corrections to be no more than 41% of the tree-level value, we obtain an upper...
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1410.1534
5
5.0
Jun 29, 2018
06/18
by
Jorge Henrique Sales; Alfredo Takashi Suzuki; Ronaldo Thibes
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The spin projection of a massive particle onto its direction of motion is called helicity (or "handedness"). It can therefore be positive or negative. When a particle's helicity changes from positive to negative (or vice-versa) due to its interaction with other particles or fields, we say there is a helicity flip. In this work we show that such helicity flip can be seen for an electron of $20 MeV$ of energy interacting with a charged scalar meson through the exchange of a virtual...
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1608.03559
3
3.0
Jun 29, 2018
06/18
by
B. O. Kerbikov; M. A. Andreichikov; Yu. A. Simonov
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Spectra of $q \bar q$ mesons are investigated in the framework of the Hamiltonian obtained from the relativistic path integral in external homogeneous magnetic field. The spectra of all 12 spin-isospin s-wave states generated by $\pi$- and $\rho$-mesons with different spin projections, are studied analytically as functions of the field strength. Three types of behavior with characteristic splittings are found. The results are in agreement with recent lattice calculations.
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1611.10206
3
3.0
Jun 29, 2018
06/18
by
Piotr Lebiedowicz; Otto Nachtmann; Antoni Szczurek
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We consider the $pp \to pp \rho^{0} \pi^{0}$ and $pp \to pn \rho^{0} \pi^{+}$ processes at LHC energies. Our description is based on the nonperturbative framework of tensor pomeron and tensor reggeon exchanges. We discuss the Drell-Hiida-Deck type mechanism with centrally produced $\rho^{0}$ meson associated with a very forward/backward $\pi N$ system. The considered processes constitute an inelastic (non-exclusive) background to the $p p \to p p \rho^0$ reaction in the case when only the...
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1612.06294
4
4.0
Jun 30, 2018
06/18
by
Bengt Friman; Gabor Almasi; Krzysztof Redlich
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We discuss the critical properties of net-baryon-number fluctuations at the chiral restoration transition in matter at nonzero temperature and net-baryon density. The chiral dynamics of quantum chromodynamics (QCD) is modeled by the Polykov-loop extended Quark-Meson Lagrangian, that includes the coupling of quarks to temporal gauge fields. The Functional Renormalization Group is employed to account for the criticality at the phase boundary. We focus on the ratios of the net-baryon-number...
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1703.06896
4
4.0
Jun 30, 2018
06/18
by
Stefan Alte; Yuval Grossman; Matthias König; Matthias Neubert
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We discuss the very rare, exclusive hadronic decays of a Z boson into a meson and a photon. The QCD factorization approach allows to organize the decay amplitude as an expansion in powers of $\Lambda_{\rm QCD}/m_Z\,$, where the leading terms contain convolutions of perturbatively calculable hard functions with the leading-twist light-cone distribution amplitudes of the meson. We find that power corrections to these leading terms are negligible since they are suppressed by the small ratio...
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1703.07242
5
5.0
Jun 30, 2018
06/18
by
Markos Maniatis; Carlos M. Reyes
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We analyze the unitarity of a modified QED with higher-order terms that violate Lorentz symmetry. We make an explicit calculation to verify unitarity at the one-loop level. As expected we find negative norm states that could in principle lead to a violation of unitarity. However, we show that these states become massive in Euclidean space and do not contribute to the discontinuity.
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1401.3752
4
4.0
Jun 30, 2018
06/18
by
Zoltan Nagy; Davison E. Soper
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The parton splittings in a parton shower are ordered according to an ordering variable, for example the transverse momentum of the daughter partons relative to the direction of the mother, the virtuality of the splitting, or the angle between the daughter partons. We analyze the choice of the ordering variable and conclude that one particular choice has the advantage of factoring softer splittings from harder splittings graph by graph in a physical gauge.
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1401.6366
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5.0
Jun 30, 2018
06/18
by
M. F. M. Lutz; D. Samart; Y. Yan
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The chiral $SU(3)$ Lagrangian with charmed baryons of spin $J^P=1/2^+$ and $J^P=3/2^+$ is analyzed. We consider all counter terms that are relevant at next-to-next-to-next-to-leading order (N$^3$LO) in a chiral extrapolation of the charmed baryon masses. At N$^2$LO we find 16 low-energy parameters. There are 3 mass parameters for the anti-triplet and the two sextet baryons, 6 parameters describing the meson-baryon vertices and 7 symmetry breaking parameters. The heavy-quark spin symmetry...
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1402.6427
5
5.0
Jun 30, 2018
06/18
by
A. V. Borisov; P. E. Sizin
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We calculate the neutrino luminosity of a degenerate electron gas in a strong magnetic field via plasmon decay to a neutrino pair due to neutrino electromagnetic moments and obtain the relative upper bounds on the effective neutrino magnetic moment.
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1406.3301
5
5.0
Jun 30, 2018
06/18
by
Stefan Dittmaier; Petra Häfliger; Michael Krämer; Michael Spira; Manuel Walser
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Within the minimal supersymmetric extension of the Standard Model (MSSM) the associated production of neutral Higgs bosons with top and bottom quarks belongs to the most important Higgs-boson production processes at the LHC. At large values of tan(beta), in particular, bottom--Higgs associated production constitutes the dominant production channel within the MSSM. We have calculated the next-to-leading-order supersymmetric QCD corrections to neutral Higgs production through the parton processes...
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1406.5307
4
4.0
Jun 30, 2018
06/18
by
W. H. Liang; E. Oset
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We describe the $B^0$ and $B^0_s$ decays into $J/\psi$ $f_0(500)$ and $J/\psi$ $f_0(980)$ by taking into account the dominant process for the weak decay of $B^0$ and $B^0_s$ into $J/\psi$ and a $q \bar q$ component. After hadronization of this $q \bar q$ component into pairs of pseudoscalar mesons we obtain certain weights for the meson-meson components and allow them to interact among themselves. The final state interaction of the meson-meson components, described in terms of chiral unitary...
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1406.7228
3
3.0
Jun 30, 2018
06/18
by
Bhaskar Dutta; Ilia Gogoladze; Rizwan Khalid; Qaisar Shafi
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We present some R-parity conserving supersymmetric models which can accommodate the 3.5 keV X-ray line reported in recent spectral studies of the Perseus galaxy cluster and the Andromeda galaxy. Within the Minimal Supersymmetric Standard Model (MSSM) framework, the dark matter (DM) gravitino (or the axino) with mass of around 7 keV decays into a massless neutralino (bino) and a photon with lifetime ~10^{28} sec. The massless bino contributes to the effective number of neutrino species N_eff and...
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1407.0863
3
3.0
Jun 30, 2018
06/18
by
Shao-Zhou Jiang; Feng-Jun Ge; Qing Wang
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We construct the full p6 order chiral Lagrangians for the unitary group and special unitary groups, including nf-, three- and two-flavor cases, all bilinear currents (scalar, pseudoscalar, vector, axial-vector and tensor currents) and theta parameter. The number of independent operators are 1391, 1326 and 969 for each of the flavor unitary groups. From these results, we find one extra linear relation among the traditional p4 order low-energy constants under the U(3) group, and some more linear...
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1401.0317
4
4.0
Jun 30, 2018
06/18
by
Shinya Kanemura; Mariko Kikuchi; Kei Yagyu
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We calculate one-loop corrected Yukawa coupling constants $hf\bar{f}$ for the standard model like Higgs boson $h$ in two Higgs doublet models. We focus on the models with the softly-broken $Z_2$ symmetry, which is imposed to avoid the flavor changing neutral current. Under the $Z_2$ symmetry, there are four types of Yukawa interactions. We find that one-loop contributions from extra Higgs bosons modify the $hf\bar{f}$ couplings to be maximally about $5\%$ under the constraint from perturbative...
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1401.0515
3
3.0
Jun 30, 2018
06/18
by
Chul Kim; Ahmad Idilbi; Thomas Mehen; Yeo Woong Yoon
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Although the Large Hadron Collider (LHC) has not observed supersymmetric (SUSY) partners of the Standard Model particles, their existence is not ruled out yet. One recently explored scenario in which there are light SUSY partners that have evaded current bounds from the LHC is that of a light long-lived stop quark. In this paper we consider light stop pair production at the LHC when the stop mass is between 200 and 400 GeV. If the stops are long-lived they can form a bound state, stoponium,...
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1401.1284
4
4.0
Jun 30, 2018
06/18
by
G. R. Boroun
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We computed the longitudinal proton structure function $F_{L}$, using the nonlinear Dokshitzer-Gribov-Lipatov-Altarelli-parisi (NLDGLAP) evolution equation approach at small $x$. For the gluon distribution, the nonlinear effects are related to the longitudinal structure function. As, the very small $x$ behavior of the gluon distribution is obtained by solving the Gribov, Levin, Ryskin, Mueller and Qiu (GLR-MQ) evolution equation with the nonlinear shadowing term incorporated. We show, the...
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1402.1186
3
3.0
Jun 30, 2018
06/18
by
Charalampos Anastasiou; Claude Duhr; Falko Dulat; Elisabetta Furlan; Thomas Gehrmann; Franz Herzog; Bernhard Mistlberger
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We present the cross-section for the threshold production of the Higgs boson at hadron-colliders at next-to-next-to-next-to-leading order (N3LO) in perturbative QCD. We present an analytic expression for the partonic cross-section at threshold and the impact of these corrections on the numerical estimates for the hadronic cross-section at the LHC. With this result we achieve a major milestone towards a complete evaluation of the cross-section at N3LO which will reduce the theoretical...
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1403.4616
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4.0
Jun 30, 2018
06/18
by
J. Racker; N. Rius
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We propose a mechanism for baryogenesis from particle decays or annihilations that can work at the TeV scale. Some heavy particles annihilate or decay into a heavy sterile neutrino N (with M > 0.5 TeV) and a "light" one \nu (with m < < 100 GeV), generating an asymmetry among the two helicity degrees of freedom of \nu. This asymmetry is partially transferred to Standard Model leptons via fast Yukawa interactions and reprocessed into a baryon asymmetry by the electroweak...
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1406.6105
3
3.0
Jun 30, 2018
06/18
by
R. Martinez; J. Nisperuza; F. Ochoa; J. P. Rubio
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In the framework of an nonuniversal $U(1)'$ extension of the standard model, we propose an scalar candidate for cold dark matter which exhibits interactions with ordinary matter through Higgs and gauge bosons. Using limits from low energy observables, we find constraints on the new physics parameters of the model associated to the extra abelian symmetry, in particular, the mass of the additional neutral gauge boson $Z'$ and the new gauge coupling constant. We found that for the lower...
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1408.5153
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5.0
Jun 30, 2018
06/18
by
Baishali Saikia; D. K. Choudhury
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In this paper we make re-analysis of a self-similarity based model of the proton structure function at small \textit{x} pursued in recent years. The additional assumption is that it should be singularity free in the entire kinematic range $0
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1409.0397
3
3.0
Jun 29, 2018
06/18
by
Junfeng Sun; Yueling Yang; Qingxia Li; Gongru Lu; Jinshu Huang; Qin Chang
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With the potential prospects of the ${\Upsilon}(1S)$ data samples at the running LHC and upcoming SuperKEKB, the ${\Upsilon}(1S)$ ${\to}$ $B_{c}{\rho}$ weak decays are studied with the pQCD approach. It is found that (1) the lion's share of branching ratio comes from the longitudinal polarization helicity amplitudes; (2) branching ratio for the ${\Upsilon}(1S)$ ${\to}$ $B_{c}{\rho}$ decay can reach up to ${\cal O}(10^{-9})$, which might be hopefully measurable.
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1601.00259
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3.0
Jun 29, 2018
06/18
by
Ilja Dorsner; Svjetlana Fajfer; Nejc Kosnik
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We advocate the possibility that the observed diphoton excess at 750 GeV at the LHC can be addressed by the scalar field that is a part of the SU(5) symmetry breaking sector. The field in question is the Standard Model singlet that resides in the adjoint representation that breaks SU(5) down to SU(3) x SU(2) x U(1). We also show that the required production and subsequent decay to two photons of this singlet can be induced by individual or combined contribution of two scalar multiplets $S_3$...
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1601.03267
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3.0
Jun 29, 2018
06/18
by
Massimiliano Grazzini; Stefan Kallweit; Dirk Rathlev
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We present results from the first fully differential next-to-next-to leading order NNLO QCD computation of ZZ production, including off-shell effects, the leptonic decay and non-resonant contributions. We compare theoretical predictions to fiducial cross sections and distributions measured by ATLAS and CMS at 8 TeV and also perform a first comparison with early ATLAS measurements at 13 TeV.
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1601.06036
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3.0
Jun 29, 2018
06/18
by
Johannes Heinonen; Thomas Mannel
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Motivated by the recent experimental data of the values of the Heavy Quark Expansion parameters, in particular the spin-orbit and Darwin terms, we argue that nature actually may be close to a limit of QCD which has been suggested by Uraltsev more than ten years ago. Assuming that this limit is not accidental, we derive the relations among the Heavy Quark Expansion parameters that occur up to the order 1/mb^5.
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1609.01334
2
2.0
Jun 30, 2018
06/18
by
Bo Hu
texts
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In this paper, we study residual symmetries in the lepton sector. Our first concern is the symmetry of the charged lepton mass matrix in the basis where the Majorana neutrino mass matrix is diagonal, which is strongly constrained by the requirement that the symmetry group generated by residual symmetries is finite. In a recent work R. M. Fonseca and W. Grimus found that there exists a set of constraint equations that can be completely solved, which is essential in their approach to the...
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1407.4722
2
2.0
Jun 30, 2018
06/18
by
Tianbo Liu; Bo-Qiang Ma
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We investigate the generalized form factors of the nucleon in a light-cone spectator-diquark model. Compared to the form factors, the generalized form factors contain some more information of the structure of the nucleon. In our calculation, both the scalar and the axial-vector spectator-diquark are taken into account. As a relation between the spin in the instant form and that in the light-cone form, the Melosh-Wigner rotation effect is included for both the quark and the axial-vector diquark....
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1408.4873
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2.0
Jun 30, 2018
06/18
by
M. Gluck
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It is shown that the recent determination of the various proton charge extensions is compatible with Standard Model expectations.
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1412.3423
3
3.0
Jun 28, 2018
06/18
by
Dario Buttazzo
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A scalar singlet, coupled to the other particles only through its mixing with the Higgs boson, appears in several motivated extensions of the Standard Model. The prospects for the discovery of a generic singlet at the various stages of the LHC, as well as at future high-energy colliders, are studied, and the reach of direct searches is compared with the precision attainable with Higgs couplings measurements. The results are then applied to the NMSSM and Twin Higgs.
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1512.07576
3
3.0
Jun 29, 2018
06/18
by
Qi Wu; Gang Li; Fenglan Shao; Qianwen Wang; Ruiqin Wang; Yawei Zhang; Ying Zheng
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In this work, we investigate the production of $X_b$ in the process $\Upsilon(5S,6S)\to \gamma X_b$, where $X_b$ is assumed to be the counterpart of $X(3872)$ in the bottomonium sector as a $B {\bar B}^*$ molecular state. We use the effective Lagrangian based on the heavy quark symmetry to explore the rescattering mechanism and calculate their production ratios. Our results have shown that the production ratios for the $\Upsilon(5S,6S) \to \gamma X_b$ are orders of $10^{-5}$ with reasonable...
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1606.05118
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3.0
Jun 29, 2018
06/18
by
Francesco Giovanni Celiberto; Dmitry Yu. Ivanov; Beatrice Murdaca; Alessandro Papa
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A study of the production of Mueller-Navelet jets at 13 TeV LHC is presented, including BFKL resummation effects and investigating three different variants of the BLM scale optimization method. It is shown how the cross section and the azimuthal observables are affected by the exclusion of the events where, for a given rapidity interval between the two jets, one of these is produced in the central region.
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1606.08892
2
2.0
Jun 30, 2018
06/18
by
A. Hartin; S. Porto; G. Moortgat-Pick
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The future linear collider will collide dense $e^+e^-$ bunches at high energies up to 1 TeV, generating very intense electromagnetic fields at the interaction point (IP). These fields are strong enough to lead to nonlinear effects which affect all IP processes and which are described by strong field physics theory. In order to test this theory, we propose an experiment that will focus an intense laser on the LC electron beam post-IP. Similar experiments at SLAC E144 have investigated nonlinear...
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1404.0810
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7.0
Jun 30, 2018
06/18
by
Samandeep Sharma; Priyanka Fakay; Gulsheen Ahuja; Manmohan Gupta
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In the light of the recent measurement of the leptonic mixing angle $\theta_{13}$, implications of the latest mixing data have been investigated for non-minimal textures of lepton mass matrices assuming the neutrinos to be Majorana like. Large number of possible texture specific lepton mass matrices have been examined for their compatibility with the lepton mixing data in the case of normal hierarchy, inverted hierarchy and degenerate scenario of neutrino masses. Specifically, apart from other...
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1402.1598
