Pub Date : 2020-12-02DOI: 10.1103/PHYSREVD.103.L031501
Tian-Wei Wu, Ming-Zhu Liu, L. Geng
Motivated by the recent discovery of two new states in the $B^+rightarrow D^+D^-K^+$ decay by the LHCb Collaboration, we study the $Dbar{D}K$ three-body system by solving the Schr"odinger equation with the Gaussian Expansion Method. We show that the $Dbar{D}K$ system can bind with quantum numbers $I(J^P)=frac{1}{2}(0^-)$ and a binding energy of $B_3(Dbar{D}K)=48.9^{+1.4}_{-2.4}$ MeV. It can decay into $J/psi K$ and $D_sbar{D}^*$ via triangle diagrams, yielding a partial decay width of about 1 MeV. As a result, if discovered, it will serve as a highly nontrivial check on the nature of the many exotic hadrons discovered so far and on non-perturbative QCD as well. Assuming heavy quark spin symmetry, the same formalism is applied to study the $Dbar{D}^*K$ system, which is shown to also bind with quantum numbers $I(J^P)=frac{1}{2}(1^-)$ and a binding energy of $B_3(Dbar{D}^*K)simeq 77.3^{+3.1}_{-6.6}$ MeV, consistent with the results of previous works.
{"title":"Excited \u0000K\u0000 meson, \u0000Kc(4180)\u0000, with hidden charm as a \u0000DD¯K\u0000 bound state","authors":"Tian-Wei Wu, Ming-Zhu Liu, L. Geng","doi":"10.1103/PHYSREVD.103.L031501","DOIUrl":"https://doi.org/10.1103/PHYSREVD.103.L031501","url":null,"abstract":"Motivated by the recent discovery of two new states in the $B^+rightarrow D^+D^-K^+$ decay by the LHCb Collaboration, we study the $Dbar{D}K$ three-body system by solving the Schr\"odinger equation with the Gaussian Expansion Method. We show that the $Dbar{D}K$ system can bind with quantum numbers $I(J^P)=frac{1}{2}(0^-)$ and a binding energy of $B_3(Dbar{D}K)=48.9^{+1.4}_{-2.4}$ MeV. It can decay into $J/psi K$ and $D_sbar{D}^*$ via triangle diagrams, yielding a partial decay width of about 1 MeV. As a result, if discovered, it will serve as a highly nontrivial check on the nature of the many exotic hadrons discovered so far and on non-perturbative QCD as well. Assuming heavy quark spin symmetry, the same formalism is applied to study the $Dbar{D}^*K$ system, which is shown to also bind with quantum numbers $I(J^P)=frac{1}{2}(1^-)$ and a binding energy of $B_3(Dbar{D}^*K)simeq 77.3^{+3.1}_{-6.6}$ MeV, consistent with the results of previous works.","PeriodicalId":8457,"journal":{"name":"arXiv: High Energy Physics - Phenomenology","volume":"58 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79866059","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-12-02DOI: 10.1103/PHYSREVD.103.014027
J. L. Gutiérrez Santiago, G. López Castro, P. Roig
We study the $tau^- to nu_{tau} pi^{-}pi^{0}ell^{+}ell^{-}$ ($ell=e,,mu$) decays, which are $O(alpha^2)$-suppressed with respect to the dominant di-pion tau decay channel. Both the inner-bremsstrahlung and the structure- (and model-)dependent contributions are considered. In the $ell=e$ case, structure-dependent effects are $mathcal{O}(1%)$ in the decay rate, yielding a clean prediction of its branching ratio, $2.3times10^{-5}$, measurable with BaBar or Belle(-II) data. For $ell=mu$, both contributions have similar magnitude and we get a branching fraction of $(1.6pm0.3)times10^{-7}$, reachable by the end of Belle-II operation. These decays allow to study the dynamics of strong interactions with simultaneous weak and electromagnetic probes; their knowledge will contribute to reducing backgrounds in lepton flavor/number violating searches.
我们研究了$tau^- to nu_{tau} pi^{-}pi^{0}ell^{+}ell^{-}$ ($ell=e,,mu$)衰变，它相对于占主导地位的双介子tau衰变通道是$O(alpha^2)$抑制的。考虑了内部轫致效应和结构(和模型)相关的贡献。在$ell=e$的情况下，结构依赖效应在衰变率中为$mathcal{O}(1%)$，从而产生分支比的清晰预测$2.3times10^{-5}$，可以用BaBar或Belle(-II)数据测量。对于$ell=mu$，两个贡献具有相似的大小，我们得到了$(1.6pm0.3)times10^{-7}$的分支分数，在Belle-II操作结束时可以到达。这些衰减允许研究同时与弱探针和电磁探针强相互作用的动力学;他们的知识将有助于减少轻子口味/数量违反搜索的背景。
{"title":"Lepton-pair production in dipion \u0000τ\u0000 lepton decays","authors":"J. L. Gutiérrez Santiago, G. López Castro, P. Roig","doi":"10.1103/PHYSREVD.103.014027","DOIUrl":"https://doi.org/10.1103/PHYSREVD.103.014027","url":null,"abstract":"We study the $tau^- to nu_{tau} pi^{-}pi^{0}ell^{+}ell^{-}$ ($ell=e,,mu$) decays, which are $O(alpha^2)$-suppressed with respect to the dominant di-pion tau decay channel. Both the inner-bremsstrahlung and the structure- (and model-)dependent contributions are considered. In the $ell=e$ case, structure-dependent effects are $mathcal{O}(1%)$ in the decay rate, yielding a clean prediction of its branching ratio, $2.3times10^{-5}$, measurable with BaBar or Belle(-II) data. For $ell=mu$, both contributions have similar magnitude and we get a branching fraction of $(1.6pm0.3)times10^{-7}$, reachable by the end of Belle-II operation. These decays allow to study the dynamics of strong interactions with simultaneous weak and electromagnetic probes; their knowledge will contribute to reducing backgrounds in lepton flavor/number violating searches.","PeriodicalId":8457,"journal":{"name":"arXiv: High Energy Physics - Phenomenology","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87145030","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The possibility to use the exclusive $pp to pp phi$ and $pp to pp phi phi$ reactions in identifying the odderon exchange is discussed. So far there is no unambiguous experimental evidence for the odderon, the charge conjugation $C = -1$ counterpart of the $C = +1$ pomeron. Recently proposed tensor-pomeron and vector-odderon model for soft high-energy reactions is applied. For the $p p to p p phi$ reaction at high energies the photon-pomeron fusion is the dominant process and the odderon-pomeron fusion is an interesting alternative. Adding odderon exchange improves considerably description of the proton-proton angular correlations measured by the WA102 collaboration. The $p p to p p phi phi$ process via pomeron-pomeron fusion is advantageous one as here the odderon does not couple to protons. The observation of large $M_{phi phi}$ and the rapidity difference $Y_{phi phi}$ seems well suited to identify odderon exchange. Comparisons with data from the WA102 experiment are made and predictions for LHC experiments are given.
讨论了利用排他性的$pp to pp phi$和$pp to pp phi phi$反应来识别奇德龙交换的可能性。到目前为止，还没有明确的实验证据证明奥德龙是C = -1和C = +1的共轭波美子。应用了最近提出的软高能反应的张量-pomeron和矢量-odderon模型。对于高能的p p 到p p $反应，光子-玻色子聚变是主要的过程，而奇德子-玻色子聚变是一个有趣的选择。加入odderon交换可以显著改善WA102协作测量的质子-质子角相关的描述。通过pomeron-pomeron聚变的p p 到p p $过程是有利的，因为在这里奇数子不与质子偶联。观察到较大的$M_{phi phi}$和快速差$Y_{phi phi}$似乎很适合于识别odderon交换。与WA102实验数据进行了比较，并对LHC实验进行了预测。
{"title":"Searching for odderon exchange in exclusive $pp to pp phi$ and $pp to pp phi phi$ reactions at the LHC","authors":"P. Lebiedowicz, O. Nachtmann, A. Szczurek","doi":"10.22323/1.390.0477","DOIUrl":"https://doi.org/10.22323/1.390.0477","url":null,"abstract":"The possibility to use the exclusive $pp to pp phi$ and $pp to pp phi phi$ reactions in identifying the odderon exchange is discussed. So far there is no unambiguous experimental evidence for the odderon, the charge conjugation $C = -1$ counterpart of the $C = +1$ pomeron. Recently proposed tensor-pomeron and vector-odderon model for soft high-energy reactions is applied. For the $p p to p p phi$ reaction at high energies the photon-pomeron fusion is the dominant process and the odderon-pomeron fusion is an interesting alternative. Adding odderon exchange improves considerably description of the proton-proton angular correlations measured by the WA102 collaboration. The $p p to p p phi phi$ process via pomeron-pomeron fusion is advantageous one as here the odderon does not couple to protons. The observation of large $M_{phi phi}$ and the rapidity difference $Y_{phi phi}$ seems well suited to identify odderon exchange. Comparisons with data from the WA102 experiment are made and predictions for LHC experiments are given.","PeriodicalId":8457,"journal":{"name":"arXiv: High Energy Physics - Phenomenology","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91035841","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-12-01DOI: 10.1103/PHYSREVB.103.165120
B.A.S.D. Chrispim, Rodrigo C. L. Bruni, Guimarães
The theory of massive photons in the presence of axions is studied as the effective theory describing the electromagnetic response of semimetals when a particular quartic fermionic pairing perturbation triggers the formation of charged chiral condensates, giving rise to an axionic superconductor. We investigate corrections to the Yukawa-like potential mediated by massive photons due to axion excitations up to one-loop order and compute the modifications of the London penetration length.
{"title":"Massive photon propagator in the presence of axionic fluctuations","authors":"B.A.S.D. Chrispim, Rodrigo C. L. Bruni, Guimarães","doi":"10.1103/PHYSREVB.103.165120","DOIUrl":"https://doi.org/10.1103/PHYSREVB.103.165120","url":null,"abstract":"The theory of massive photons in the presence of axions is studied as the effective theory describing the electromagnetic response of semimetals when a particular quartic fermionic pairing perturbation triggers the formation of charged chiral condensates, giving rise to an axionic superconductor. We investigate corrections to the Yukawa-like potential mediated by massive photons due to axion excitations up to one-loop order and compute the modifications of the London penetration length.","PeriodicalId":8457,"journal":{"name":"arXiv: High Energy Physics - Phenomenology","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79283088","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-11-30DOI: 10.1103/PhysRevD.103.095017
Taisuke Katayose, S. Matsumoto, S. Shirai
Electroweakly Interacting Massive Particles (EWIMPs), in other words, new massive particles that are charged under the electroweak interaction of the Standard Model (SM), are often predicted in various new physics models. EWIMPs are probed at hadron collider experiments not only by observing their direct productions but also by measuring their quantum effects on Drell-Yan processes for SM lepton pair productions. Such effects are known to be enhanced especially when the di-lepton invariant mass of the final state is close to the EWIMP threshold, namely twice the EWIMP mass. In such a mass region, however, we have to carefully take non-perturbative effects into account, because the EWIMPs become non-relativistic and the prediction may be significantly affected by e.g., bound states of the EWIMPs caused by the electroweak interaction. We study such non-perturbative effects using the non-relativistic effective field theory of the EWIMPs, and found that those indeed affect the differential cross section of the Drell-Yan processes significantly, though the effects are smeared due to the finite energy resolution of the lepton measurement at the Large Hadron Collider experiment.
{"title":"Nonperturbative effects on electroweakly interacting massive particles at hadron collider","authors":"Taisuke Katayose, S. Matsumoto, S. Shirai","doi":"10.1103/PhysRevD.103.095017","DOIUrl":"https://doi.org/10.1103/PhysRevD.103.095017","url":null,"abstract":"Electroweakly Interacting Massive Particles (EWIMPs), in other words, new massive particles that are charged under the electroweak interaction of the Standard Model (SM), are often predicted in various new physics models. EWIMPs are probed at hadron collider experiments not only by observing their direct productions but also by measuring their quantum effects on Drell-Yan processes for SM lepton pair productions. Such effects are known to be enhanced especially when the di-lepton invariant mass of the final state is close to the EWIMP threshold, namely twice the EWIMP mass. In such a mass region, however, we have to carefully take non-perturbative effects into account, because the EWIMPs become non-relativistic and the prediction may be significantly affected by e.g., bound states of the EWIMPs caused by the electroweak interaction. We study such non-perturbative effects using the non-relativistic effective field theory of the EWIMPs, and found that those indeed affect the differential cross section of the Drell-Yan processes significantly, though the effects are smeared due to the finite energy resolution of the lepton measurement at the Large Hadron Collider experiment.","PeriodicalId":8457,"journal":{"name":"arXiv: High Energy Physics - Phenomenology","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81006498","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-11-27DOI: 10.1016/J.PHYSLETB.2021.136066
E. Ma
{"title":"Gauged baryon number and dibaryonic dark matter","authors":"E. Ma","doi":"10.1016/J.PHYSLETB.2021.136066","DOIUrl":"https://doi.org/10.1016/J.PHYSLETB.2021.136066","url":null,"abstract":"","PeriodicalId":8457,"journal":{"name":"arXiv: High Energy Physics - Phenomenology","volume":"38 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74834769","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-11-27DOI: 10.1103/PhysRevD.103.116012
M. Adzhymambetov, S. V. Akkelin, Y. Sinyukov
Two-particle momentum correlations of $N$ identical bosons are studied in the quantum canonical ensemble. We define the latter as properly selected sub-ensemble of events associated with the grand canonical ensemble which is characterized by a constant temperature and a harmonic-trap chemical potential. The merits of this toy-model are that it can be solved exactly, and that it demonstrates some interesting features revealed recently in small systems created in $p+p$ collisions at the LHC. We find that partial coherence can be observed in particles emission from completely thermal ensemble of events if instead of inclusive measurements one studies the two-boson distribution functions related to the events with particle numbers selected in some fixed multiplicity bins. The corresponding coherence effects increase with the multiplicity.
{"title":"Bose-Einstein momentum correlations at fixed multiplicities: Lessons from an exactly solvable thermal model for \u0000pp\u0000 collisions at the LHC","authors":"M. Adzhymambetov, S. V. Akkelin, Y. Sinyukov","doi":"10.1103/PhysRevD.103.116012","DOIUrl":"https://doi.org/10.1103/PhysRevD.103.116012","url":null,"abstract":"Two-particle momentum correlations of $N$ identical bosons are studied in the quantum canonical ensemble. We define the latter as properly selected sub-ensemble of events associated with the grand canonical ensemble which is characterized by a constant temperature and a harmonic-trap chemical potential. The merits of this toy-model are that it can be solved exactly, and that it demonstrates some interesting features revealed recently in small systems created in $p+p$ collisions at the LHC. We find that partial coherence can be observed in particles emission from completely thermal ensemble of events if instead of inclusive measurements one studies the two-boson distribution functions related to the events with particle numbers selected in some fixed multiplicity bins. The corresponding coherence effects increase with the multiplicity.","PeriodicalId":8457,"journal":{"name":"arXiv: High Energy Physics - Phenomenology","volume":"27 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77290925","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-11-26DOI: 10.1103/PHYSREVD.103.074024
Rajeev Singh, G. Sophys, R. Ryblewski
Evolution of spin polarization in the Gubser-expanding conformal perfect-fluid hydrodynamic background is studied. The analysis of the conformal transformation properties of the conservation laws is extended to the case of the angular momentum conservation. The explicit forms of equations of motion for spin components are derived and analysed, and some special solutions are found.
{"title":"Spin polarization dynamics in the Gubser-expanding background","authors":"Rajeev Singh, G. Sophys, R. Ryblewski","doi":"10.1103/PHYSREVD.103.074024","DOIUrl":"https://doi.org/10.1103/PHYSREVD.103.074024","url":null,"abstract":"Evolution of spin polarization in the Gubser-expanding conformal perfect-fluid hydrodynamic background is studied. The analysis of the conformal transformation properties of the conservation laws is extended to the case of the angular momentum conservation. The explicit forms of equations of motion for spin components are derived and analysed, and some special solutions are found.","PeriodicalId":8457,"journal":{"name":"arXiv: High Energy Physics - Phenomenology","volume":"20 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90335093","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-11-26DOI: 10.1146/annurev-nucl-102419-060007
D. d’Enterria, C. Loizides
We review the theoretical and experimental progress in the Glauber model of multiple nucleon and/or parton scatterings, after the last 10--15 years of operation with proton and nuclear beams at the CERN Large Hadron Collider (LHC) and with various light and heavy colliding ions at the BNL Relativistic Heavy Ion Collider (RHIC). The main developments and the state-of-the-art of the field are summarized. These encompass measurements of the inclusive inelastic proton and nuclear cross sections, advances in the description of the proton and nuclear density profiles and their fluctuations, inclusion of subnucleonic degrees of freedom, experimental procedures and issues related to the determination of the collision centrality, validation of the binary scaling prescription for hard scattering cross sections, and constraints on transport properties of quark-gluon matter from varying initial-state conditions in relativistic hydrodynamics calculations. These advances confirm the validity and usefulness of the Glauber formalism for quantitative studies of QCD matter produced in collisions of systems, from protons to uranium, of vastly different size.
{"title":"Progress in the Glauber Model at Collider Energies","authors":"D. d’Enterria, C. Loizides","doi":"10.1146/annurev-nucl-102419-060007","DOIUrl":"https://doi.org/10.1146/annurev-nucl-102419-060007","url":null,"abstract":"We review the theoretical and experimental progress in the Glauber model of multiple nucleon and/or parton scatterings, after the last 10--15 years of operation with proton and nuclear beams at the CERN Large Hadron Collider (LHC) and with various light and heavy colliding ions at the BNL Relativistic Heavy Ion Collider (RHIC). The main developments and the state-of-the-art of the field are summarized. These encompass measurements of the inclusive inelastic proton and nuclear cross sections, advances in the description of the proton and nuclear density profiles and their fluctuations, inclusion of subnucleonic degrees of freedom, experimental procedures and issues related to the determination of the collision centrality, validation of the binary scaling prescription for hard scattering cross sections, and constraints on transport properties of quark-gluon matter from varying initial-state conditions in relativistic hydrodynamics calculations. These advances confirm the validity and usefulness of the Glauber formalism for quantitative studies of QCD matter produced in collisions of systems, from protons to uranium, of vastly different size.","PeriodicalId":8457,"journal":{"name":"arXiv: High Energy Physics - Phenomenology","volume":"39 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90899361","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-11-26DOI: 10.1103/PHYSREVD.103.074013
Y. Hagiwara, Cheng Zhang, Jian Zhou, Ya-jin Zhou
We study exclusive $pi^+ pi^-$ pair production near $rho^0$ resonance peak in ultraperipheral heavy ion collisions. Pion pair can either be produced via two photon fusion process or from the decay of $rho^0$ in photon-nuclear reaction. At very low pair transverse momentum, the electromagnetic and nuclear amplitudes become comparable. We show that the Coulomb nuclear interference amplitude gives rise to sizable $cos phi$ and $cos 3phi$ azimuthal asymmetries, which can be used to constrain the phase of the dipole-nucleus scattering amplitude.
{"title":"Coulomb nuclear interference effect in dipion production in ultraperipheral heavy ion collisions","authors":"Y. Hagiwara, Cheng Zhang, Jian Zhou, Ya-jin Zhou","doi":"10.1103/PHYSREVD.103.074013","DOIUrl":"https://doi.org/10.1103/PHYSREVD.103.074013","url":null,"abstract":"We study exclusive $pi^+ pi^-$ pair production near $rho^0$ resonance peak in ultraperipheral heavy ion collisions. Pion pair can either be produced via two photon fusion process or from the decay of $rho^0$ in photon-nuclear reaction. At very low pair transverse momentum, the electromagnetic and nuclear amplitudes become comparable. We show that the Coulomb nuclear interference amplitude gives rise to sizable $cos phi$ and $cos 3phi$ azimuthal asymmetries, which can be used to constrain the phase of the dipole-nucleus scattering amplitude.","PeriodicalId":8457,"journal":{"name":"arXiv: High Energy Physics - Phenomenology","volume":"159 32 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77816562","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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