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Of all publications in the section: 33
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Article
Akhmedov E., Burda P. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics. 2010. Vol. 687. P. 267-270.
Article
Frenkel E., Feigin B. L. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics. 1990. Vol. 246. No. 1-2. P. 71-74.
Article
Musaev E., Perry M. J., Berman D. S. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics. 2011. Vol. 706. P. 228-231.

We propose a boundary action to complement the recently developed duality manifest actions in string and M-theory using generalized geometry. This boundary action combines the Gibbons–Hawking term with boundary pieces that were previously neglected in the construction of these actions. The combination may be written in terms of the metric of generalized geometry. The result is to produce an action that is duality invariant including boundary terms.

Article
Akhmedova V., Pilling T., de Gill A. et al. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics. 2009. Vol. 673. P. 227-231.
Article
Akhmedov E., Садофьев А. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics. 2012. Vol. 712. P. 138-142.

The generic feature of non-conformal fields in Poincaré patch of de Sitter space is the presence of large IR loop corrections even for massive fields. Moreover, in global de Sitter there are loop IR divergences for the massive fields. Naive analytic continuation from de Sitter to Anti-de-Sitter might lead one to conclude that something similar should happen in the latter space as well. However, we show that there are no large IR effects in the one-loop two-point functions in the Poincaré patch of Anti-de-Sitter space even for the zero mass minimally coupled scalar fields. As well there are neither large IR effects nor IR divergences in global Anti-de-Sitter space even for the zero mass.

Article
Derkach D., Aaij R., Adeva B. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics. 2015. Vol. 741. P. 1.
Article
Kononov Y., Morozov A. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics. 2015. No. 47.

HOMFLY polynomials are the Wilson-loop averages in Chern-Simons theory and depend on four variables: the closed line (knot) in 3d space-time, representation R of the gauge group SU(N) and exponentiated coupling constant q. From analysis of a big variety of different knots we conclude that at q, which is a 2m-th root of unity, q2m=1, HOMFLY polynomials in symmetric representations [r] satisfy recursion identity: Hr+m=Hr{dot operator}Hm for any A=qN, which is a generalization of the property Hr=H1r for special polynomials at m=1. We conjecture a further generalization to arbitrary representation R, which, however, is checked only for torus knots. Next, Kashaev polynomial, which arises from HR at q2=e2πi/|R|, turns equal to the special polynomial with A substituted by A|R|, provided R is a single-hook representations (including arbitrary symmetric) - what provides a q-A dual to the similar property of Alexander polynomial. All this implies non-trivial relations for the coefficients of the differential expansions, which are believed to provide reasonable coordinates in the space of knots - existence of such universal relations means that these variables are still not unconstrained. © 2015 Published by Elsevier B.V.

Article
Derkach D., Borisyak M. A., Ustyuzhanin A. et al. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics. 2016. No. 762. P. 253-262.

A time-dependent angular analysis of Bs0→ψ(2S)ϕ decays is performed using data recorded by the LHCb experiment. The data set corresponds to an integrated luminosity of 3.0fb−1 collected during Run 1 of the LHC. The CP -violating phase and decay-width difference of the Bs0 system are measured to be ϕs=0.23−0.28+0.29±0.02rad and ΔΓs=0.066−0.044+0.041±0.007ps−1 , respectively, where the first uncertainty is statistical and the second systematic. This is the first time that ϕs and ΔΓs have been measured in a decay containing the ψ(2S) resonance.

Article
Frenkel E., Feigin B. L. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics. 1992. Vol. 276. No. 1-2. P. 79-86.
Article
Akhmedov E., Akhmedova V., Singleton D. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics. 2006. Vol. 642. P. 124-128.
Article
Ratnikov F., Ustyuzhanin A., Derkach D. et al. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics. 2017. Vol. 771. P. 21-30.

A search for CP violation in D± → η′ π± and Ds± → η′ π± decays is performed using proton-proton collision data, corresponding to an inte- grated luminosity of 3fb−1, recorded by the LHCb experiment at centre-of- mass energies of 7 and 8 TeV. The measured CP -violating charge asym- metries are ACP(D± → η′π±) = (−0.61 ± 0.72 ± 0.53 ± 0.12)% and ACP (Ds± → η′π±) = (−0.82 ± 0.36 ± 0.22 ± 0.27)%, where the first uncertain- ties are statistical, the second systematic, and the third are the uncertainties on the ACP (D± → KS0π±) and ACP (Ds± → φπ±) measurements used for calibration. The results represent the most precise measurements of these asymmetries to date.

Article
Hushchyn M., Ustyuzhanin A., Derkach D. et al. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics. 2017. Vol. 767. P. 177-187.

A measurement of the time-integrated CP asymmetry in the Cabibbo-suppressed decay D0→K−K+ is performed using pp collision data, corresponding to an integrated luminosity of 3fb−1, collected with the LHCb detector at centre-of-mass energies of 7 and 8 TeV. The flavour of the charm meson at production is determined from the charge of the pion in ⁎D⁎+→D0π+ and ⁎D⁎−→D‾0π− decays. The time-integrated CP asymmetry ACP(K−K+) is obtained assuming negligible CP violation in charm mixing and in Cabibbo-favoured D0→K−π+, D+→K−π+π+ and D+→K‾0π+ decays used as calibration channels. It is found to be

ACP(K−K+)=(0.14±0.15(stat)±0.10(syst))%.

A combination of this result with previous LHCb measurements yields

ACP(K−K+)=(0.04±0.12(stat)±0.10(syst))%,ACP(π−π+)=(0.07±0.14(stat)±0.11(syst))%.

These are the most precise measurements from a single experiment. The result for ACP(K−K+) is the most precise determination of a time-integrated CP asymmetry in the charm sector to date, and neither measurement shows evidence of CP asymmetry.

Article
Hushchyn M., Derkach D., Ustyuzhanin A. et al. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics. 2018. Vol. 777. P. 16-30.

Measurements of CP observables in B±→D(⁎)K± and B±→D(⁎)π± decays are presented, where D(⁎) indicates a neutral D or D⁎ meson that is an admixture of D(⁎)0 and D¯(⁎)0states. Decays of the D⁎ meson to the Dπ0 and  final states are partially reconstructed without inclusion of the neutral pion or photon, resulting in distinctive shapes in the Bcandidate invariant mass distribution. Decays of the D meson are fully reconstructed in the K±π∓, K+K− and π+π− final states. The analysis uses a sample of charged B mesons produced in pp collisions collected by the LHCb experiment, corresponding to an integrated luminosity of 2.0, 1.0 and 2.0 fb−1 taken at centre-of-mass energies of s=7, 8 and 13 TeV, respectively. The study of B±→D⁎K± and B±→D⁎π± decays using a partial reconstruction method is the first of its kind, while the measurement of B±→DK± and B±→Dπ± decays is an update of previous LHCb measurements. The B±→DK± results are the most precise to date.

Article
Derkach D., Aaij R. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics. 2014. Vol. 739. P. 218.
The B0bar-B0 and Bsbar-Bs production asymmetries, AP(B0) and AP(Bs), are measured by means of a time-dependent analysis of B0 -> J/\psi K*0, B0 -> D- pi+ and Bs -> Ds- pi+ decays, using a data sample corresponding to an integrated luminosity of 1.0 fb^{-1}, collected by LHCb in pp collisions at a centre-of-mass energy of 7 TeV. The measurements are performed as a function of transverse momentum and pseudorapidity of the B0 and Bs mesons within the LHCb acceptance. The production asymmetries, integrated over pT and eta in the range 4 < pT< 30 GeV/c and 2.5<eta<4.5, are determined to be AP(B0) = (-0.35 +/- 0.76 +/- 0.28)% and AP(Bs) = (1.09 +/- 2.61 +/- 0.66)%, where the first uncertainties are statistical and the second systematic.
Article
Derkach D., Aaij R. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics. 2013. Vol. 726. P. 151.

A combination of three LHCb measurements of the CKM angle $\gamma$ is presented. The decays $B^\pm\to DK^\pm$ and $B^\pm\to D\pi^\pm$ are used, where $D$ denotes an admixture of $D^0$ and $\overline{D^0}$ mesons, decaying into $K^+K^-$, $\pi^+\pi^-$, $K^\pm \pi^\mp$, $K^\pm \pi^\mp \pi^\pm \pi^\mp$, $K_S\pi^+\pi^-$, or $K_S K^+K^-$ final states. All measurements use a dataset corresponding to 1.0 fb$^{-1}$ of data. Combining results from $B^\pm\to DK^\pm$ decays alone a best-fit value of $\gamma = 72.0^\circ$ is found, and confidence intervals are set \begin{align*} \gamma \in [56.4,86.7]^\circ \quad &amp;{\rm at\ 68\%\,CL}\,,\\ \gamma \in [42.6,99.6]^\circ \quad &amp;{\rm at\ 95\%\,CL}\,. \end{align*} The best-fit value of $\gamma$ found from a combination of results from $B^\pm\to D\pi^\pm$ decays alone, is $\gamma = 18.9^\circ$, and the confidence intervals \begin{align*} \gamma \in [7.4,99.2]^\circ \quad \cup \quad [167.9,176.4]^\circ \quad &amp;{\rm at\ 68\%\,CL}\, \end{align*} are set, without constraint at $95\%$ CL. The combination of results from $B^\pm\to DK^\pm$ and $B^\pm\to D\pi^\pm$ decays gives a best-fit value of $\gamma = 72.6^\circ$ and the confidence intervals \begin{align*} \gamma \in [55.4,82.3]^\circ \quad &amp;{\rm at\ 68\%\,CL}\,,\\ \gamma \in [40.2,92.7]^\circ \quad &amp;{\rm at\ 95\%\,CL}\, \end{align*} are set. All values are expressed modulo $180^\circ$, and are obtained taking into account the effect of $D^0$--$\overline{D^0}$ mixing.

Article
Khachatryan V., Ratnikov F. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics. 2016. Vol. 760. P. 448-468.

An inclusive measurement of the  production cross section in pp collisions at  is presented, using data corresponding to an integrated luminosity of 19.6 fb−1collected with the CMS detector at the LHC. This measurement is based on the observation of events with large missing energy and with a single photon with transverse momentum above 145 and absolute pseudorapidity in the range |η|<1.44. The measured  production cross section, 52.7±2.1 (stat)±6.4 (syst)±1.4 (lumi) fb, agrees well with the standard model prediction of . A study of the photon transverse momentum spectrum yields the most stringent limits to date on the anomalous ZZγ and Zγγ trilinear gauge boson couplings.

Article
Сапронов А. А., Aad G., Glazov A. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics. 2016. Vol. 759. P. 601-621.

Measurements of the W±→ℓ±ν and Z→ℓ+ℓ− production cross sections (where ℓ±=e±,μ± ) in proton–proton collisions at s=13 TeV are presented using data recorded by the ATLAS experiment at the Large Hadron Collider, corresponding to a total integrated luminosity of 81 pb −1 . The total inclusive W± -boson production cross sections times the single-lepton-flavour branching ratios are σW+tot=11.83±0.02 (stat)±0.32 (sys)±0.25 (lumi) nb and σW−tot=8.79±0.02 (stat)±0.24 (sys)±0.18 (lumi) nb for W+ and W− , respectively. The total inclusive Z -boson production cross section times leptonic branching ratio, within the invariant mass window 66<mℓℓ<116 GeV , is σZtot=1.981±0.007 (stat)±0.038 (sys)±0.042 (lumi) nb . The W+ , W− , and Z -boson production cross sections and cross-section ratios within a fiducial region defined by the detector acceptance are also measured. The cross-section ratios benefit from significant cancellation of experimental uncertainties, resulting in σW+fid/σW−fid=1.295±0.003 (stat)±0.010 (sys) and σW±fid/σZfid=10.31±0.04 (stat)±0.20 (sys) . Theoretical predictions, based on calculations accurate to next-to-next-to-leading order for quantum chromodynamics and to next-to-leading order for electroweak processes and which employ different parton distribution function sets, are compared to these

Article
Khachatryan V., Ratnikov F. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics. 2016. No. 760. P. 365-386.

The charge asymmetry in  events is measured using dilepton final states produced inpp collisions at the LHC at . The data sample, collected with the CMS detector, corresponds to an integrated luminosity of . The measurements are performed using events with two oppositely charged leptons (electrons or muons) and two or more jets, where at least one of the jets is identified as originating from a bottom quark. The charge asymmetry is measured from differences in kinematic distributions, unfolded to the parton level, of positively and negatively charged top quarks and leptons. The  and leptonic inclusive charge asymmetries are found to be  and , respectively. These results, as well as charge asymmetry measurements made as a function of the invariant mass, rapidity, and transverse momentum of the  system, are in agreement with predictions of the standard model.

Article
A.S. Boldyrev, A.S. Maevskiy, ATLAS C. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics. 2018. Vol. 784. P. 173-191.

The observation of Higgs boson production in association with a top quark pair (tt¯H), based on the analysis of proton-proton collision data at a centre-of-mass energy of 13 TeV recorded with the ATLAS detector at the Large Hadron Collider, is presented. Using data corresponding to integrated luminosities of up to 79.8 fb−1, and considering Higgs boson decays into bb¯, WW∗, ττ, γγ, and ZZ∗, the observed significance is 5.8 standard deviations, compared to an expectation of 4.9 standard deviations. Combined with the tt¯H searches using a dataset corresponding to integrated luminosities of 4.5 fb−1 at 7 TeV and 20.3 fb−1 at 8 TeV, the observed (expected) significance is 6.3 (5.1) standard deviations. Assuming Standard Model branching fractions, the total tt¯H production cross section at 13 TeV is measured to be 670 ± 90 (stat.) +110−100 (syst.) fb, in agreement with the Standard Model prediction.