Thu·Sep 15, 2016Thursday·September 15, 2016

1. 01*

   Mixed QCD-EW corrections for Higgs boson production at $e^{+}{e}^{-}$ colliders

   Yinqiang Gong🇨🇳 · Zhao Li🇨🇳 · Xiaofeng Xu🇨🇳 · Li Lin Yang🇨🇳 · Xiaoran Zhao🇧🇪

   Since the discovery of the Higgs boson at the Large Hadron Collider, a future electron-position collider has been proposed for precisely studying its properties. We investigate the production of the Higgs boson at such an $e^{+}{e}^{-}$ collider associated with a $Z$ boson, and calculate for the first time the mixed QCD-electroweak corrections to the total cross sections. We provide an approximate analytic formula for the cross section and show that it reproduces the exact numeric results rather well for collider energies up to 350 GeV. We also provide numeric results for $\sqrt{s}=500$ GeV, where the approximate formula is no longer valid. We find that the $\mathcal{O}(\alpha {\alpha }_s)$ corrections amount to a 1.3% increase of the cross section for a center-of-mass energy around 240 GeV. This is significantly larger than the expected experimental accuracy and has to be included for extracting the properties of the Higgs boson from the measurements of the cross sections in the future.

   hep-phPRD(2017)·51 citations
2. 02*

   Dipole spin polarizabilities and gyrations of spin-1 particles in the Duffin-Kemmer-Petiau formalism

   N.V. Maksimenko🇧🇾 · E.V. Vakulina🇷🇺 · S.M. Kuchin🇷🇺

   In this paper relativistic-invariant phenomenological Lagrangians of interaction between spin-1 particles and electromagnetic field were obtained in the Duffin-Kemmer-Petiau formalism on the basis of the covariant model that takes into account both spin polarizabilities and gyrations of the above-mentioned particles. It was shown that in the suggested covariant model with regard to the crossing symmetry, spatial parity and gauge invariance conservation laws, definite spin polarizabilities and gyrations of spin-1 particles contribute to the expansion of Compton scattering amplitude, starting from the corresponding orders on energy of pfotons that is in the agreement with low-energy theorems for that process.

   hep-phRuss.Phys.J.(2016)·0 citations
3. 03*

   van der Waals Interactions in Hadron Resonance Gas: From Nuclear Matter to Lattice QCD

   Volodymyr Vovchenko🇩🇪 · Mark I. Gorenstein🇺🇦 · Horst Stoecker🇩🇪

   An extension of the ideal hadron resonance gas (HRG) model is constructed which includes the attractive and repulsive van der Waals (VDW) interactions between baryons. This VDW-HRG model yields the nuclear liquid-gas transition at low temperatures and high baryon densities. The VDW parameters $a$ and $b$ are fixed by the ground state properties of nuclear matter, and the temperature dependence of various thermodynamic observables at zero chemical potential are calculated within VDW-HRG model. Compared to the ideal HRG model, the inclusion of VDW interactions between baryons leads to a qualitatively different behavior of second and higher moments of fluctuations of conserved charges, in particular in the so-called crossover region $T\sim 140-190$ MeV. For many observables this behavior resembles closely the results obtained from lattice QCD simulations. This hadronic model also predicts nontrivial behavior of net-baryon fluctuations in the region of phase diagram probed by heavy-ion collision experiments. These results imply that VDW interactions play a crucial role in thermodynamics of hadron gas. Thus, the commonly performed comparisons of the ideal HRG model with the lattice and heavy-ion data may lead to misconceptions and misleading conclusions.

   hep-phhep-latnucl-thPRL(2017)·220 citations
4. 04*

   Mixed electroweak-QCD corrections to $e^{+}{e}^{-}\to HZ$ at Higgs factory

   Qing-Feng Sun🇨🇳 · Feng Feng🇨🇳 · Yu Jia🇨🇳 · Wen-Long Sang🇨🇳

   The prospective Higgs factories, exemplified by ILC, FCC-ee and CEPC, plan to conduct the precision Higgs measurements at the $e^{+}{e}^{-}$ center-of-mass energy around 250 GeV. The cross sections for the dominant Higgs production channel, the Higgsstrahlung process, can be measured to a (sub-) percent accuracy. Merely incorporating the well-known next-to-leading order (NLO) electroweak corrections appears far from sufficient to match the unprecedented experimental precision. In this work, we make an important advancement toward this direction by investigating the mixed electroweak-QCD corrections to $e^{+}{e}^{-}\to HZ$ at next-to-next-to-leading order (NNLO) for both unpolarized and polarized $Z$ boson. The corrections turn out to reach one percent level of the Born-order results, thereby must be incorporated in the future confrontation with the data.

   hep-phhep-exPRD(2017)·57 citations
5. 05*

   The Analytic Structure of Non-Global Logarithms: Convergence of the Dressed Gluon Expansion

   Andrew J. Larkoski🇺🇸 · Ian Moult🇺🇸 · Duff Neill🇺🇸

   Non-global logarithms (NGLs) are the leading manifestation of correlations between distinct phase space regions in QCD and gauge theories and have proven a challenge to understand using traditional resummation techniques. Recently, the dressed gluon expansion was introduced that enables an expansion of the NGL series in terms of a "dressed gluon" building block, defined by an all-orders factorization theorem. Here, we clarify the nature of the dressed gluon expansion, and prove that it has an infinite radius of convergence as a solution to the leading logarithmic and large-$N_c$ master equation for NGLs, the Banfi-Marchesini-Smye (BMS) equation. The dressed gluon expansion therefore provides an expansion of the NGL series that can be truncated at any order, with reliable uncertainty estimates. In contrast, manifest in the results of the fixed-order expansion of the BMS equation up to 12-loops is a breakdown of convergence at a finite value of ${\alpha }_s$log. We explain this finite radius of convergence using the dressed gluon expansion, showing how the dynamics of the buffer region, a region of phase space near the boundary of the jet that was identified in early studies of NGLs, leads to large contributions to the fixed order expansion. We also use the dressed gluon expansion to discuss the convergence of the next-to-leading NGL series, and the role of collinear logarithms that appear at this order. Finally, we show how an understanding of the analytic behavior obtained from the dressed gluon expansion allows us to improve the fixed order NGL series using conformal transformations to extend the domain of analyticity. This allows us to calculate the NGL distribution for all values of ${\alpha }_s$log from the coefficients of the fixed order expansion.

   hep-phhep-thnucl-thJHEP(2016)·50 citations
6. 06*

   Explaining Dark Matter and $B$ Decay Anomalies with an $L_{\mu }-L_{\tau }$ Model

   Wolfgang Altmannshofer🇺🇸 · Stefania Gori🇺🇸 · Stefano Profumo🇺🇸 · Farinaldo S. Queiroz🇩🇪

   We present a dark sector model based on gauging the $L_{\mu }-L_{\tau }$ symmetry that addresses anomalies in $b\to s{\mu }^{+}{\mu }^{-}$ decays and that features a particle dark matter candidate. The dark matter particle candidate is a vector-like Dirac fermion coupled to the $Z^{\prime }$ gauge boson of the $L_{\mu }-L_{\tau }$ symmetry. We compute the dark matter thermal relic density, its pair-annihilation cross section, and the loop-suppressed dark matter-nucleon scattering cross section, and compare our predictions with current and future experimental results. We demonstrate that after taking into account bounds from $B_s$ meson oscillations, dark matter direct detection, and the CMB, the model is highly predictive: $B$ physics anomalies and a viable particle dark matter candidate, with a mass of $\sim (5-23)$~GeV, can be accommodated only in a tightly-constrained region of parameter space, with sharp predictions for future experimental tests. The viable region of parameter space expands if the dark matter is allowed to have $L_{\mu }-L_{\tau }$ charges that are smaller than those of the SM leptons.

   hep-phhep-exJHEP(2016)·249 citations
7. 07*

   A Discussion on Triangle Singularities in the ${\Lambda }_b\to J/\psi K^{-}p$ Reaction

   Melahat Bayar🇹🇷 · Francesca Aceti🇪🇸 · Feng-Kun Guo🇨🇳 · Eulogio Oset🇪🇸

   We have analyzed the singularities of a triangle loop integral in detail and derived a formula for an easy evaluation of the triangle singularity on the physical boundary. It is applied to the ${\Lambda }_b\to J/\psi K^{-}p$ process via ${\Lambda }^{\ast }$-charmonium-proton intermediate states. Although the evaluation of absolute rates is not possible, we identify the ${\chi }_{c1}$ and the $\psi (2S)$ as the relatively most relevant states among all possible charmonia up to the $\psi (2S)$. The $\Lambda (1890){\chi }_{c1}p$ loop is very special as its normal threshold and triangle singularities merge at about 4.45 GeV, generating a narrow and prominent peak in the amplitude in the case that the ${\chi }_{c1}p$ is in an $S$-wave. We also see that loops with the same charmonium and other ${\Lambda }^{\ast }$ hyperons produce less dramatic peaks from the threshold singularity alone. For the case of ${\chi }_{c1}p\to J/\psi p$ and quantum numbers $3/2^{-}$ or $5/2^{+}$ one needs $P$- and $D$-waves, respectively, in the ${\chi }_{c1}p$, which drastically reduce the strength of the contribution and smooth the threshold peak. In this case we conclude that the singularities cannot account for the observed narrow peak. In the case of $1/2^{+}$, $3/2^{+}$ quantum numbers, where ${\chi }_{c1}p\to J/\psi p$ can proceed in an $S$-wave, the $\Lambda (1890){\chi }_{c1}p$ triangle diagram could play an important role, though can neither assert their strength without further input from experiments and lattice QCD calculations.

   hep-phPRD(2016)·193 citations
8. 08*

   2HDM Higgs-to-Higgs Decays at Next-to-Leading Order

   Marcel Krause🇩🇪 · Margarete Muhlleitner🇩🇪 · Rui Santos🇵🇹 · Hanna Ziesche🇩🇪

   The detailed investigation of the Higgs sector at present and future colliders necessitates from the theory side as precise predictions as possible, including higher order corrections. An important ingredient for the computation of higher order corrections is the renormalization of the model parameters and fields. In this paper we complete the renormalization of the 2-Higgs-Doublet Model (2HDM) Higgs sector launched in a previous contribution with the investigation of the renormalization of the mixing angles $\alpha$ and $\beta$. Here, we treat the renormalization of the mass parameter $m_{12}^2$ that softly breaks the ${\mathbb{Z}}_2$ symmetry of the 2HDM Higgs sector. We investigate the impact of two different renormalization schemes on the sample Higgs-to-Higgs decay $H\to hh$. This decay also allows us to analyze the renormalization of the mixing angles and to confirm the properties extracted before in other Higgs decays. In conclusion we find that a gauge-independent, process-independent and numerically stable renormalization of the 2HDM Higgs sector is given by the application of the tadpole-pinched scheme for the mixing angles $\alpha$ and $\beta$ and by the use of the $\overline{MS}$ scheme for $m_{12}^2$.

   hep-phPRD(2017)·68 citations
9. 09*

   Is nonstandard interaction a solution to the three neutrino tensions?

   Shinya Fukasawa🇯🇵 · Monojit Ghosh🇯🇵 · Osamu Yasuda🇯🇵

   In this work we present a scenario in which a nonstandard interaction in neutrino propagation can explain the three major tensions in the neutrino oscillation data at present. These tensions are: (i) a non-zero best-fit value of the non-standard oscillation parameters in the the global analysis of the solar and KamLAND data which rules out the standard oscillation scenario at $90\%$ C.L, (ii) the measurement of the non-maximal value of ${\theta }_{23}$ by NO$\nu$A which excludes the maximal mixing at $2.5\sigma$ C.L. and (iii) a discrepancy in the ${\theta }_{13}$ measurement by T2K which has a tension with the reactor best-fit value of ${\sin }^2{\theta }_{13}=0.021$ at $90\%$ C.L. Our results show that all these three above mentioned anomalies can be explained if one assumes the existence of the non-standard interactions in neutrino propagation with ${\theta }_{23}=45^{\circ }$ and ${\sin }^2{\theta }_{13}=0.021$ in the case of normal hierarchy. In our scenario the phase of ${ϵ}_{e\tau }$ is zero and the most favorable value of the Dirac CP phase is approximately $255^{\circ }$.

   hep-ph12 citations
10. 10*

    Observable Lepton Number Violation with Predominantly Dirac Nature of Active Neutrinos

    Debasish Borah🇮🇳 · Arnab Dasgupta🇮🇳

    We study a specific version of $SU(2{)}_R\times SU(2{)}_L\times U(1{)}_{B-L}$ models extended by discrete symmetries where the new physics sector responsible for tiny neutrino masses at leading order remains decoupled from the new physics sector that can give rise to observable signatures of lepton number violation such as neutrinoless double beta decay. More specifically, the dominant contribution to light neutrino masses comes from a one-loop Dirac mass. At higher loop level, a tiny Majorana mass also appears which remains suppressed by many order of magnitudes in comparison to the Dirac mass. Such a model where the active neutrinos are predominantly of Dirac type, also predicts observable charged lepton flavour violation like $\mu \to 3e,\mu \to e\gamma$ and multi-component dark matter.

    hep-phJHEP(2017)·37 citations
11. 11*

    Inclusive Single-Spin Asymmetries, Quark-Photon, and Quark-Quark Correlations

    Matthias Burkardt🇺🇸

    We consider quark-photon correlations that have been proposed as a source for single-spin asymmetries in inclusive deep-inelastic scattering. A new sum rule for these correlators is derived and its phenomenological consequences are discussed. The results are interpreted within the context of an intuitive 'electrodynamic lensing' picture.

    hep-phPRD(2016)·0 citations
12. 12*

    Lam-Tung relation breaking in $Z^0$ hadroproduction as a probe of parton transverse momentum

    Leszek Motyka🇵🇱 · Mariusz Sadzikowski🇵🇱 · Tomasz Stebel🇵🇱

    The Lam-Tung relation breaking coefficient $A_{\mathrm{LT}}=A_0-A_2$ in the Drell-Yan dilepton angular distributions in the $Z^0$ boson mass region at the LHC is analyzed in the $k_T$-factorization approach. This observable was recently measured with high precision by ATLAS collaboration. Within the $k_T$-factorization approach we perform an approximate $\mathcal{O}({\alpha }_{\mathrm{em}}{\alpha }_s^2)$ calculation of the off-shell parton hard matrix elements in which we include the leading tree level contributions of valence quarks and off-shell gluons: the $q_{\mathrm{val}}{g}^{\ast }\to q{Z}^0$ channel and the $g^{\ast }{g}^{\ast }\to q\bar{q}{Z}^0$ channel. The resulting $A_{\mathrm{LT}}$ exhibits high sensitivity to the gluon transverse momentum distribution (TMD). Several gluon TMDs are probed derived from the CCFM and BFKL evolution equations, and given by QCD-inspired phenomenological parameterizations. The ATLAS data favor a simple "Weizsäcker-Williams" (WW) hard gluon TMD with the asymptotic behavior of one-gluon exchange at large gluon transverse momenta and moderate $x$. It is verified that the proposed approach with the WW gluon TMD describes well also the $A_0$ and $A_2$ angular coefficients at the $Z^0$ peak, as well as the Drell-Yan dilepton mass distribution at lower masses. We conclude that inclusion of gluon transverse momentum effects improves description of the angular distributions of Drell-Yan dileptons and that the Drell-Yan scattering provides an excellent probe of the parton TMDs.

    hep-phPRD(2017)·60 citations
13. 13*

    DbarD and DD pair production at the LHCb in the parton Reggeization approach

    A.V. Karpishkov🇷🇺 · M.A. Nefedov🇷🇺 · V.A. Saleev🇷🇺 · A.V. Shipilova🇷🇺

    We study the inclusive DbarD and DD pair production in proton-proton collisions at the LHC at lead- ing order of the parton Reggeization approach endowed with universal scale-depended fragmen- tation functions for c-quark to D-meson and for gluon to D-meson transitions. We have described DbarD and DD distributions in azimuthal angle, as well as transverse momentum, rapidity distance, and invariant mass measured in the region of large rapidity 2 < y < 4 by the LHCb Collabora- tion at the LHC without free parameters. We have used Reggeized amplitudes for the processes RR - gg and RR - c barc which are obtained accordingly to Feynman rules of the L.N. Lipatov effective theory of Reggeized partons, and Kimber-Martin-Ryskin model for unintegrated gluon distribution function in a proton with Martin-Stirling-Thorne-Watt collinear parton distributions as inputs.

    hep-phPoS(2016)·0 citations
14. 14*

    On high-order perturbative calculations at finite density

    Ioan Ghisoiu🇫🇮 · Tyler Gorda🇫🇮 · Aleksi Kurkela🇨🇭 · Paul Romatschke🇺🇸 · Matias Säppi🇫🇮 · Aleksi Vuorinen🇫🇮

    We discuss the prospects of performing high-order perturbative calculations in systems characterized by a vanishing temperature but finite density. In particular, we show that the determination of generic Feynman integrals containing fermionic chemical potentials can be reduced to the evaluation of three-dimensional phase space integrals over vacuum on-shell amplitudes - a result reminiscent of a previously proposed "naive real-time formalism" for vacuum diagrams. Applications of these rules are discussed in the context of the thermodynamics of cold and dense QCD, where it is argued that they facilitate an extension of the Equation of State of cold quark matter to higher perturbative orders.

    hep-phnucl-thNPB(2017)·35 citations
15. 15*

    Hadronic structure of the photon at small x in holographic QCD

    Akira Watanabe🇹🇼 · Hsiang-nan Li🇹🇼

    We present our analysis on the photon structure functions at small Bjorken variable x in the framework of the holographic QCD. In the kinematic region, a photon can fluctuate into vector mesons and behaves like a hadron rather than a pointlike particle. Assuming the Pomeron exchange dominance, the dominant hadronic contribution to the structure functions is computed by convoluting the probe and target photon density distributions obtained from the wave functions of the U(1) vector field in the five-dimensional AdS space and the Brower-Polchinski-Strassler-Tan Pomeron exchange kernel. Our calculations are in agreement with both the experimental data from OPAL collaboration at LEP and those calculated from the parton distribution functions of the photon proposed by Glück, Reya, and Schienbein. The predictions presented here will be tested at future linear colliders, such as the planned International Linear Collider.

    hep-phnucl-thEPJ Web Conf.(2016)·0 citations
16. 16*

    Photoproduction of vector mesons: from ultraperipheral to semi-central heavy ion collisions

    M. Klusek-Gawenda🇵🇱 · A. Szczurek🇵🇱

    We discuss nuclear cross sections for $AA\to AAV$ and $AA\to AAVV$ reactions with one or two vector mesons in the final state. Our analysis is done in the impact parameter space equivalent photon approximation. This approach allows to consider the above processes taking into account distance between colliding nuclei. We consider both ultraperipheral and semi-central collisions. We are a first group which undertook a study of single $J/\psi$ photoproduction for different centrality bins. We show that one can describe new ALICE experimental data by including geometrical effects of collisions in the flux factor. Next, total and differential cross section for double-scattering mechanism in the exclusive $AA\to AAVV$ reaction in ultrarelativistic ultraperipheral heavy ion collisions is presented. In this context we consider double photoproduction and photon-photon processes. Simultaneously, we get very good agreement of our results with STAR (RHIC), CMS and ALICE (LHC) experimental data for single ${\rho }^0$ and $J/\psi$ vector meson production. A comparison of our predictions for exclusive four charged pions production is also presented.

    hep-phnucl-exnucl-thEPJ Web Conf.(2016)·4 citations
17. 17*

    Explaining the $R_K$ and $R_{D^{(\ast )}}$ anomalies with vector leptoquarks

    Suchismita Sahoo🇮🇳 · Rukmani Mohanta🇮🇳 · Anjan K. Giri🇮🇳

    Recently the $B$ factories BaBar and Belle as well as the LHCb experiment have reported several anomalies in the semileptonic $B$ meson decays such as $R_K$ and $R_{D^{(\ast )}}$ etc. We investigate these deviations by considering the vector leptoquarks relevant for both $b\to s{l}^{+}{l}^{-}$ and $b\to cl{\bar{\nu }}_l$ transitions. The leptoquark parameter space is constrained by using the experimentally measured branching ratios of $B_s\to l^{+}{l}^{-}$, $\bar{B}\to X_s{l}^{+}{l}^{-}(\nu \bar{\nu })$ and $B_u^{+}\to l^{+}{\nu }_l$ processes. Using the constrained leptoquark couplings, we compute the branching ratios, forward-backward asymmetries, $\tau$ and $D^{\ast }$ polarization parameters in the $\bar{B}\to D^{(\ast )}l{\bar{\nu }}_l$ processes. We find that the vector leptoquarks can explain both $R_{D^{(\ast )}}$ and $R_K$ anomalies simultaneously. Furthermore, we study the rare leptonic $B_{u,c}^{\ast }\to l\bar{\nu }$ decay processes in this model.

    hep-phPRD(2017)·137 citations
18. 18*

    Octet Baryon Magnetic Moments from Lattice QCD: Approaching Experiment from a Three-Flavor Symmetric Point

    Assumpta Parreno🇪🇸 · Martin J. Savage🇺🇸 · Brian C. Tiburzi🇺🇸 · Jonas Wilhelm🇩🇪 · Emmanuel Chang🇺🇸 · William Detmold🇺🇸 · Kostas Orginos🇺🇸

    Lattice QCD calculations with background magnetic fields are used to determine the magnetic moments of the octet baryons. Computations are performed at the physical value of the strange quark mass, and two values of the light quark mass, one corresponding to the three-flavor symmetric point, where the pion mass is 800 MeV, and the other corresponding to a pion mass of 450 MeV. The moments are found to exhibit only mild pion-mass dependence when expressed in terms of appropriately chosen magneton units- the natural baryon magneton. A curious pattern is revealed among the anomalous baryon magnetic moments which is linked to the constituent quark model, however, careful scrutiny exposes additional features. Relations expected to hold in the large-Nc limit of QCD are studied; and, in one case, a clear preference for the quark model over the large-Nc prediction is found. The magnetically coupled Lambda-Sigma system is treated in detail at the three-flavor symmetric point, with the lattice QCD results comparing favorably with predictions based on SU(3)F symmetry. This analysis enables the first extraction of the isovector transition magnetic polarizability. The possibility that large magnetic fields stabilize strange matter is explored, but such a scenario is found to be unlikely.

    ↳ hep-lathep-phnucl-thPRD(2017)·42 citations
19. 19*

    Decoherence as a way to measure extremely soft collisions with dark matter

    C. Jess Riedel🇨🇦 · Itay Yavin🇨🇦

    A new frontier in the search for dark matter (DM) is based on the idea of detecting the decoherence caused by DM scattering against a mesoscopic superposition of normal matter. Such superpositions are uniquely sensitive to very small momentum transfers from new particles and forces, especially DM with a mass below 100 MeV. Here we investigate what sorts of dark sectors are inaccessible with existing methods but would induce noticeable decoherence in the next generation of matter interferometers. We show that very soft, but medium range (0.1 nm - 1 $\mu$m) elastic interactions between nuclei and DM are particularly suitable. We construct toy models for such interactions, discuss existing constraints, and delineate the expected sensitivity of forthcoming experiments. The first hints of DM in these devices would appear as small variations in the anomalous decoherence rate with a period of one sidereal day. This is a generic signature of interstellar sources of decoherence, clearly distinguishing it from terrestrial backgrounds. The OTIMA experiment under development in Vienna will begin to probe Earth-thermalizing DM once sidereal variations in the background decoherence rate are pushed below one part in a hundred for superposed 5-nm gold nanoparticles. The proposals by Bateman et al. and Geraci et al. could be similarly sensitive, although they would require at least a month of data taking. DM that is absorbed or elastically reflected by the Earth, and so avoids a greenhouse density enhancement, would not be detectable by those three experiments. On the other hand, the aggressive proposals of the MAQRO collaboration and Pino et al. would immediately open up many orders of magnitude in DM mass, interaction range, and coupling strength, regardless of how DM behaves in bulk matter.

    ↳ quant-phastro-ph.COhep-phPRD(2017)·54 citations
20. 20*

    The theoretical physics ecosystem behind the discovery of the Higgs boson

    James D. Wells🇺🇸

    The discovery of the Higgs boson in 2012 was one of the most significant developments of science in the last half century. A simplified history has Peter Higgs positing it in the mid-1960s followed by a long wait while experimentalists progressively turned up collider energies until it appeared several decades later. However, in order for both the hypothesis and the experimental discovery to occur, a vast and complex theory ecosystem had to thrive in the years before Higgs's hypothesis and in the years that followed, building up to its discovery. It is further claimed that the Higgs boson hypothesis was an immoderate speculation, and therefore faith in theory argumentation and speculation was mandatory for the discovery program to proceed and reach its fulfillment. The Higgs boson could not have been discovered experimentally by accident.

    ↳ physics.hist-phhep-exhep-ph4 citations
21. 21*

    Effect of magnetic field on the photon radiation from quark-gluon plasma in heavy ion collisions

    B.G. Zakharov🇷🇺

    We develop a formalism for the photon emission from the quark-gluon plasma with an external electromagnetic field. We then use it to investigate the effect of magnetic field on the photon emission from the quark-gluon plasma created in $AA$ collisions. We find that even for very optimistic assumption on the magnitude of the magnetic field generated in $AA$ collisions its effect on the photon emission rate is practically negligible. For this reason the magnetic field cannot generate a significant azimuthal asymmetry in the photon spectrum.

    ↳ nucl-thhep-phEPJC(2016)·38 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.