LHC constraints and prospects for S1 scalar leptoquark explaining the (B)over-bar → D(*) τ(ν)over-bar anomaly

被引：68

作者：

Dumont, Beranger ^{[1
]}

Nishiwaki, Kenji ^{[2
]}

Watanabe, Ryoutaro ^{[1
]}

机构：

[1] Inst for Basic Sci Korea, Ctr Theoret Phys Universe, Daejeon 305811, South Korea

[2] Korea Inst Adv Study, Sch Phys, Seoul 02455, South Korea

来源：

PHYSICAL REVIEW D | 2016年 / 94卷 / 03期

关键词：

R-K; PARTON DISTRIBUTIONS; PAIR PRODUCTION; SEARCH; RD(ASTERISK); EXPLANATION; COLLISIONS;

D O I：

10.1103/PhysRevD.94.034001

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Recently, deviations in flavor observables of (B) over bar -> D-(*)tau(nu) over bar have been shown between the predictions in the Standard Model and the experimental results reported by BABAR, Belle, and LHCb collaborations. One of the solutions to this anomaly is obtained in a class of leptoquark model with a scalar leptoquark boson S-1, which is a SU(3)(c) triplet and SU(2)(L) singlet particle with -1/3 hypercharge interacting with a quark-lepton pair. With well-adjusted couplings, this model can explain the anomaly and be compatible with all flavor constraints. In such a case, the S-1 boson can be pair-produced at CERN's Large Hadron Collider (LHC) and subsequently decay as S-1* -> t tau, b nu, and c tau. This paper explores the current 8 and 13 TeV constraints, as well as the detailed prospects at 14 TeV, of this flavor-motivated S-1 model. From the current available 8 and 13 TeV LHC searches, we obtain constraints on the S-1 boson mass for M-S1 < 400-640 GeV depending on values of the leptoquark couplings to fermions. Then we study future prospects for this scenario at the 14 TeV LHC using detailed cut analyses and evaluate exclusion and discovery potentials for the flavor- motivated S-1 leptoquark model from searches for the (b nu) (<(b)over bar>(nu) over bar) and (c tau) ((c) over bar(tau) over bar) final states. In the latter case, we consider several scenarios for the identification of charm jets. As a result, we find that the S-1 leptoquark origin of the (B) over bar -> D-(*) tau(nu) over bar anomaly can be probed with M-S1 less than or similar to 600/800 GeV at the 14 TeV LHC with L = 300/3000 fb(-1) of accumulated data. One can also see that the 14 TeV LHC run II with L = 300 fb(-1) can exclude the S-1 leptoquark boson up to M-S1 similar to 0.8 TeV at 95% confidence level, whereas a future 14 TeV LHC with L = 3000 fb(-1) data has a potential to discover the S-1 leptoquark boson with its mass up to M-S1 similar to 1.1 TeV with over 5 sigma significance, from the (b nu) ((b) over bar(nu) over bar) and/or (c tau) ((c) over bar(tau) over bar) searches.

引用

页数：21

共 100 条

[1] Search for scalar leptoquarks in pp collisions at √s=13TeV with the ATLAS experiment [J].

Aaboud, M. ;

Aad, G. ;

Abbott, B. ;

Abdallah, J. ;

Abdinov, O. ;

Abeloos, B. ;

Aben, R. ;

AbouZeid, O. S. ;

Abraham, N. L. ;

Abramowicz, H. ;

Abreu, H. ;

Abreu, R. ;

Abulaitia, Y. ;

Acharya, B. S. ;

Adamczyk, L. ;

Adams, D. L. ;

Adelman, J. ;

Adomeit, S. ;

Adye, T. ;

Affolder, A. A. ;

Agatonovic-Jovin, T. ;

Agricola, J. ;

Aguilar-Saavedra, J. A. ;

Ahlen, S. P. ;

Ahmadov, F. ;

Aielli, G. ;

Akerstedt, H. ;

Akesson, T. P. A. ;

Akimov, A. V. ;

Alberghi, G. L. ;

Albert, J. ;

Albrand, S. ;

Alconada Verzini, M. J. ;

Aleksa, M. ;

Aleksandrov, I. N. ;

Alexa, C. ;

Alexander, G. ;

Alexopoulos, T. ;

Alhroob, M. ;

Aliev, M. ;

Alimonti, G. ;

Alison, J. ;

Alkire, S. P. ;

Allbrooke, B. M. M. ;

Allen, B. W. ;

Allport, P. P. ;

Aloisio, A. ;

Alonso, A. ;

Alonso, F. ;

Alpigiani, C. .

NEW JOURNAL OF PHYSICS, 2016, 18 :1-25

[2]

Aad G, 2016, EUR PHYS J C, V76, DOI 10.1140/epjc/s10052-015-3823-9

[3] Search for Scalar Charm Quark Pair Production in pp Collisions at √s=8 TeV with the ATLAS Detector [J].

Aad, G. ;

Abbott, B. ;

Abdallah, J. ;

Khalek, S. Abdel ;

Abdinov, O. ;

Aben, R. ;

Abi, B. ;

Abolins, M. ;

AbouZeid, O. S. ;

Abramowicz, H. ;

Abreu, H. ;

Abreu, R. ;

Abulaiti, Y. ;

Acharya, B. S. ;

Adamczyk, L. ;

Adams, D. L. ;

Adelman, J. ;

Adomeit, S. ;

Adye, T. ;

Agatonovic-Jovin, T. ;

Aguilar-Saavedra, J. A. ;

Agustoni, M. ;

Ahlen, S. P. ;

Ahmadov, F. ;

Aielli, G. ;

Akerstedt, H. ;

Akesson, T. P. A. ;

Akimoto, G. ;

Akimov, A. V. ;

Alberghi, G. L. ;

Albert, J. ;

Albrand, S. ;

Alconada Verzini, M. J. ;

Aleksa, M. ;

Aleksandrov, I. N. ;

Alexa, C. ;

Alexander, G. ;

Alexandre, G. ;

Alexopoulos, T. ;

Alhroob, M. ;

Alimonti, G. ;

Alio, L. ;

Alison, J. ;

Allbrooke, B. M. M. ;

Allison, L. J. ;

Allport, P. P. ;

Aloisio, A. ;

Alonso, A. ;

Alonso, F. ;

Alpigiani, C. .

PHYSICAL REVIEW LETTERS, 2015, 114 (16)

[4]

Aad G, 2013, J HIGH ENERGY PHYS, DOI 10.1007/JHEP10(2013)189

[5] Search for pair production of second generation scalar leptoquarks [J].

Abazov, V. M. ;

Abbott, B. ;

Abolins, M. ;

Acharya, B. S. ;

Adams, M. ;

Adams, T. ;

Aguilo, E. ;

Ahsan, M. ;

Alexeev, G. D. ;

Alkhazov, G. ;

Alton, A. ;

Alverson, G. ;

Alves, G. A. ;

Anastasoaie, M. ;

Ancu, L. S. ;

Andeen, T. ;

Andrieu, B. ;

Anzelc, M. S. ;

Aoki, M. ;

Arnoud, Y. ;

Arov, M. ;

Arthaud, M. ;

Askew, A. ;

Asman, B. ;

Jesus, A. C. S. Assis ;

Atramentov, O. ;

Avila, C. ;

Badaud, F. ;

Bagby, L. ;

Baldin, B. ;

Bandurin, D. V. ;

Banerjee, P. ;

Banerjee, S. ;

Barberis, E. ;

Barfuss, A. -F. ;

Bargassa, P. ;

Baringer, P. ;

Barreto, J. ;

Bartlett, J. F. ;

Bassler, U. ;

Bauer, D. ;

Beale, S. ;

Bean, A. ;

Begalli, M. ;

Begel, M. ;

Belanger-Champagne, C. ;

Bellantoni, L. ;

Bellavance, A. ;

Benitez, J. A. ;

Beri, S. B. .

PHYSICS LETTERS B, 2009, 671 (02) :224-232

[6]

Adachi I., P 24 INT S LEPT PHOT

[7] FEYNRULES 2.0-A complete toolbox for tree-level phenomenology [J].

Alloul, Adam ;

Christensen, Neil D. ;

Degrande, Celine ;

Duhr, Claude ;

Fuks, Benjamin .

COMPUTER PHYSICS COMMUNICATIONS, 2014, 185 (08) :2250-2300

[8] Comparative study of various algorithms for the merging of parton showers and matrix elements in hadronic collisions [J].

Alwall, J. ;

Hoche, S. ;

Krauss, F. ;

Lavesson, N. ;

Lonnblad, L. ;

Maltoni, F. ;

Mangano, M. L. ;

Moretti, M. ;

Papadopoulos, C. G. ;

Piccinini, F. ;

Schumann, S. ;

Treccani, M. ;

Winter, J. ;

Worek, M. .

EUROPEAN PHYSICAL JOURNAL C, 2008, 53 (03) :473-500

[9] The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations [J].

Alwall, J. ;

Frederix, R. ;

Frixione, S. ;

Hirschi, V. ;

Maltoni, F. ;

Mattelaer, O. ;

Shao, H. -S. ;

Stelzer, T. ;

Torrielli, P. ;

Zaro, M. .

JOURNAL OF HIGH ENERGY PHYSICS, 2014, (07)

[10] MadGraph 5: going beyond [J].

Alwall, Johan ;

Herquet, Michel ;

Maltoni, Fabio ;

Mattelaer, Olivier ;

Stelzer, Tim .

JOURNAL OF HIGH ENERGY PHYSICS, 2011, (06)

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